ABSTRACT

There are many environmental problems related to the production of inorganic phosphorus (P) fertilizers as well as their continuous usage, which pose great challenges to sustainable agriculture. Applying inorganic P fertilizers combined with pigeon manure tea (PMT) could be a promising strategy to enhance P use efficiency and yield of crop plants. Therefore, this study investigates the effect of integrated use of inorganic P and PMT on P sorption using Freundlich sorption isotherms as well as the availability of P and its use efficiency by wheat grown in a calcareous sandy soil. Application of PMT amendment significantly enhanced P availability compared to the unamended soil. The PMT significantly decreased the rate of P sorption from 246 to 179 mL g⁻¹ and sorption capacity of the soil from 388 to 298 µg P g⁻¹ soil. Consequently, the P fertilizer quantity required to produce the desired level of P in solution (0.2 mg L⁻¹) was low in PMT amended soil (114 mg P kg⁻¹) than that in control soil (140 mg P kg⁻¹). Application of inorganic P in combination with PMT increased P use efficiency (PUE) of the wheat plant. Thus, the combined application of PMT and P fertilizer has positive, complementary, and synergistic effects on P availability in soil and its uptake by wheat plants. Due to its low cost and easy availability, integrated use of PMT_1:100 (2.4 t PM ha⁻¹) and inorganic P fertilizer could be an effective amendment to reduce P-sorption and improve soil P availability in the calcareous sandy soil.

摘要

无机磷（P）肥料的生产及其持续使用存在诸多环境问题，对可持续农业提出了巨大挑战。施用无机磷肥和鸽粪茶（PMT）可能是提高作物植物磷利用效率和产量的有前景的策略。因此，本研究利用 Freundlich 吸附等温线研究了无机 P 和 PMT 的综合利用对 P 吸附的影响，以及在钙质沙质土壤中生长的小麦对 P 的有效性及其利用效率。与未改良的土壤相比，PMT 改良剂的应用显着提高了 P 的有效性。PMT 显着降低了 P 的吸附速率，从 246 降低到 179 mL g ^-1，土壤的吸附能力从 388 降低到 298 µg P g^-1土壤。因此，在 PMT 改良土壤（114 mg P kg ^-1 ）中产生所需 P 水平（0.2 mg L ^-1 ）所需的 P 肥料量低于对照土壤（140 mg P kg ^-1） . 无机磷与 PMT 相结合的应用提高了小麦植株的磷利用效率 (PUE)。因此，PMT 和磷肥的联合施用对土壤中磷的有效性和小麦植株的吸收具有积极、互补和协同的作用。由于其成本低且易于获得，PMT _1:100（2.4 t PM ha ^-1）和无机磷肥的综合使用可能是减少钙质沙土中磷吸附和提高土壤磷有效性的有效改良剂。