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Efficiency of applied P fertilizers is very low in alkaline soils. There is need to adopt certain economical approaches to enhance uptake of P from applied P fertilizer. Coating of di-ammonium phosphate (DAP) granules with polymer improves P availability. This technique can further be improved by the addition of certain hormones with the objective of strengthening plant defense against stresses. Plant hormones are considered necessary endogenous molecules which are involved in regulating plant development. Experiments were performed to check the efficacy of hormones enriched polymer coated diammonium phosphate on yield and phosphorus use efficiency of wheat (Triticum aestivum L.) under saline and non-saline soils. In laboratory experiments, the polyacrylamide (PAM) with different concentrations (0, 1, 1.5 and 2%) was coated on phosphatic fertilizer to check the release pattern of P in soil over different time intervals. Selected best concentration of PAM (1%) was mixed with growth regulators (L-tryptophan at 10 and 20 mg L-1 , L-methionine at 1 and 5 mg L-1 and salicylic acid at 5 and 10 mg L-1 ), and coated on DAP fertilizer to investigate P and hormones release pattern in soil. The best concentrations of these hormones blended with best concentration of polymer collectively to check their effect on wheat crop under field conditions. Hormones enriched polymer coated di-ammonium phosphate (HPCDAP) was applied at different rates (25: 50: 75: 100% of recommended-P) along with polymer coated and uncoated DAP fertilizer. Results showed that application of HPCDAP at 100% of recommended rate of P boosted plant height (20%), number of fertile tillers m-2 (20%), grains yield (19%), straw yield (17%), biological yield (16%), total N, P and K- uptakes (26, 32 and 22%, respectively) on normal/nonsaline soil, whereas plant height (27%), number of tillers m-2 (27%), grains yield (26%), straw yield (22%), biological yield (23%), total N, P and K- uptakes (26,47 and 25%, respectively)were increased on saline soil in same treatment. The treatment of 75% rate of HPCDAP had non-significant results compared to full dose (100%) of HPCDAP fertilizer on saline soil. A highly positive relationship between polymer enriched with hormones coated DAP and crop revealed promising results on growth, yield, and P use efficiency of wheat in both saline stressed and non-stressed soil. These results recommend this a novel approach to get optimum cereal yield under salt stress
Humaira Yasmeen, Muhammad Yaseen, Muhammad Naveed, Muhammad Arfan. (2021) EFFECT OF HORMONES ENRICHED POLYMER COATED FERTILIZER ON GROWTH, YIELD AND PHOSPHORUS USE EFFICIENCY OF WHEAT (Triticum aestivum L.) UNDER SALINITY STRESS, Pakistan Journal of Agricultural Sciences, Volume 58, Issue 3.
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