Effects of different genotypes soybean and maize intercropping on soil phosphorus fractions and crop phos-phorus uptake
Reasonable soybean-maize intercropping mode can effectively promote soil phosphorus tumover and crop phosphorus absorption,and reduce phosphorus fertilizer input.To optimize phosphorus(P)-use efficiency in soy-bean/maize intercropping system,we intercropped two genotypes of soybean with maize to investigate the rhizo-sphere processes and mechanisms underlying soil biological P fractions and crop P uptake.The results showed that intercropping significantly depleted the rhizosphere soluble inorganic P(CaCl2-P)content in soybean genotype Yuechun 03-3,without impact on the P fractions in the rhizosphere of soybean Essex.Similarly,intercropping sig-nificantly increased biomass and P uptake of soybean genotype Yuechun 03-3 by 42.2％and 46.9％,respectively,compared to monoculture.However,it did not affect P uptake and biomass of soybean Essex and maize.Intercrop-ping significantly increased both the total root length and the quantity of root exudates in Yuechun 03-3 by 19.7％and 138.1％,respectively.There was a significant positive correlation between P uptake and total root length in Yuechun 03-3,while a significant negative correlation between soluble inorganic P content and P uptake.In sum-mary,intercropping of soybean and maize exhibited noticeable genotype differences in its impact on soil P fractions and crop P uptake.Intercropping has the potential to improve soybean P uptake and rhizosphere P tumover,mainly by increasing root length and root exudates of P-efficient genotype.The study would provide scientific evidence for optimizing the pairing of soybean and maize varieties in intercropping systems,thereby enhancing phosphorus utili-zation efficiency and reducing fertilizer inputs.
intercroppingsoybean genotypesoil phosphorous fractionphosphatasephosphorus use efficiency
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