Evaluation of the Status of P Fractions and Their Relationships with Selected Soil Properties in Some Calcareous Soils = تقدير مكونات الفوسفور و علاقتها ببعض الخواص في الترب الجيرية (original) (raw)
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Journal of the Serbian Chemical Society, 2006
Phosphorus fractions from three highly calcareous soils (average, 24.9 ± 4.8 % CO 3 2-) from sampling sites with a Mediterranean climate were isolated by sequential extraction. In order to provide a more reliable basis for the definition of the obtained P-fractions, principal component analysis was applied and from the chemical characteristics of the 14 investigated soils, those characteristics which define the content and association features of the P-fractions were assessed. The soils are characterized by a relatively high pH (8.0 -8.2) and by significantly differing contents of organic mater, acid-soluble Mg and total P. These differences affected the various association features of the P-fraction with the soil constituents. The NH 4 F-P fraction (isolated with 0.5 M NH 4 F, pH 8.2) is defined by the contents of the main metals of the oxide-hydroxide-clay associations (Al, Fe, Mn) or by the the redox potential (Eh) of Mn. The accumulation of NaOH-phosphorus (extractable with 0.1M NaOH) depended on the constituents of the oxide-hydroxide-clay association, the humic substances and Eh-related factors. In those soils in which NaOH-P is defined by the oxide-hydroxide-clay assoiation, the participation of Fe as a bridge-forming metal is proposed. The main part of total P, i.e., DP = TP -(NH 4 F-P + NaOH-P) is defined by the status of Mn-and Fe-humic complexes or by the concentration of hydroxyl-ions.
Phosphorus Status in the Soils of Imphal West District, Manipur (India
International Journal of Current Microbiology and Applied Sciences, 2018
The phosphorus fractions of the twenty surface soils (0-15 cm) of Imphal West district, Manipur and their relationship with some physico-chemical properties of the soils were studied. A significant relationship was obtained between organic-P and total-P in the soils. The average Sal-P, Fe-P, Al-P, Red-P, Occl-P and Ca-P content were 8.70, 73.38, 50.83, 82.54, 29.00 and 22.17 ppm, respectively. The inorganic P fractions in the soils were in the order: Red-P > Fe-P > Al-P > Occl-P > Ca-P > Sal-P. Sal-P had a significant correlation with E.C. (r = 0.661**) and C.E.C. (r = 0.455*). Fe-P had a negative correlation with soil pH (r = -0.565*) and positively correlated with O.C. (r = 0.502*). Al-P had a negatively correlated with soil pH (r = 0.510*) and positively correlated with O.C. (r = 0.698**), available N (r = 0.508**) and C.E.C. (r =0.699**). Red-P had a significant correlation with C.E.C. (r = 0.555*) and negatively correlated with silt (r = -0.455*). Occl-P had a significant negative correlation with silt content of the soil (r = - 0.530*) and positively correlated with C.E.C. (r = 0.577 **). Ca-P had a positive correlation with E.C. (r = 0.539*), clay (r = 0.583**) and C.E.C. (r = 0.605 **) and negative correlation with sand (r = -0.500 *). Among the different fractions Sal-P, Red-P and Occl-P was positively and significantly correlated with Ca-P (r = 0.534*), (r = 0.583**) and (r = 0.534*), respectively and negatively correlated with Org-P (r = -0.563*) and sal-P. Al-P was positively and significantly correlated with Red-P (0.506*).
Phosphorus Fractions as Correlated to Some Soil Properties in Some Soil Series of Egypt
Journal of Soil Sciences and Agricultural Engineering (Print), 2007
Characterization study were carried out to evaluate the relationship between total, organic and inorganic P fractions and some physicochemical properties of six soil series representing the main soil types of Egypt (typic torri fluvents, typic haplucalcids and typic torri psaments). The obtained results could be summarized as follows: The inorganic P fractions, i.e, saloid, Al-P, Fe-P, occluded P and Cap in soil series varied from 2.85 to 22.8, 30 to 164, 8.2 to 28.0, 24.7 to 130.9, and 121 to 871 mg kg-1 , respectively. CaP contributed to 71.5 % of total inorganic P and 1.13 % only for saloid P. The abundance of different inorganic P forms was in the order Ca-P> Occluded P > Al-P> Fe-P> saloid P suggesting that, CaP and occluded P are the major P fractions to contribute P nutrition by plants. The fractions of CaP and Occluded P found to be positively coinciding with CEC and OM and negatively with pH and CaCO3 responsible for P precipitation over P adsorption as CaCO3 and pH increased in soil. Whereas, Al-P fraction were mainly associated with clay and organic matter content of soils. The higher contents of organic P in the soils of Minia and Giza could be due to heavy later addition of P fertilizer and high organic matter as compare to other soil series. The inorganic P fractions contributed to 89.4 % of total P and 10.6 % only for organic P in the studied soil series. Total P content ranged from 255 to 1300 mg kg-1 in South Tahrir and Giza. However, available P ranged from 6.65 to 29.2 mg kg-1 depending on soil properties. In most soil series, soil content of available P is higher in Giza, Minia and Gazert Uddhab and marginal in Janaklis and South Tahrir. Highly significant positive correlation was found between available and total P of most of the studied soil and each of clay + silt, CEC, OM and available water, whereas significant negative correlation was found with sand and pH.
Relationship between the 0.01 M CaCl2- and AL-soluble soil phosphorus contents
Agrokémia és Talajtan
The traditional Hungarian method for determining soil phosphorus (P) status is ammonium-lactate acetic acid (AL) extraction. AL is an acidic solution (buffered at pH 3.75), which is also able to dissolve P reserves, so there is a need for extraction methods that also characterize the mobile P pool. 0.01 M CaCl2-P is considered to directly describe available P forms, because the dilute salt solution has more or less the same ionic strength as the average salt concentration in many soil solutions. The amount of AL-P may be two orders of magnitude greater than that of CaCl2-P. Previous studies suggested that the relationship between AL-P and CaCl2-P was influenced by soil parameters. Regression analysis between AL-P and CaCl2-P showed medium or strong correlations when using soils with homogeneous soil properties, while there was a weak correlation between them for soils with heterogeneous properties. The objective of this study was to increase the accuracy of the conversion between AL...
2021
Phosphorus (P) is a nutrient essential for plant, which its availability in soils changes with aging process, leaching, precipitation processes, and the landform change. There is limited information available on kinetics release of P in calcareous soils. Therefore, the purpose of this study was to investigate distribution of P and the effect of physicochemical properties and clay minerals on its release in some dominant orders of the calcareous soils in Kohgiluyeh-and-Boyer-Ahmad province, using the 0.01 M calcium chloride ( ) extractant. The results showed that the P released rapidly from the soil and continued slowly. After 72 h, the amount of P released in the studied soils ranged between 3.2 and 25.4 mg kg-1. Evaluation of the fitted different equations on P released in the studied soils revealed that the Simple Elovich and power function equations could well predict the P release process in the studied soils. The results of the correlation between soil properties and released P...
Effects of soil properties on phosphorus fractions in subtropical soils of Iran
Journal of soil science and plant nutrition, 2013
The distribution of inorganic P fractions and their relationships with soil properties was studied in 17 slightly acidic to slightly alkaline soils (pH range 5.37 to 7.61). The soils were selected from agricultural fields of the north of Iran. Inorganic P fractionation included successive extraction with NaOH (NaOH-P), citrate-bicarbonate (CB-P), citrate two times (C1-and C2-P), Citrate-ascorbate (CAs-P), citrate-dithionite-bicarbonate (CBD-P), sodium-acetate buffer (NaOAc-P) and HCl (HCl-P). Results showed that the abundance of P fractions was in the order NaOH-P (35.67 mg kg -1 ) , NaOAc-P (39 mg kg -1 ), C2-P (49 mg kg -1 ), CBD-P (102 mg kg -1 ), CB-P (136 mg kg -1 ), CAs-P (156 mg kg -1 ), C1-P (197 mg kg -1 ), HCl-P (417 mg kg -1 ). Among soil properties, pH had almost a linear negative relationship with NaOH-P and a linear positive relationship with HCl-P; in addition, it significantly affected C1-P, CAs-P and NaOAc-P. Oxalate extractable Fe showed a significant positive correlation with NaOH-P and CAs-P, while calcium carbonate equivalent (CCE) had a significant positive correlation with NaOAc-P and HCl-P.
Distribution of different forms of phosphorus in the soils of subtropical zone of Jammu Region
Journal of the Indian Society of Soil Science, 1999
Phosphorus in soil is present in both organic and inorganic forms. In general, inorganic P is the predominant form of soil P, constituting 20 to 80% of the total P in the surface layer . It is the inorganic fraction, which is more intimately related to phosphate nutrition to plants in agricultural soils. Phosphorus transformation in soils involves complex microbiological, chemical and biological processes. Plant availability of inorganic P can be limited by the formation of sparingly soluble calcium phosphate in alkaline and calcareous soils; by adsorption onto Fe and Al oxides in acid soils and by formation of Fe and Al phosphate complexes with humic acids (Gerke 1992). The nature and distribution of different forms of P have provided useful information for assessing the available P status of soil and for estimating the degree of chemical weathering of the soil, P deficiency, etc. Estimation of available P indicates only the amount of P present in soil solution and soil surface which is available to plants but it does not indicate about the relative contribution of different fractions of P towards available P. Thus understanding of the relationship between various forms of P, their interactions in soil and various factors influencing P availability to plants is essential for efficient P management in soil.
Chemical Fractions of Phosphorus: The Effect of Soil Orders, Soil Properties, and Land Use
Communications in Soil Science and Plant Analysis, 2017
Low availability of phosphorus (P) in Turkish soils is a significant problem of agricultural production depending on carbonates in slightly weathered and iron/aluminium oxides in highly weathered soils. Thus, crop-based P fertilization along with inherited nature of P partition can lead changes in the amounts and geochemical fractions of phosphorus. For this reason, horizon-based surface samples were taken from 16 soil series that belong to 4 orders with different pedotransfer functions. The geochemical phosphorus fractions were sequentially extracted by sodium bicarbonate (NaHCO 3), sodium hydroxide (NaOH), citratedithionite-bicarbonate buffer system (CBD), hydrochloric acid (HCl), and aqua-regia. Results indicated that weathering sequence was inversely related to plant available P fractions. The fertilizer P was possibly converted to HCl-extractable (Ca-Pi) fraction in calcareous soils through NaOH-Po and NaHCO 3-Po fractions whereas it accumulated in the CBD-P fraction in relatively weathered soils. The carbonates and Al/Fe oxides were most significant constituents in P partitioning as consequences of parent material and weathering chronosequence.