Alvyra Slepetiene - Profile on Academia.edu (original) (raw)

Papers by Alvyra Slepetiene

Geoderma, 2006

Large archive databases of soil organic matter (SOM) widely exist in Lithuania and the other coun... more Large archive databases of soil organic matter (SOM) widely exist in Lithuania and the other countries of Central and Eastern Europe. Despite the demise of the former Soviet Union over 16 years ago, and Lithuania's integration as a full European Union state, difficulties of SOM data acceptance remain where these results are presented for publication in international journals, due to methodological differences between laboratory protocols. Therefore, the scientific pilot project 'Carbon sequestration in Lithuanian soils', supported by the Leverhulme Trust (U.K.), included an objective to correlate soil carbon methodologies, using Lithuanian Eutric Albeluvisols. A comparison of SOM content data acquired using five different analytical methods is reported. The research programme included a specific objective to correlate analytical methods for SOM analyses. A total of 92 Eutric Albeluvisol samples were collected from topsoil (0-0.2 m: Ap, n = 36; Ah, n = 10) and subsoil (0.2-0.4 m: Bt, n = 46) horizons of 46 long-term experimental field plots at the Kaltinenai Research Station of the Lithuanian Institute of Agriculture. Each sample was then subsampled and analysed for SOM using dry combustion (by automatic elemental analyser), Walkley-Black (USDA), Tyurin photometrical, Tyurin titrimetrical and loss-on-ignition (LoI) methods (the later performed, in parallel, in both Lithuania and U.K. laboratories). Linear correlation and paired regression equations were calculated. Correlation coefficients between the sets of results varied between r = 0.81-0.96 (from 0-0.2 m, n = 46, P < 0.001) and r = 0.76-0.98 (from 0.2-0.4 m, n = 46, P < 0.001). Based on the strength and significance of these relationships, it is proposed that simple linear or more complex paired regression equations can be confidently employed to recalculate SOM data between various analytical methodologies. Future work will continue these investigations on other soil units and environments, hereby enhancing the database.

Zemdirbyste

Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station ... more Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station of the Lithuanian Institute of Agriculture on the undulating topography of Western Lithuania. Results from 18-years of field investigations show significant increases in soil organic matter (SOM) content under grass-grain crop rotations compared with field and graingrass crop rotations, which thus provides evidence for carbon sequestration in soil. SOM content was analysed using the Tyurin titrimetric method, which is not widely used in Western Countries. Therefore, SOM data are also presented after split analysis using dry combustion, Walkley-Black (USDA) and loss-on-ignition (UK) methods, enabling the calculation of transfer functions between databases. International comparison of SOM databases assists many tasks, which include evaluating the importance of SOM/SOC in international collaborative terrestrial ecosystem studies, the development of effective soil conservation policies and the creation of a sustainable future for the modern Lithuanian rural society.

Field case studies of soil organic matter sequestration in Lithuania and the UK

International Journal of Design & Nature and Ecodynamics, 2008

ABSTRACT

The productivity and energy potential of alfalfa, fodder galega and maize plants under the conditions of the nemoral zone

Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2015

Application of environmental protection measures for clay loam Cambisol used for agricultural purposes

Journal of Environmental Engineering and Landscape Management, 2011

Field experiments were done at the Joniškėlis Experimental Station of the Lithuanian Institute of... more Field experiments were done at the Joniškėlis Experimental Station of the Lithuanian Institute of Agriculture (LIA) during 2004–2006. The experiments were done on a productive clay loam Gleyic Cambisol used for agricultural production and were designed to estimate the effects of various catch crops—red clover (Trifolium pratense L.) and white clover (Trifolium repens L.) mixture with Italian ryegrass (Lolium multiflorum

Zemdirbyste-Agriculture, 2015

Nowadays the priority in agriculture is given to the soil tillage systems which enable reduction ... more Nowadays the priority in agriculture is given to the soil tillage systems which enable reduction of organic matter decomposition. Our investigation was aimed to assess the long-term impact of reduced intensity tillage systems, straw and green manure combinations on soil organic matter quantity and quality. Since 1999, a long-term field experiment has been done at the Experimental Station of Aleksandras Stulginskis University (former Lithuanian University of Agriculture) at 54º52′50′′ N latitude and 23º49′41′′ E longitude. The results presented in this paper were obtained in the 12 th and 14 th years of investigations. The soil of the experimental site is Epieutric Endocalcaric Endogleyic Planosol. Continuous long-term (12 and 14 years) straw application increased soil organic carbon (SOC) content by 9.3% and 12.0% compared with the plots without straw. Reduced tillage systems without primary tillage (shallow rotovating before sowing, catch cropping for green manure with rotovating, no-tillage) were even more effective. Compared with conventional ploughing, SOC increased by 19.4% to 33.9%. These tillage systems increased soil quality too, since SOC stratification ratio between 0-10 and 10-20 cm layers increased by 1.14 till 1.21. Reduced tillage systems with primary tillage (shallow ploughing and shallow loosening) had no effect both on SOC and stratification process in the soil. SOC pools over the experimental years tended to increase by 9.3% and 11.6% in the treatments of long-term application of straw compared with the plots without straw. Notillage and catch cropping for green manure with rotovating compared with conventional ploughing significantly increased the pools of organic carbon by 31.7% to 33.3% in the plots without straw and by 28.9% to 32.7% in the plots with straw. Continuous straw application increased the quantity of mobile humus substances by 22.7% compared to the plots without straw. Straw in combination with catch crop for green manure incorporation and rotovating and no-tillage increased mobile humus substances by 53.2% and 58.8% compared with conventional ploughing. Only long-term application of straw increased the quantity of mobile humic acids by 40.6% compared with the plots without straw. The rate of mobile humic acids from total amount of mobile humus substances in the treatments without straw amounted to 39.8%, while with straw this content increased to 45.6%. Reduced tillage systems without primary tillage had no significant effect on mobile humic acids but tended to increase soil organic matter quality.

Sieros trąšų įtaka vasarinių rapsų sėklų derliui ir kokybei

Žemės ūkio mokslai, 2013

Žemės ūkio mokslai, 2014

Lietuvos agrarinių ir miškų mokslų centras, Instituto al. 1, LT-58344 Akademija, Kėdainių r. El. ... more Lietuvos agrarinių ir miškų mokslų centras, Instituto al. 1, LT-58344 Akademija, Kėdainių r. El. paštas: ruta@alteja.lt; alvyra@lzi.lt Lietuvos agrarinių ir miškų mokslų centro filiale, Agrocheminių tyrimų laborato� rijos vegetacinių bandymų aikštelėje, 2010-2012 m. buvo atlikti du vegetaciniai bandymai. Bandymams įrengti buvo atvežti du skirtingi dirvožemiai. Pirma� sis -smėlingas lengvo priemolio, sekliai karbonatingas, giliau glėjiškas rudžemis (Epicalcari -Endohypogleyic Cambisol), atvežtas iš Radviliškio r., Skėmių bandymų lauko. Antrasis -smėlingas priemolio tipingas paprastasis išplautžemis (Haplic Luvisol), atvežtas iš Varėnos r., Perlojos bandymų lauko. Vegetaciniuose induose auginta vasarinių kviečių veislė 'Triso' , tręšta tokiomis sieros normomis: netręšta (kontrolė), S 20 , S 40 , S 60 . Vidutiniais tyrimų duomenimis, karbonatinga� Vidutiniais tyrimų duomenimis, karbonatinga� me rudžemyje ir paprastajame išplautžemyje sieros trąšos turėjo esminės įtakos vasarinių kviečių grūdų derliaus padidėjimui, didžiausias derlius gautas tręšiant S 60 trąšų norma, o didesnis sieros trąšų efektyvumas derliui nustatytas vasarinius kviečius auginant karbonatingame rudžemyje. Žalių baltymų kiekis esmingai di� desnis karbonatingame rudžemyje gautas tręšiant S 20 trąšų norma, o paprastajame išplautžemyje -S 20 ir S 60 . Vidutiniais duomenimis, abiejuose bandymuose sieros trąšos neturėjo esminės įtakos krakmolo kiekiui kviečių grūduose, tačiau turėjo tendenciją didinti sausojo glitimo kiekį. Raktažodžiai: dirvožemis, siera, vasariniai kviečiai, baltymai, glitimas ĮVADAS Nors vasariniai kviečiai ir nėra labai reiklūs sie rai, tačiau pastaraisiais metais Vakarų Europoje pa stebimas jos trūkumas. Esant sieros trūkumui už auginamas mažesnis ir prastesnės kokybės va sa rinių kviečių derlius (Wrigley, Du Cros, Fulling ton, Kasarda, 1��4� Castle, �andall, 1��7� Full , 1��4� Castle, �andall, 1��7� Full ington, Miskelly, Wrigley, Kasandra, 1��7). Sieros kiekio svyravimai dirvožemyje gali neigiamai veikti kviečių kokybę ir sunkinti kviečių malimo bei duo nos kepimo procesus. Kai trūksta grūduose sieros ir iš jų gaminama duona, tešla būna prasčiau minko ma. Subalansuotas tręšimas siera užtikrintų gausų ir kokybišką derlių (Moss, Wrigley, Mac�itc�ie, �an , Wrigley, Mac�itc�ie, �an dall, 1��3� Z�ao, Hawkesford, McGrat�, 1���).

Forest, 2008

One of the main objectives of this work was to study the effects of land use on soil carbon, tota... more One of the main objectives of this work was to study the effects of land use on soil carbon, total and extractable SOM and the properties of humic substances. Soil samples were collected in western and central Lithuania and represented Albeluvisol and Cambisol. Total C contents as well as C / N in the soil samples were determined by a dry combustion method using an automatic Vario EL III analyzer. Extractable SOM was measured using sodium pyrophosphate solution and hot water for the extraction procedure. Humic acids were investigated by the methods of gel permeation chromatography and absorption spectroscopy in UV / VIS and IR regions. Experimental evidence suggests that land use conversion had both positive and negative effects on soil total and extractable carbon and SOM. In Albeluvisols, grassland soil was found to contain by 0.2-0.6 g kg -1 more C compared to fallow land (1-1.5 years old). In Cambisols, long-term pasture soil was found to contain by 2.4 g kg -1 more C compared to arable land (16 years) converted from pasture. Results of humic acid analyses by gel chromatography showed a high molecular weight and polydispersity of humic acids. The highest content of humic acids in HWE as well as a high content (29%) of macromolecules with the molecular weight more than 100,000, and the lowest C / N ratio (10.3) were determined in long-term pasture soil.

Zemdirbyste

Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station ... more Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station of the Lithuanian Institute of Agriculture on the undulating topography of Western Lithuania. Results from 18-years of field investigations show significant increases in soil organic matter (SOM) content under grass-grain crop rotations compared with field and graingrass crop rotations, which thus provides evidence for carbon sequestration in soil. SOM content was analysed using the Tyurin titrimetric method, which is not widely used in Western Countries. Therefore, SOM data are also presented after split analysis using dry combustion, Walkley-Black (USDA) and loss-on-ignition (UK) methods, enabling the calculation of transfer functions between databases. International comparison of SOM databases assists many tasks, which include evaluating the importance of SOM/SOC in international collaborative terrestrial ecosystem studies, the development of effective soil conservation policies and the creation of a sustainable future for the modern Lithuanian rural society.

Soil carbon status of survived and restoring wood pasture in the protected area Natura 2000

Accumulation of carbon and macronutrients in soil cultivated with legumes under organic management

Evaluation of total, dissolved and humified carbon in a peat soil under re-naturalization

EURASIAN JOURNAL OF SOIL SCIENCE (EJSS), 2015

Tyrimu siekiama nustatyti, kaip renatūralizacijos metu kinta žemapelkės durpžemio PDž (Terric His... more Tyrimu siekiama nustatyti, kaip renatūralizacijos metu kinta žemapelkės durpžemio PDž (Terric Histosol, HSs) cheminė sudėtis. Išanalizuoti dirvožemio ėminiai paimti 2012 m. buvusioje Radviliškio bandymų stoties tyrimų vietoje (0-30 cm) trimis pakartojimais. Nustatyta, kad dėl skirtingo dirvožemio naudo jimo, dirbimo ir tręšimo Terric Histosol turėjo nevienodą kiekį C, N, K ir P. Skir tingai naudojamo žemapelkės durpžemio pH svyravo nuo 5,5 iki 7,5. Didžiausi C org , N, P bei judriųjų humuso ir huminių rūgščių kiekiai nustatyti žemapelkėje su nepašalintu durpių sluoksniu, palyginti su nukastos žemapelkės durpžemiu, naudotu skirtingoms žemės ūkio reikmėms. Dėl intensyvios mineralizacijos nenukastame durpiniame dirvožemyje nustatyta didžiausia P koncentracija bu vusiame sėjomainos lauke (0,17 %) ir nenaudojamoje žemapelkėje (0,16 %), kur nustatyta mažiau humuso ir huminių rūgščių. Tyrimų vietoje pastaruosius 12 metų vykstant renatūralizacijai tarp skirtingos žemėnaudos laukų yra pastebi mi dirvožemio cheminių savybių skirtumai. Jie yra tiesiogiai susiję su dirvožemio naudojimo žemės ūkio tikslams skirtumais.

Chemical properties of Pachiterric Histosol as influenced by different land use

Zemdirbyste-Agriculture, 2015

Journal of Food Agriculture and Environment

The accumulation of soil organic matter (SOM) content and composition of agrarian lands and prote... more The accumulation of soil organic matter (SOM) content and composition of agrarian lands and protected areas was assessed. The most SOM was accumulated in pre-mainland section of floodplain meadows of Nevėžis; this quantity exceeds more than 5 times SOM content in agrarian land grown with swards, and also was higher than SOM content of wood pasture. However, amount of SOM in surface soil layer (0–10 cm) of pre-mainland section was equal to 143.2 g kg -1 soil, in 10–20 cm layer – 81.4 g kg -1 soil, and in 20–30 cm layer – 30.9 g kg -1 soil. The most unfavorable status of SOM was determined in the soil of riverside section of floodplain of the Nevėžis River. It characterizes low concentrations of SOM – 14.6, 7.0, and 7.3 g kg -1 soil in the 0–10, 10–20 and 20–30 cm layers, respectively, and relative share of MHS accounted for as much as 47.8–57.9% of soil organic carbon.

Field and laboratory investigations were done at the Lithuanian Institute of Agriculture (LIA) an... more Field and laboratory investigations were done at the Lithuanian Institute of Agriculture (LIA) and Joniskelis Research Station of LIA, Lithuania. The aim of the study was to compare the soil organic carbon (SOC) as well as carbon of mobile humic acids (MHA) contents in the differently used agricultural soils. The data of SOC and MHA investigated in four different field experiments are discussed in this article. In the Experiment 1 the study investigated two soil tillage systems: conventional and sustainable (factor A) and crop rotations with different structure of winter crops (0−100%) (factor B) on a Endocalcari-Endohypogleyic Cambisol at the Joniskelis Research Station of LIA. The field Experiment 2 compared the influence of long-term legume swards on SOC and MHA in an Epicalcari-Endohypogleic Cambisol. In the Experiment 3 the treat-ments of factor A involved 7 different swards and the treatments of factor B of this experiment involved frequent and less frequent grazing. Five past...

Dirvožemio ėminiai surinkti ekspediciniu būdu Vakarų Žemaitijoje 2007 metų pavasarį. Pagrindinis ... more Dirvožemio ėminiai surinkti ekspediciniu būdu Vakarų Žemaitijoje 2007 metų pavasarį. Pagrindinis šių tyrimų tikslas -įvertinti dirvožemio anglies bei su ja susijusių elementų pokyčius, jų tarpusavio santykius, istoriškai skirtingai susiklosčiusiose žemėnaudose. Cheminėms analizėms dirvožemio mėginiai sumalti ultracentrifūginiu malūnu ZM 200 su 0,2 mm sietu. Anglies (C), azoto (N), sieros (S) kiekiai nustatyti naudojant automatinį analizatorių Vario EL III; Pspektrofotometriškai su Carry 50 (VARIAN, Vokietija). Dirvožemio organinė medžiaga perskaičiuota iš organinės anglies naudojant vidutinį koeficientą 1,724. Dirvožemio 0-30 cm sluoksnyje buvo nuo 1,312 iki 2,830 % C. Dirvožemio organinė medžiaga skirtingose žemėnaudose rasta nuo 2,05 % buvusios senos kaimavietės dabar agrariniams tikslams nenaudojamame dirvožemyje Paleičiuose iki 4,61-4,67 % sukultūrintame senos agrarinės būklės dirvožemyje Nikėlų kaime. Buvusios senos kaimavietės dirvožemyje nustatyta azoto (N) 0,093 %, o gerai sukultūrintame -0,189 %. Kaimavietės dirvožemyje C:N rodiklis buvo 14,1; vadinamosios jaunos agrarinės būklės teritorijoje Palendriuose -10,8-11,0; gerai sukultūrintame senos agrarizacijos dirvožemyje -14,7-15,0; brandžiame Kalniškės -Jurgaičių miške, esančiame greta sukultūrinto dirvožemio, -15,9; natūraliame neliestame Kūlinų miško dirvožemyje -22,9. Jaunos agrarizacijos teritorijų dirvožemiai pasižymėjo mažesniu C:N, negu ilgą laiką kultūrinami dirvožemiai. Iš esmės daugiau sieros buvo žemdirbystei naudojamuose dirvožemiuose, ypač senos agrarizacijos teritorijose, palyginus su natūraliais. Miško dirvožemyje N:S 0-30 cm sluoksnyje buvo 9,8; natūraliame dirvožemyje, kuriame sieros buvo labai mažai -15,5. C:S svyravo plačiose ribose: nuo 156 miške iki 219 dvidešimt penkerių metų sėtame žolyne ir 268 -natūraliame brandžiame miške. Agrarinėse žemėnaudose C:S rodiklis buvo iš esmės mažesnis, palyginus su natūraliomis. Fosforo (P) kiekis taip pat iš esmės skyrėsi natūraliame ir sukultūrintame dirvožemiuose. Mažiausias P kiekis buvo miško dirvožemyje (0,023-0,035 %), o sukultūrintame šis rodiklis buvo du kartus didesnis -0,070 %. Fosforo ir azoto dalis organinėje medžiagoje jaunos agrarizacijos teritorijos buvo pastebimai didesnė, negu senos agrarizacijos, o pati mažiausia -natūraliame miško dirvožemyje.

This book (in Lithuanian with English summary) presents scientific achievements of half a century... more This book (in Lithuanian with English summary) presents scientific achievements of half a century research carried out in Lithuania in one of the most important branches of agronomy science - agrochemistry. The book comprises 14 chapters. In the chapters 1 to 5 the importance of long-term studies is discussed, Lithuanian soils, their properties and research development, agroclimatic conditions are described, the review of many-year experiments as well as the research objectives and conditions are presented.

Geoderma, 2006

Large archive databases of soil organic matter (SOM) widely exist in Lithuania and the other coun... more Large archive databases of soil organic matter (SOM) widely exist in Lithuania and the other countries of Central and Eastern Europe. Despite the demise of the former Soviet Union over 16 years ago, and Lithuania's integration as a full European Union state, difficulties of SOM data acceptance remain where these results are presented for publication in international journals, due to methodological differences between laboratory protocols. Therefore, the scientific pilot project 'Carbon sequestration in Lithuanian soils', supported by the Leverhulme Trust (U.K.), included an objective to correlate soil carbon methodologies, using Lithuanian Eutric Albeluvisols. A comparison of SOM content data acquired using five different analytical methods is reported. The research programme included a specific objective to correlate analytical methods for SOM analyses. A total of 92 Eutric Albeluvisol samples were collected from topsoil (0-0.2 m: Ap, n = 36; Ah, n = 10) and subsoil (0.2-0.4 m: Bt, n = 46) horizons of 46 long-term experimental field plots at the Kaltinenai Research Station of the Lithuanian Institute of Agriculture. Each sample was then subsampled and analysed for SOM using dry combustion (by automatic elemental analyser), Walkley-Black (USDA), Tyurin photometrical, Tyurin titrimetrical and loss-on-ignition (LoI) methods (the later performed, in parallel, in both Lithuania and U.K. laboratories). Linear correlation and paired regression equations were calculated. Correlation coefficients between the sets of results varied between r = 0.81-0.96 (from 0-0.2 m, n = 46, P < 0.001) and r = 0.76-0.98 (from 0.2-0.4 m, n = 46, P < 0.001). Based on the strength and significance of these relationships, it is proposed that simple linear or more complex paired regression equations can be confidently employed to recalculate SOM data between various analytical methodologies. Future work will continue these investigations on other soil units and environments, hereby enhancing the database.

Zemdirbyste

Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station ... more Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station of the Lithuanian Institute of Agriculture on the undulating topography of Western Lithuania. Results from 18-years of field investigations show significant increases in soil organic matter (SOM) content under grass-grain crop rotations compared with field and graingrass crop rotations, which thus provides evidence for carbon sequestration in soil. SOM content was analysed using the Tyurin titrimetric method, which is not widely used in Western Countries. Therefore, SOM data are also presented after split analysis using dry combustion, Walkley-Black (USDA) and loss-on-ignition (UK) methods, enabling the calculation of transfer functions between databases. International comparison of SOM databases assists many tasks, which include evaluating the importance of SOM/SOC in international collaborative terrestrial ecosystem studies, the development of effective soil conservation policies and the creation of a sustainable future for the modern Lithuanian rural society.

Field case studies of soil organic matter sequestration in Lithuania and the UK

International Journal of Design & Nature and Ecodynamics, 2008

ABSTRACT

The productivity and energy potential of alfalfa, fodder galega and maize plants under the conditions of the nemoral zone

Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2015

Application of environmental protection measures for clay loam Cambisol used for agricultural purposes

Journal of Environmental Engineering and Landscape Management, 2011

Field experiments were done at the Joniškėlis Experimental Station of the Lithuanian Institute of... more Field experiments were done at the Joniškėlis Experimental Station of the Lithuanian Institute of Agriculture (LIA) during 2004–2006. The experiments were done on a productive clay loam Gleyic Cambisol used for agricultural production and were designed to estimate the effects of various catch crops—red clover (Trifolium pratense L.) and white clover (Trifolium repens L.) mixture with Italian ryegrass (Lolium multiflorum

Zemdirbyste-Agriculture, 2015

Nowadays the priority in agriculture is given to the soil tillage systems which enable reduction ... more Nowadays the priority in agriculture is given to the soil tillage systems which enable reduction of organic matter decomposition. Our investigation was aimed to assess the long-term impact of reduced intensity tillage systems, straw and green manure combinations on soil organic matter quantity and quality. Since 1999, a long-term field experiment has been done at the Experimental Station of Aleksandras Stulginskis University (former Lithuanian University of Agriculture) at 54º52′50′′ N latitude and 23º49′41′′ E longitude. The results presented in this paper were obtained in the 12 th and 14 th years of investigations. The soil of the experimental site is Epieutric Endocalcaric Endogleyic Planosol. Continuous long-term (12 and 14 years) straw application increased soil organic carbon (SOC) content by 9.3% and 12.0% compared with the plots without straw. Reduced tillage systems without primary tillage (shallow rotovating before sowing, catch cropping for green manure with rotovating, no-tillage) were even more effective. Compared with conventional ploughing, SOC increased by 19.4% to 33.9%. These tillage systems increased soil quality too, since SOC stratification ratio between 0-10 and 10-20 cm layers increased by 1.14 till 1.21. Reduced tillage systems with primary tillage (shallow ploughing and shallow loosening) had no effect both on SOC and stratification process in the soil. SOC pools over the experimental years tended to increase by 9.3% and 11.6% in the treatments of long-term application of straw compared with the plots without straw. Notillage and catch cropping for green manure with rotovating compared with conventional ploughing significantly increased the pools of organic carbon by 31.7% to 33.3% in the plots without straw and by 28.9% to 32.7% in the plots with straw. Continuous straw application increased the quantity of mobile humus substances by 22.7% compared to the plots without straw. Straw in combination with catch crop for green manure incorporation and rotovating and no-tillage increased mobile humus substances by 53.2% and 58.8% compared with conventional ploughing. Only long-term application of straw increased the quantity of mobile humic acids by 40.6% compared with the plots without straw. The rate of mobile humic acids from total amount of mobile humus substances in the treatments without straw amounted to 39.8%, while with straw this content increased to 45.6%. Reduced tillage systems without primary tillage had no significant effect on mobile humic acids but tended to increase soil organic matter quality.

Sieros trąšų įtaka vasarinių rapsų sėklų derliui ir kokybei

Žemės ūkio mokslai, 2013

Žemės ūkio mokslai, 2014

Lietuvos agrarinių ir miškų mokslų centras, Instituto al. 1, LT-58344 Akademija, Kėdainių r. El. ... more Lietuvos agrarinių ir miškų mokslų centras, Instituto al. 1, LT-58344 Akademija, Kėdainių r. El. paštas: ruta@alteja.lt; alvyra@lzi.lt Lietuvos agrarinių ir miškų mokslų centro filiale, Agrocheminių tyrimų laborato� rijos vegetacinių bandymų aikštelėje, 2010-2012 m. buvo atlikti du vegetaciniai bandymai. Bandymams įrengti buvo atvežti du skirtingi dirvožemiai. Pirma� sis -smėlingas lengvo priemolio, sekliai karbonatingas, giliau glėjiškas rudžemis (Epicalcari -Endohypogleyic Cambisol), atvežtas iš Radviliškio r., Skėmių bandymų lauko. Antrasis -smėlingas priemolio tipingas paprastasis išplautžemis (Haplic Luvisol), atvežtas iš Varėnos r., Perlojos bandymų lauko. Vegetaciniuose induose auginta vasarinių kviečių veislė 'Triso' , tręšta tokiomis sieros normomis: netręšta (kontrolė), S 20 , S 40 , S 60 . Vidutiniais tyrimų duomenimis, karbonatinga� Vidutiniais tyrimų duomenimis, karbonatinga� me rudžemyje ir paprastajame išplautžemyje sieros trąšos turėjo esminės įtakos vasarinių kviečių grūdų derliaus padidėjimui, didžiausias derlius gautas tręšiant S 60 trąšų norma, o didesnis sieros trąšų efektyvumas derliui nustatytas vasarinius kviečius auginant karbonatingame rudžemyje. Žalių baltymų kiekis esmingai di� desnis karbonatingame rudžemyje gautas tręšiant S 20 trąšų norma, o paprastajame išplautžemyje -S 20 ir S 60 . Vidutiniais duomenimis, abiejuose bandymuose sieros trąšos neturėjo esminės įtakos krakmolo kiekiui kviečių grūduose, tačiau turėjo tendenciją didinti sausojo glitimo kiekį. Raktažodžiai: dirvožemis, siera, vasariniai kviečiai, baltymai, glitimas ĮVADAS Nors vasariniai kviečiai ir nėra labai reiklūs sie rai, tačiau pastaraisiais metais Vakarų Europoje pa stebimas jos trūkumas. Esant sieros trūkumui už auginamas mažesnis ir prastesnės kokybės va sa rinių kviečių derlius (Wrigley, Du Cros, Fulling ton, Kasarda, 1��4� Castle, �andall, 1��7� Full , 1��4� Castle, �andall, 1��7� Full ington, Miskelly, Wrigley, Kasandra, 1��7). Sieros kiekio svyravimai dirvožemyje gali neigiamai veikti kviečių kokybę ir sunkinti kviečių malimo bei duo nos kepimo procesus. Kai trūksta grūduose sieros ir iš jų gaminama duona, tešla būna prasčiau minko ma. Subalansuotas tręšimas siera užtikrintų gausų ir kokybišką derlių (Moss, Wrigley, Mac�itc�ie, �an , Wrigley, Mac�itc�ie, �an dall, 1��3� Z�ao, Hawkesford, McGrat�, 1���).

Forest, 2008

One of the main objectives of this work was to study the effects of land use on soil carbon, tota... more One of the main objectives of this work was to study the effects of land use on soil carbon, total and extractable SOM and the properties of humic substances. Soil samples were collected in western and central Lithuania and represented Albeluvisol and Cambisol. Total C contents as well as C / N in the soil samples were determined by a dry combustion method using an automatic Vario EL III analyzer. Extractable SOM was measured using sodium pyrophosphate solution and hot water for the extraction procedure. Humic acids were investigated by the methods of gel permeation chromatography and absorption spectroscopy in UV / VIS and IR regions. Experimental evidence suggests that land use conversion had both positive and negative effects on soil total and extractable carbon and SOM. In Albeluvisols, grassland soil was found to contain by 0.2-0.6 g kg -1 more C compared to fallow land (1-1.5 years old). In Cambisols, long-term pasture soil was found to contain by 2.4 g kg -1 more C compared to arable land (16 years) converted from pasture. Results of humic acid analyses by gel chromatography showed a high molecular weight and polydispersity of humic acids. The highest content of humic acids in HWE as well as a high content (29%) of macromolecules with the molecular weight more than 100,000, and the lowest C / N ratio (10.3) were determined in long-term pasture soil.

Zemdirbyste

Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station ... more Data have been obtained for sandy loam Eutric Albeluvisol-ABe at the Kaltinėnai Research Station of the Lithuanian Institute of Agriculture on the undulating topography of Western Lithuania. Results from 18-years of field investigations show significant increases in soil organic matter (SOM) content under grass-grain crop rotations compared with field and graingrass crop rotations, which thus provides evidence for carbon sequestration in soil. SOM content was analysed using the Tyurin titrimetric method, which is not widely used in Western Countries. Therefore, SOM data are also presented after split analysis using dry combustion, Walkley-Black (USDA) and loss-on-ignition (UK) methods, enabling the calculation of transfer functions between databases. International comparison of SOM databases assists many tasks, which include evaluating the importance of SOM/SOC in international collaborative terrestrial ecosystem studies, the development of effective soil conservation policies and the creation of a sustainable future for the modern Lithuanian rural society.

Soil carbon status of survived and restoring wood pasture in the protected area Natura 2000

Accumulation of carbon and macronutrients in soil cultivated with legumes under organic management

Evaluation of total, dissolved and humified carbon in a peat soil under re-naturalization

EURASIAN JOURNAL OF SOIL SCIENCE (EJSS), 2015

Tyrimu siekiama nustatyti, kaip renatūralizacijos metu kinta žemapelkės durpžemio PDž (Terric His... more Tyrimu siekiama nustatyti, kaip renatūralizacijos metu kinta žemapelkės durpžemio PDž (Terric Histosol, HSs) cheminė sudėtis. Išanalizuoti dirvožemio ėminiai paimti 2012 m. buvusioje Radviliškio bandymų stoties tyrimų vietoje (0-30 cm) trimis pakartojimais. Nustatyta, kad dėl skirtingo dirvožemio naudo jimo, dirbimo ir tręšimo Terric Histosol turėjo nevienodą kiekį C, N, K ir P. Skir tingai naudojamo žemapelkės durpžemio pH svyravo nuo 5,5 iki 7,5. Didžiausi C org , N, P bei judriųjų humuso ir huminių rūgščių kiekiai nustatyti žemapelkėje su nepašalintu durpių sluoksniu, palyginti su nukastos žemapelkės durpžemiu, naudotu skirtingoms žemės ūkio reikmėms. Dėl intensyvios mineralizacijos nenukastame durpiniame dirvožemyje nustatyta didžiausia P koncentracija bu vusiame sėjomainos lauke (0,17 %) ir nenaudojamoje žemapelkėje (0,16 %), kur nustatyta mažiau humuso ir huminių rūgščių. Tyrimų vietoje pastaruosius 12 metų vykstant renatūralizacijai tarp skirtingos žemėnaudos laukų yra pastebi mi dirvožemio cheminių savybių skirtumai. Jie yra tiesiogiai susiję su dirvožemio naudojimo žemės ūkio tikslams skirtumais.

Chemical properties of Pachiterric Histosol as influenced by different land use

Zemdirbyste-Agriculture, 2015

Journal of Food Agriculture and Environment

The accumulation of soil organic matter (SOM) content and composition of agrarian lands and prote... more The accumulation of soil organic matter (SOM) content and composition of agrarian lands and protected areas was assessed. The most SOM was accumulated in pre-mainland section of floodplain meadows of Nevėžis; this quantity exceeds more than 5 times SOM content in agrarian land grown with swards, and also was higher than SOM content of wood pasture. However, amount of SOM in surface soil layer (0–10 cm) of pre-mainland section was equal to 143.2 g kg -1 soil, in 10–20 cm layer – 81.4 g kg -1 soil, and in 20–30 cm layer – 30.9 g kg -1 soil. The most unfavorable status of SOM was determined in the soil of riverside section of floodplain of the Nevėžis River. It characterizes low concentrations of SOM – 14.6, 7.0, and 7.3 g kg -1 soil in the 0–10, 10–20 and 20–30 cm layers, respectively, and relative share of MHS accounted for as much as 47.8–57.9% of soil organic carbon.

Field and laboratory investigations were done at the Lithuanian Institute of Agriculture (LIA) an... more Field and laboratory investigations were done at the Lithuanian Institute of Agriculture (LIA) and Joniskelis Research Station of LIA, Lithuania. The aim of the study was to compare the soil organic carbon (SOC) as well as carbon of mobile humic acids (MHA) contents in the differently used agricultural soils. The data of SOC and MHA investigated in four different field experiments are discussed in this article. In the Experiment 1 the study investigated two soil tillage systems: conventional and sustainable (factor A) and crop rotations with different structure of winter crops (0−100%) (factor B) on a Endocalcari-Endohypogleyic Cambisol at the Joniskelis Research Station of LIA. The field Experiment 2 compared the influence of long-term legume swards on SOC and MHA in an Epicalcari-Endohypogleic Cambisol. In the Experiment 3 the treat-ments of factor A involved 7 different swards and the treatments of factor B of this experiment involved frequent and less frequent grazing. Five past...

Dirvožemio ėminiai surinkti ekspediciniu būdu Vakarų Žemaitijoje 2007 metų pavasarį. Pagrindinis ... more Dirvožemio ėminiai surinkti ekspediciniu būdu Vakarų Žemaitijoje 2007 metų pavasarį. Pagrindinis šių tyrimų tikslas -įvertinti dirvožemio anglies bei su ja susijusių elementų pokyčius, jų tarpusavio santykius, istoriškai skirtingai susiklosčiusiose žemėnaudose. Cheminėms analizėms dirvožemio mėginiai sumalti ultracentrifūginiu malūnu ZM 200 su 0,2 mm sietu. Anglies (C), azoto (N), sieros (S) kiekiai nustatyti naudojant automatinį analizatorių Vario EL III; Pspektrofotometriškai su Carry 50 (VARIAN, Vokietija). Dirvožemio organinė medžiaga perskaičiuota iš organinės anglies naudojant vidutinį koeficientą 1,724. Dirvožemio 0-30 cm sluoksnyje buvo nuo 1,312 iki 2,830 % C. Dirvožemio organinė medžiaga skirtingose žemėnaudose rasta nuo 2,05 % buvusios senos kaimavietės dabar agrariniams tikslams nenaudojamame dirvožemyje Paleičiuose iki 4,61-4,67 % sukultūrintame senos agrarinės būklės dirvožemyje Nikėlų kaime. Buvusios senos kaimavietės dirvožemyje nustatyta azoto (N) 0,093 %, o gerai sukultūrintame -0,189 %. Kaimavietės dirvožemyje C:N rodiklis buvo 14,1; vadinamosios jaunos agrarinės būklės teritorijoje Palendriuose -10,8-11,0; gerai sukultūrintame senos agrarizacijos dirvožemyje -14,7-15,0; brandžiame Kalniškės -Jurgaičių miške, esančiame greta sukultūrinto dirvožemio, -15,9; natūraliame neliestame Kūlinų miško dirvožemyje -22,9. Jaunos agrarizacijos teritorijų dirvožemiai pasižymėjo mažesniu C:N, negu ilgą laiką kultūrinami dirvožemiai. Iš esmės daugiau sieros buvo žemdirbystei naudojamuose dirvožemiuose, ypač senos agrarizacijos teritorijose, palyginus su natūraliais. Miško dirvožemyje N:S 0-30 cm sluoksnyje buvo 9,8; natūraliame dirvožemyje, kuriame sieros buvo labai mažai -15,5. C:S svyravo plačiose ribose: nuo 156 miške iki 219 dvidešimt penkerių metų sėtame žolyne ir 268 -natūraliame brandžiame miške. Agrarinėse žemėnaudose C:S rodiklis buvo iš esmės mažesnis, palyginus su natūraliomis. Fosforo (P) kiekis taip pat iš esmės skyrėsi natūraliame ir sukultūrintame dirvožemiuose. Mažiausias P kiekis buvo miško dirvožemyje (0,023-0,035 %), o sukultūrintame šis rodiklis buvo du kartus didesnis -0,070 %. Fosforo ir azoto dalis organinėje medžiagoje jaunos agrarizacijos teritorijos buvo pastebimai didesnė, negu senos agrarizacijos, o pati mažiausia -natūraliame miško dirvožemyje.

This book (in Lithuanian with English summary) presents scientific achievements of half a century... more This book (in Lithuanian with English summary) presents scientific achievements of half a century research carried out in Lithuania in one of the most important branches of agronomy science - agrochemistry. The book comprises 14 chapters. In the chapters 1 to 5 the importance of long-term studies is discussed, Lithuanian soils, their properties and research development, agroclimatic conditions are described, the review of many-year experiments as well as the research objectives and conditions are presented.