Effects of straw mulching and phosphorus application on forms and availability of soil phosphorus in hilly dryland of Sichuan, China

• Published in: Ying yong sheng tai xue bao Vol. 33; no. 12; p. 3337
• Main Authors: Xiang, Xiao-Ling, Chen, Song-He, Yang, Hong-Kun, He, Peng, Fan, Gao-Qiong
• Format: Journal Article
• Language: Chinese
• Published: China 01.12.2022
• Subjects: Agriculture - methods; China; Fertilizers; Phosphates; Phosphorus; Soil; China; phosphorus form; phosphorus application; P availability; P adsorption and desorption; straw mulching
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.202212.015

We conducted a two-factor split-plot experiment to examine the alteration of soil inorganic phosphorus forms and phosphorus availability under straw mulching and phosphorus fertilizer rates. The main factor was straw mulching and non-mulching, while the sub-factor was phosphorus supply rates, including 0, 75, and 120 kg·hm . We analyzed the characteristics of phosphorus adsorption-desorption, the content of inorganic phosphorus components and their relationship with available phosphorus in hilly upland purple soil in Sichuan. Results showed that compared with the non-mulching, the maximum phosphorus adsorption capacity of straw mulching was notably decreased by 7.7% and 7.4% in the two experimental years from 2018 to 2020. The degree of phosphorus saturation and readily desorbable phosphorus of straw mulching were remarkably increased by 35.4% and 21.6% in 2019 and 18.6% and 35.2% in 2020, respectively. The maximum buffer capacity of phosphorus was not different between straw mulching and non-mulching. The ma