Effects and Mechanisms of Phosphate Activation in Paddy Soil by Phosphorus Activators

Sustainability

Jiale Hong¹  Junying Yang¹  Huanli Yao¹  Jihong Li¹  Yueming Hu²  Xian Chen³  Xiaoyun Mao³ 

[1] College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, Guangdong, China;Guangdong Provincial Key Laboratory for Land Use and Consolidation, South China Agricultural University, Guangzhou 510642, Guangdong, China;Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou 510642, Guangdong, China;

关键词: agricultural soil;    phosphorus surplus;    environmental risk;    crop yield;   

DOI  :  10.3390/su12093917

来源: DOAJ

【 摘 要 】

Phosphorus (P) build-up in agricultural soils as a consequence of excessive P fertilizer application necessitates the exploration of soil P pool for crop supply. We conducted a soil incubation experiment, pot experiments, and field experiments to study the effects of different P activators (Pas) (humic acid, lignosulfonate sodium, and biochemical humic acid) on soil phosphate fraction, rice yield, and P loss. Through chemical analyses and microbial community structure measurement, we found that Pas significantly increased paddy soil water-soluble P (WSP), available P, Fe-P, and relative abundances of P-mineralizing and P-solubilizing microorganisms, whereas they decreased Al-P and microbial alpha diversity. Our pot experiment results showed that the application of Pas significantly reduced soil P loss and resulted in grain yield comparable to those obtained by fertilization with P fertilizers, and significantly higher than those in the control plants. The results of the field experiment suggested that Pas are able to increase rice yield more significantly than P fertilizers and improve the P utilization efficiency of rice plants. We conclude that application of Pas was more effective in reducing P leaching, soil total P, WSP, and Olsen P than P fertilizers during rice harvest.

【 授权许可】

Unknown