ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 70 Number 4
Effect of long-term application of fertilizer and crop sequences on phosphorous in an Ustochrept in Punjab
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, 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 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 large 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 0-15cm soil depth.
Keywords: P accumulation; Long-term fertilizer application; Crop sequence; P movement