Evaluation of urea phosphate as a phosphorus source for wheat crop in comparison to DAP in calcareous soil
2012
Iqbal, Z. (Nuclear Inst. for Agriculture and Biology, Faisalabad (Pakistan)) | Yaqub, M. (Nuclear Inst. for Agriculture and Biology, Faisalabad (Pakistan)) | Lodhi, A. (Nuclear Inst. for Agriculture and Biology, Faisalabad (Pakistan)) | Tahir, S. | Akhtar, M. | Qureshi, T.M. | Naeem, A.
The efficiency of acidic phosphate fertilizer is considered better as compared to basic phosphate fertilizers in calcareous soils. Urea phosphate (UP), an acidic fertilizer (pH, 2) having 17% N and 44% P2O5 was prepared and evaluated in greenhouse studies for its effect on wheat crop (variety Sehar) in comparison to di-ammonium phosphate (DAP), a basic fertilizer with Ph Tilde 8. The soil used for the pot experiments was a sandy clay loam and calcareous in nature. Phosphorus treatments were applied at sowing time from either source @ 0, 20, 40, 45 60 and 80 mg P2O5 per kg soil. Urea was applied @ 120 mg N per kg soil in three splits to all the pots. Both the P fertilizer sources increased wheat grain yield over control (where no P was applied); which was higher in UP (42.98-48.44 g per pot) as compared to DAP (42.23-44.53 g per pot). Phosphorus uptake in grain was also higher with the application of UP (138-161 mg P2O5 per pot) as compared to DAP (134-145 mg P2O5 per pot). In all the treatments, nitrogen percentage in grains remained almost unchanged and it ranged from 1.93-1.94% and 1.87-1.91% for UP and DAP, respectively. The results suggested that UP was a better source of P for wheat in calcareous soil.
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