SOIL PHOSPHORUS FRACTIONS IN A TYPIC HAPLUSTEPT AS INFLUENCED BY ORGANIC SOURCES AFTER SOYABEAN (Glycine max L.) – WHEAT (Triticum aestivum) CROPPING SEQUENCE IN SEMI ARID CONDITION*

DOI: 10.5958/j.0976-0547.33.4.030    | Article Id: ARCC330 | Page : 304-308
Citation :- SOIL PHOSPHORUS FRACTIONS IN A TYPIC HAPLUSTEPT AS INFLUENCED BY ORGANIC SOURCES AFTER SOYABEAN (Glycine max L.) – WHEAT (Triticum aestivum) CROPPING SEQUENCE IN SEMI ARID CONDITION*.Agricultural Science Digest.2013.(33):304-308
Anil Kumar, Neeraj Kumar, S.K. Singhal, Vinay Singh1 and V. K. Sharma
Address : Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi-110 012, Indian

Abstract

Rock phosphate enriched biogas slurry, pressmud and farm yard manure alone and in combination with DAP in different ratios (1:3, 1:1 and 3:1) were evaluated in field with soybean-wheat cropping sequence at the IARI, New Delhi on a sandy loam soil. Soil samples (0-15 cm) after the harvest of wheat were taken to examine the residual effect of various treatments on available, inorganic and organic P pools in soil. Application of manure showed significant increase in available P over control. Among the fractions of phosphorus Fe-P, Ca-P and organic P fractions in soil remained almost unaltered while Saloid-P and Al-P fractions were increased in comparison to their initial concentration noted before sourcing the soybean. The extent of increase was more at higher rates of P application to soybean. Application of rock phosphate enriched biogas slurry in the ratio of 1:1 and 3:1 of DAP and manure on P2O5 basis gave the highest increase in the P fractions of soil. Therefore, a change in different inorganic and organic P fraction in soil can be influenced by the manipulation of sources and levels of phosphorus.

Keywords

Biogas slurry Fractions FYM Phosphorus Pressmud Rock phosphate.

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