Effect of long-term application of fertilizer and crop sequences on phosphorus in an Ustochrept in Punjab
1993
Boar, S.P.S. | Singh, B. | Singh, J. | Benbi, D.K. (Punjab Agricultural Univ., Punjab (India). Dept. of Soils)
The effect of fertilizer application and different crop sequences on the utilization, accumulation, and depletion of Olsen extractable P and other fractions of P in the soil after 10 cycles of cropping are reported. The apparent recovery of P declined in the sequence rice-wheat, rice-berseem, cotton-wheat, maize-wheat, groundnut-wheat, and pearl millet - berseem. Application of P increased Olsen extractable P in the soil profile under all the crop sequences. The increase was less under rice-based sequences. The differences in Olsen extractable P in the control (no NPK) and fertilizer treated plots were larger up to upper 45, and beyond that the differences were small and decreased with depth. The P uptake by crops was significantly related to Olsen extractable P in the 0-15 cm soil depth.
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