Evaluation of the effects of different crop rotation patterns on nitrogen and phosphorus use efficiency and economic benefits of rice in Chaohu Lake Basin
In order to explore the effects of different crop rotation patterns on rice yield and quality,fertilizer utilization efficiency and economic benefits,a field trial was conducted in 2022 in the region surrounding the Chaohu Lake Basin.The trial featured 12 treatments:RWCK,wheat-rice (no fertilization);ROCK,rape-rice (no fertiliza-tion);RMCK,green manure-rice (no fertilization);RWPK,wheat-rice (no nitrogen fertilization);ROPK,rape-rice (no nitrogen fertilization);RMPK,green manure-rice (no nitrogen fertilizer);RWNK,wheat-rice (no phosphate fertilization);RONK,rape-rice (no phosphate fertilizer);RMNK,green manure-rice (no phosphate fertilizer),RW,wheat-rice (conventional fertilization);RO,rape-rice (conventional fertilization);RM,green manure-rice (con-ventional fertilization).The study aimed to analyze the differences of rice yield and constituent factors,nitrogen and phosphorus accumulation,nitrogen and phosphorus use efficiency and economic benefits of different treat-ments.Under the conventional fertilization conditions,the rice yield exceeded 9.0 t·hm-2,and the order of rice yield from high to low showed the law of RO>RM>RW,in which RO and RM were significantly higher than RW,and the yield of RO and RM was increased by 6.53% and 4.90%,respectively,compared with RW.Under the condition of no fertilization,the rice yield was more than 7.0 t·hm-2,but there was no significant difference be-tween treatments.Under fertilization conditions,the RM model could significantly increase the content of soil total nitrogen and organic matter,with an average increase of 8.9% and 5.4% compared with the RW and RO models.Under fertilization conditions,crop rotation had a significant effect on the appearance and quality of rice.Compared with RW and RO,RM treatment significantly reduced the chalkiness and chalky grain rate,with an average decrease of 21.6% and 16.1%,respectively,which improved the appearance quality of rice.Compared with RW,RM and RO treatments significantly reduced the amylose content and enhanced the gel consistency,among which the amylose content decreased by 8.8% and the gel consistency increased by 12.8%,which im-proved the taste quality of rice.In terms of annual crop economic benefits,the RO was 15.6% higher than that of the RW model.In terms of annual nitrogen and phosphorus use efficiency,RM can significantly improve the an-nual nitrogen and phosphorus use efficiency of crops compared with the RW model,in which the nitrogen use efficiency was increased by 21.6% and the phosphorus use efficiency was increased by 64.3%.Compared with the three different crop rotation patterns,the rice-oil model had the highest yield and annual economic benefit.In terms of rice quality,the rice-fertilizer model was superior to the rice-oil and rice-wheat model.In terms of annual nitrogen and phosphorus use efficiency,the rice-fertilizer model was the highest.Therefore,from a comprehensive perspective,it is suggested to increase the planting area of rice-fertilizer mode and increase the planting area of rice-oil model in the first-level protection zone of Chaohu Lake Basin.The findings offer a theoretical basis for increasing rice yield and income,improving the fertilizer utilization efficiency,reducing the pressure of agricul-tural non-point source pollution,and optimizing the traditional planting mode in Chaohu Lake Basin.
ricecrop rotation modequalityfertilizer use efficiencyeconomic benefits
万方数据
维普
