稻萍共生对水稻磷素吸收和磷肥利用效率的影响

Effect of the Rice-Azolla Imbircata Cropping on Phosphorus Absorption and Phosphorus Fertilizer Use Efficiency in Rice

稻萍共生是我国传统的稻作方式,能提高水稻产量和氮肥利用效率,然而目前还鲜有研究关注稻萍共生对水稻磷肥利用效率的影响。通过田间试验,探讨稻萍共生处理对稻田土壤理化性质、水稻产量和磷肥利用效率的影响。结果表明:稻萍共生处理未显著改变土壤有机质、总氮、总磷和有效磷含量,但显著提高土壤硝态氮含量(P<0.05)。稻萍共生促进了水稻的磷吸收,显著增加了籽粒磷吸收量(P<0.05)和地上部总磷吸收量(P<0.05)。此外,稻萍共生还提高了水稻的磷肥回收利用率(P<0.05),说明稻萍共生处理能有效提高水稻磷肥利用效率,为水稻磷肥的高效利用提供了参考途径。

The integrated rice-Azolla imbircata cropping is a traditional rice cultivation way in China,which can improve the rice yield and nitrogen use efficiency.However,few studies have focused on the effect of integrated rice-Azolla imbircata cropping on the phosphorus fertilizer use efficiency in rice.A field experiment was conducted to investigate the effects of the treatment of integrated rice-Azolla imbircata cropping on the soil physical and chemical properties in paddy field,rice yield and the utilization efficiency of phosphorus fertilizer.The results showed that the treatment of integrated rice-Azolla imbircata cropping did not significantly change the contents of soil organic matter,total nitrogen,total phosphorus and available phosphorus,but significantly increased the content of nitrate nitrogen in soil(P<0.05).The integrated rice-Azolla imbircata cropping promoted the acquisition of phosphorus in rice,significantly increased the phosphorus uptake in grain(P<0.05)and the total phosphorus uptake in the aboveground part(P<0.05).In addition,the integrated rice-Azolla imbircata cropping also improved the recovery and utilization rate of phosphate fertilizer in rice(P<0.05),indicating that the treatment of integrated rice-Azolla imbircata cropping could effectively improve the utilization efficiency of phosphate fertilizer in rice,which provided a reference way for the efficient utilization of phosphate fertilizer in rice.