Soil Acidity Research Papers - Academia.edu (original) (raw)

This paper presents the effect of hydric stress on Select sunflower hybrid grown under near-neutral and acid soil conditions. The experiment was conducted in green - house with sunflower plants grown in PVC tubs filled with: near- neutral... more

This paper presents the effect of hydric stress on Select sunflower hybrid grown under near-neutral and acid soil conditions. The experiment was conducted in green - house with sunflower plants grown in PVC tubs filled with: near- neutral soil (pH = 6.2 ) (I), acid soil (pH = 5.27) (II) and ferti-lized acid soil ((phosphorus (100 kg/ha), potassium (100 kg/ha)

Lowland heath is an internationally important habitat type that has greatly declined in abundance throughout Western Europe. In recent years this has led to a growing interest in the restoration of heathland on agricultural land. This... more

Lowland heath is an internationally important habitat type that has greatly declined in abundance throughout Western Europe. In recent years this has led to a growing interest in the restoration of heathland on agricultural land. This generally requires the use of chemical treatments to return soil chemical conditions to those appropriate for the support of heathland ecosystems. However, the potential

... the calibrated equations were compared with the CaCO 3 1‐month incubation LR rates (Tables 6– 8). Ssali and Nuwamanya (198117. ... The authors thank Roger Bender, Andy Kleinschmidt, Jonah Johnson, Alan Sundermeier, Howard Siegrist,... more

... the calibrated equations were compared with the CaCO 3 1‐month incubation LR rates (Tables 6– 8). Ssali and Nuwamanya (198117. ... The authors thank Roger Bender, Andy Kleinschmidt, Jonah Johnson, Alan Sundermeier, Howard Siegrist, and Glen Arnold for their help in ...

Effects of lime and gypsum applications on the quality of soybeans grown under no-till (NT) are not well defined yet. A field trial established in 1998 on a dystrophic clayey Rhodic Hapludox, at Ponta Grossa, State of Paraná, Brazil,... more

Effects of lime and gypsum applications on the quality of soybeans grown under no-till (NT) are not well defined yet. A field trial established in 1998 on a dystrophic clayey Rhodic Hapludox, at Ponta Grossa, State of Paraná, Brazil, evaluated grain yield and soybean quality based on oil, protein and nutrient content, after lime and gypsum applications under NT, in a randomized complete block design (n = 3), split-plot experiment. In the main plots, the treatments with dolomitic lime were: control (no lime), split application of lime on the surface (three yearly applications of 1.5 Mg ha¹), surface lime (4.5 Mg ha¹), and incorporated lime (4.5 Mg ha¹). Subplots received four different rates of gypsum: 0, 3, 6, and 9 Mg ha-1. The soybean crop was evaluated in the agricultural years of 20022003 and 20032004. After 58 months, the correction of acidity through surface liming, with full or split rates, was more pronounced in the top layer (00.05 m) and there was greater reaction at the d...

The risk of soil acidification is high in the Athabasca oil sands region (AOSR) in Alberta, Canada, due to elevated SO2 emission and the resultant acid deposition to sensitive, coarse-textured soils. Understanding the sulfate adsorption... more

The risk of soil acidification is high in the Athabasca oil sands region (AOSR) in Alberta, Canada, due to elevated SO2 emission and the resultant acid deposition to sensitive, coarse-textured soils. Understanding the sulfate adsorption characteristics of soils sensitive to acidification will help establish critical loads of acid deposition in AOSR. Sulfate adsorption properties were evaluated and relationships between sulfate

A field experiment was conducted on acidic nitisols of Wolmera District in two locations at 2017 cropping season to determine the response of barley for the combined application of lime and different phosphorus fertilizers. Several barley... more

A field experiment was conducted on acidic nitisols of Wolmera District in two locations at 2017 cropping season to determine the response of barley for the combined application of lime and different phosphorus fertilizers. Several barley growth performances, yield, and plant samples were collected with soil samples to determine soil acidity attributes and nutrient use efficiency. Barley grain yield and growth performances were significantly (P<0.05) affected by the application of different phosphorus sources. The highest grain yield was recorded from NPSB phosphorus fertilizer source in both experimental sites followed by partly acidulated rock phosphate (PARP) with yield improvement of 89 and 52%, over the control treatment respectively. Growth parameters like plant height, spike length, number of tillers, etc., and physical grain quality data (hectoliter weight and thousand seed weight) were significantly affected by all phosphorus sources. The combination of phosphorus fertilizer (NPSB at 69 kg P 2 O 5 ha-1) with lime got a higher grain yield advantage over other treatments. The highest phosphorus concentration in the plant parts was recorded from the fertilizer source of NPSB. This was due to its immediate availability to the plant uptake compared to other sources. The use of partly acidulated rock phosphate or organic hyper-phosphate (MOHP) fertilizer, as an alternative for NPSB application provides a competitive yield advantage for acidic soils of Wolmera area or other similar soil type and agroecology of the country.

Hydrothermal alteration is an important soil forming factor in the vicinity of active volcanic centers, yet we are aware of no studies that have addressed the role of active fumaroles on soil development. This paper examines a soil... more

Hydrothermal alteration is an important soil forming factor in the vicinity of active volcanic centers, yet we are aware of no studies that have addressed the role of active fumaroles on soil development. This paper examines a soil developmental sequence of five pedons established across a thermal gradient (∼100 m) induced by an active fumarole in Lassen Volcanic National Park in

In the Zlatna area located in the Western Carpathian region of Romania, around an industrial complex involved in mining, metallurgical and chemical activities, the environment and particularly the soils are polluted due to the acid rains... more

In the Zlatna area located in the Western Carpathian region of Romania, around an industrial complex involved in mining, metallurgical and chemical activities, the environment and particularly the soils are polluted due to the acid rains and heavy metals on 55,664 hectares. About 68% of the soils in the area affected by the emissions from these industrial activities present a high vulnerability to the impact of these pollution types. The increase of the natural soil acidity up to 3.6-3.9 pH values and soil loading with heavy metals at content levels exceeding up to 41 (Pb), 11 (Cu), 7 (Zn), 4 (Cd) times the maximum allowable limits contributed to soil base depletion, microbiological activity disturbance, organic matter degradation, soil structure deterioration, sheet and gully erosion, as well as landslides.

Soil fertility and crop production are affected by biological processes and these processes, including enzyme activites, are influenced by pH. We investigated the potential of using alkaline phosphatase (AlkP) and acid phosphatase (AcdP)... more

Soil fertility and crop production are affected by biological processes and these processes, including enzyme activites, are influenced by pH. We investigated the potential of using alkaline phosphatase (AlkP) and acid phosphatase (AcdP) activities, for determining the optimum soil pH for crop production and the amount of lime required to achieve this optimum. Five acid soils, which varied widely in selected properties, were treated with CaCO3 at rates of 0, 0.2, 0.5, 1.0 and 2.0× the soil's lime requirement needs. To remove soil variations in absolute enzyme activity values, an AlkP/AcdP activity ratio was used to test soil response. The ratios of AlkP/AcdP responded immediately to the changes in pH caused by CaCO3 additions and an AlkP/AcdP ratio of approximately 0.5 divided soils into those with appropriate pH adjustment and those still needing additional lime treatment. However, incubation of the lime-treated soils for 67 days followed by treating the soils with organic amendments (which included finely ground chicken manure and alfalfa residues) increased the AlkP/AcdP ratios to approximately 3.0. For cropping systems that rely heavily on natural biological processes to maintain productivity, measuring the AlkP/AcdP ratio may be preferable to chemical approaches for evaluating effective soil pH and liming needs.

A laboratory study was conducted to evaluate seven widely used methods to predict soil lime requirement (LR) using 20 acidic South African top and sub-soils with a wide range of properties. The LR methods which were evaluated against a... more

A laboratory study was conducted to evaluate seven widely used methods to predict soil lime requirement (LR) using 20 acidic South African top and sub-soils with a wide range of properties. The LR methods which were evaluated against a standard CaCO3 incubation LR procedure, included: the original Eksteen method with organic matter correction factor (OMCF) , commonly used in the Western Cape; two modifications of the Eksteen method, namely: (i) Eksteen-KCl method, involving the use of 1 M KCl exchangeable acidity instead of titratable acidity at pH 7, and (ii) Modified-Eksteen method, where a correction factor was applied to titratable acidity that was derived from soil data obtained in this study; the Cedara method, most commonly used in KwaZulu-Natal; the ARC-SGI method, developed primarily for Free State soils by the ARC- Small Grain Institute in Bethlehem; the Shoemaker-McLean-Pratt single buffer (SMP-SB) method most commonly used in the North East and North Central regions of the USA; the Adams and Evans single buffer (AE-SB) method most commonly used in the South East and Mid-Atlantic regions of the USA.
The original Eksteen method, although highly correlated with incubation LR, was found to be a relatively inaccurate predictor of LR. The Eksteen-KCl and Cedara methods were found to be highly correlated with incubation LR, yet consistently underestimated LR. The modified-Eksteen method was found to be highly correlated with incubation LR, and was a good predictor of LR. The ARC-SGI method was a considerably poorer predictor of LR, and tended to grossly overestimate LR. The SMP-SB method was found to be highly correlated with incubation LR, and was shown to be reasonably accurate to achieve a target pHKCl of 5.5. Recalibration of the SMP-SB soil-buffer pH with incubation LR resulted in considerable increases in accuracy. The AE-SB method was found to be highly correlated with incubation LR, yet tended to overestimate LR. Recalibration of the AE-SB soil-buffer pH with incubation LR resulted in a sufficient increase in accuracy.
A correlation study was conducted to investigate the relationship between soil properties and both incubation LR and LR methods. It was revealed that soil properties other than soil pH, which are useful indicators of LR are: soil C > variable charge > CECpH 7 > clay + silt. Soil C was found to be a significant contributor to LR due to its association with exchangeable Al and due to its high pH dependent acidity. Titratable acidity was found to be the soil property that most strongly related to soil LR. Variable charge was also shown to exhibit significant relationships with soil parameters that most strongly influence LR. For these reasons, a multiple regression equation was developed that utilised only titratable acidity and variable charge. The multiple regression equation was able to predict 96.76% of the variation observed for incubation LR, and was 97.86% accurate in predicting the LR for each specific soil to obtain a target pHKCl of 5.5. Regarding the relationship between soil properties and LR methods, it was revealed that the local methods, except the ARC-SGI method, were most strongly influenced by exchangeable acidity and Al, and had significant relationships with soil C. The American direct buffer methods were strongly correlated with essentially all of the soil properties studied. This is indicative of the ability of these methods to directly determine the amount of acidity that may originate from various sources in the soil, in order to make a sufficiently accurate LR. It is therefore recommended that the application of direct buffer methods be further developed for use on South African soils in order to further improve the accuracy of LR determination in South Africa. The existing method that was found to most accurately predict LR on a wide range of soils was the modified-Eksteen method.

Low soil pH is a major constraint to maize (Zea mays L.) production on tropical soils due to toxic levels of aluminium (Al) and the concomitant phosphorus (P) deficiency that hinders plant root growth. A preliminary laboratory screening... more

Low soil pH is a major constraint to maize (Zea mays L.) production on tropical soils due to toxic levels of aluminium (Al) and the concomitant phosphorus (P) deficiency that hinders plant root growth. A preliminary laboratory screening was conducted to test 75 Kenyan landrace maize accessions and 12 commercial varieties for response to low soil pH and Al toxicity

A study was made on the effect of application of sapropelles for improving the reaction of cinnamonic pseudopodzolic soil (Planosol), taken from the land of the village of Zlatosel, the district of Plovdiv, as well as for increasing field... more

A study was made on the effect of application of sapropelles for improving the reaction of cinnamonic pseudopodzolic soil (Planosol), taken from the land of the village of Zlatosel, the district of Plovdiv, as well as for increasing field moisture capacity (FMC) of leached cinnamonic soil (Chromic Luvisol). The obtained results showed that in amounts of 10 g/kg and 20 g/kg, sapropelles neutralize soil acidity of cinnamonic pseudopodzolic soil (Planosol) from 4,5 to 7,3 pH units. In amounts of 10-50 g/kg sapropelles increase field moisture capacity of leached cinnamonic soil (Chromic Luvisol) from 34 g/kg to 244 g/kg, as compared to the control.

Extensive forest areas were ameliorated by large-scale liming in the last years in order to prevent proceeding acidification and degradation of forest soils. The hitherto knowledge of liming effects on the function of forest soils still... more

Extensive forest areas were ameliorated by large-scale liming in the last years in order to prevent proceeding acidification and degradation of forest soils. The hitherto knowledge of liming effects on the function of forest soils still appears insufficient for an unambiguous evaluation. Sorption properties of soils and acidity are favourably affected by liming and the favourable effect is usually manifested in the layer of forest floor humus and in mineral soil within ten years. Reduction of soil acidity stimulates development of a bacterial component of microflora, soil edaphon, and good prerequisites are formed for a release of nutrients from soil organic matter. Improvement of some physical parameters of soils and negative effect of liming on the depth of rooting in spruce, availability of nutrients at some sites and in connection with mechanical soil preparation were also described. A key point of liming effect on forest soils is nitrogen dynamics. Mineralization of nitrogen is...

Soil degradation especially soil acidity and low fertility are the major constraints hampering maize production in Molo district, Kenya. The challenge therefore is to develop sustainable soil management strategies for enhancing maize... more

Soil degradation especially soil acidity and low fertility are the major constraints hampering maize production in Molo district, Kenya. The challenge therefore is to develop sustainable soil management strategies for enhancing maize production and concomitantly food security. A three-year field experiment were conducted on smallholder farms (SHF) of Molo to test the effectiveness of applying low cost technologies (LCT): lime,