Significant Effects of Long-Term Application of Straw and Manure Combined with NPK Fertilizers on Olsen P and PAC in Red Soil
文献类型: 外文期刊
作者: Sun, Fengxia;Sun, Nan;Wang, Boren;Cai, Zejiang;Xu, Minggang
作者机构:
关键词: red soil;manure;straw;Olsen P;phosphorus activation coefficient
期刊名称: AGRONOMY-BASEL
ISSN:
年卷期: 2023 年 13 卷 6 期
页码:
收录情况: SCIE(2023版)
摘要: The application of manure (M) and straw (S) will increase the Olsen P and phosphorus activation coefficient (PAC) in soil. Clarifying the increasing trend of Olsen P and PAC is crucial for rational fertilization. This study fitted the equation between the accumulated P surplus, Olsen P, and PAC in four treatments for 28 years and analyzed the changes and rates of P fractions. The results showed Olsen P and PAC increase linearly with NPK and NPKS treatments; for every 100 kg ha(-1) of P surplus, Olsen P increased by 5.9 and 6.7 mg kg(-1), and PAC increased by 0.52% and 0.50%. With M and MNPK treatments, the sigmoid curve equation was the best fitting method. The equilibrium values were 167 and 164 mg kg(-1) for Olsen P, and 10.4 and 10.2 mg kg(-1) for PAC. There was a correlation between Al-P, Ca-2-P, Resin-P, NaOH-P-i, C/N, SOC, and pH, which had the highest interpretation rates for Olsen P and PAC. Manure is significantly better than straw in improving Olsen P in red soil. It is recommended to reduce the amount of manure applied for a long time to avoid a zero increase in Olsen P.
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