Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 31, Pages 32276-32284Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-06468-1
Keywords
Phosphoric acid; Diammonium phosphate; Farmyard manure; P-32 isotope dilution technique; Freundlich kinetic model
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Funding
- Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad
- Government College University, Faisalabad
- Higher Education Commission (HEC) of Pakistan under NRPU Project [20-3653/NRPU/RD/HEC/14/437]
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Fixation reactions reduce the concentration of soluble phosphorus (P) and affect crop growth in alkaline calcareous soils. In lab and greenhouse studies, phosphoric acid (PA) or diammonium phosphate (DAP) were evaluated at various P rates (0, 18, 36 and 54 mg kg(-1) soil), either as non-mix (designated as NM-PA and NM-DAP, respectively) or after premixing with farmyard manure (FYM) at 400 mg kg(-1) soil (designated as PM-PA and PM-DAP, respectively). The amended soil was incubated at 25 degrees C and 70% water holding capacity for 7 weeks; thereafter, P-32 dynamics were measured using the Freundlich kinetic model. A greenhouse study was also conducted using the same thirteen treatments (as used in incubation experiment) and wheat cultivar (Galaxy 2013) was grown following standard agronomic practices. The results showed that application of PM-PA at the highest rate, which caused maximum change in Pr (Delta Pr = 59%) in laboratory condition, also produced maximum P uptake by grain (190.3 mg pot(-1)) and grain yield (44.1 g pot(-1)) of wheat in greenhouse experiment. Similarly, regression analysis showed that an increase in Pr values caused a corresponding increase in crop parameters. The results suggested that pre-mixing P fertilizer with FYM could be a viable technique to increase P supply and enhance productivity of wheat in alkaline calcareous soils.
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