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- W1933364037 abstract "Phosphorus in a biological system is present in organic and inorganic form and is involved in various chemical and bio-chemical reactions. Phosphorus atom can form co-valent multiple bonds which are flexible in nature, show higher energy characteristics, form a variety of linkages with other ions and show intrinsic stability that facilitates atom exchange in soils (Tomar, 2000). Soil inorganic phosphorus (IP) exists as salts of orthophosphoric acid such as water soluble, Al P, FeP, Ca-P and occluded P. The principal organic P (OP) compounds present in soil are inositol phosphate, phospholipids, nucleic acids and other unidentified esters and phosphoproteins. Since, these forms of soil P have different solubilities, the availability and uptake depend upon their amount in the soil. Though all forms of P in the soils are key to supply the nutrient to the soil solution, the relative proportion of their contribution to the labile pool form from which plants absorb the nutrient (Ravindra and Ananthanarayana, 1999). The proportion of the each of these fractions governs the response to applied P. Salt affected soils are spread widely covering the Indo-gangetic plains, arid regions and coastal areas. The most extensively salt affected soils prevailing in India which is constituting about 9.38 M ha. Salt affected soils are deficient in phosphorus. The transformation and ABSTRACT A field experiment was conducted in saline soil to quantify the fractions of P under maize crop. Seven levels of P viz., 48.75, 65.00, 81.25, 97.50, 113.75 and 130.00 kg ha of P 2 O 5 in the form of super phosphate were added in the soil. The results revealed that the concentration of Ca-P and Fe-P was increased with progress of time in all the levels of P added. Whereas, a gradual decrease in the concentration of organic P, saloid P and Al-P in all the levels of P added over a period of time was noticed. No appreciable change in the reductant soluble Pfraction was observed in different days interval. A non-significant increment in the concentration of all the above fractions with increase in levels of P added was observed. The mean values ranged from 961 to1009 kg, 497 to 512 kg, 239 to 321 kg,88 to 97 kg, 82 to 91 kg and 79 to 89 kg ha in Ca-P, organic P, saloid bound P, Al-P, Fe-P and reductant soluble P, respectively was recorded. See end of article for authors’ affiliations" @default.
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- W1933364037 date "2007-01-01" @default.
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- W1933364037 title "Fractions of phosphorus as influenced by graded levels of phosphorus fertilizer in saline soil." @default.
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