Response and dynamics of soil phosphorus to straw incorporation under simulated paddy-upland rotation conditions

doi:10.14088/j.cnki.issn0439-8114.2025.06.008

Abstract

Abstract: To investigate the effects of straw incorporation on soil phosphorus dynamics under paddy-upland rotation systems, soil samples from long-term rice-rapeseed rotation experimental fields were collected for indoor simulation experiments. Four treatments were established: upland cropping (D), paddy cropping (W), upland cropping+straw incorporation (D+S), and paddy cropping+straw incorporation (W+S). Soil phosphorus fractions were extracted and quantified using the Hedley phosphorus fractionation method, and the soil available phosphorus variations were observed. The results showed that under upland conditions, straw incorporation increased soil available phosphorus by 20.6%, while under paddy conditions, it enhanced available phosphorus by 56.4%. Overall, available phosphorus content improvement was more pronounced under paddy cropping than under upland cropping. Comprehensive analysis indicated that the W+S treatment most effectively enhanced soil available phosphorus. Redundancy analysis (RDA) revealed that water regime and straw incorporation contributed 73.2% and 26.8%, respectively, to soil phosphorus variations. Straw incorporation not only elevated available phosphorus but also regulated phosphorus speciation, thereby enhancing soil phosphorus supply capacity.

Key words: soil phosphorus, available phosphorus, straw incorporation, paddy-upland rotation, Hedley method

CLC Number:

ZHAO Xi-mei, PEI Xiao-min, LI Ao-ming-yang, LIU Tian-ya, ZHANG Zheng, LI Meng-die, LI Ji-fu. Response and dynamics of soil phosphorus to straw incorporation under simulated paddy-upland rotation conditions[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(6): 39-44.

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