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Soil phosphorus dynamics in a Vertisol as affected by cattle manure and nitrogen fertilization in soybean-wheat system

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Title Soil phosphorus dynamics in a Vertisol as affected by cattle manure and nitrogen fertilization in soybean-wheat system
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Creator Muneshwar Singh, Tripathi, A.K., Sammi Reddy, K. and Singh, K.N.
 
Subject cattle-manure, P balance, organic and inorganic P, labile P, P leaching, soybean-wheat, Vertisol, long-term field experiment
 
Description Not Available
Repeated application of phosphorus (P) as superphosphate either alone or in conjunction with cattle manure and fertilizer N may affect the P balance and the forms and distribution of P in soil. During 7 years, we monitored 0.5 M NaHCO3 extractable P (Olsen- P) and determined the changes in soil inorganic P (Pi) and organic P (Po) caused by a yearly dose of 52 kg P ha–1 as superphosphate and different levels of cattle manure and fertilizer N application in a soybean-wheat system on Vertisol. In general, the contents of Olsen-P increased with conjunctive use of cattle manure. However, increasing rate of fertilizer nitrogen (N) reduced the Olsen-P due to larger P exploitation by crops. The average amount of fertilizer P required to increase Olsen-P by 1 mg kg–1 was 10.5 kg ha–1 with- out manure and application of 8 t manure reduced it to 8.3 kg ha–1. Fertilizer P in excess of crop removal accumulated in labile (NaHCO3-Pi and Po) and moderately labile (NaOH-Pi and Po) fractions linearly and manure application enhanced accumulation of Po. The P recovered as sum of different fractions varied from 91.5 to 98.7% of total P (acid digested, Pt). Excess fertilizer P application in presence of manure led to increased levels of Olsen-P in both topsoil and subsoil. In accordance, the recovery of Pt from the 0–15 cm layer was slightly less than the theoretical P (P added + change in soil P – P removed by crops) confirming that some of the topsoil P may have migrated to the subsoil. The P fractions were significantly correlated with apparent P balance and acted as sink for fertilizer P.
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Date 2021-08-31T05:14:02Z
2021-08-31T05:14:02Z
2001-07-20
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/61068
 
Language English
 
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Publisher Not Available