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.
关键词
水稻/稻田/稻萍共生/磷肥利用效率/磷肥回收利用率
Key words
Rice/Paddy fields/Integrated rice-Azolla imbircata cropping/Phosphorus fertilizer use efficiency/Recovery utilization rate of phosphorus fertilizer
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