Effects of different new types of nitrogen fertilizer reduction on rice yield,nitrogen fertilizer use efficiency and economic benefit in Chaohu Lake Basin
The aim of this study was to achieve a comprehensive balance between crop yield and the prevention and control of non-point source pollution,to avoid excessive fertilization and unnecessary nutrient loss,and to pro-mote the coordinated development of rice production along with the water environment and ecology in Chaohu Lake Basin.In 2022,a field experiment was conducted in Chaohu Lake Basin using two new types of fertilizers,which were common compound fertilizer and amino acid compound fertilizer.The trial aimed to foster the balanced devel-opment of rice production alongside the water environment and ecology.The experimental design included no nitro-gen application (CK,0 kg·hm-2),farmers' application rate (FP,281 kg·hm-2),20% N reduction (OP1,225 kg·hm-2),and 40% N reduction (OP2,169 kg·hm-2).The effects of yield,N uptake and remobilization,N use efficiency,N loss and economic benefit of rice were analyzed.The results showed that compared with FP,the yield of OP1 was not sig-nificantly different in terms of yield level and yield components,but the yield of OP2 treated with common compound fertilizer was significantly reduced,and there was no significant difference in the panicle number and grain number per spike between OP1 and OP2 treatments.In terms of nitrogen use efficiency,compared with FP,the nitrogen use efficiency in OP1 and OP2 treatments was significantly increased by 50.82% and 53.79%,the nitrogen partial produc-tivity was significantly increased by 29.29% and 64.51%,respectively,and the nitrogen use efficiency of OP2 treat-ment with amino acid compound fertilizer was significantly increased by 37.54%.In terms of economic and environ-mental benefits,compared with FP,the total nitrogen loss of OP1 and OP2 fertilizers was significantly reduced by 39.12% and 60.93%,the production cost was reduced by 13.37% and 18.26%,while the net profit was increased by 8.25% and 3.63%,respectively.The application of amino acid compound fertilizer could also reduce the amount of nitrogen fertilizer by 12.60%.Therefore,a 20% reduction of nitrogen fertilizer in the Chaohu Lake Basin can improve the nitrogen utilization rate of rice,increase the absorption and transport of nitrogen nutrients in the above-ground part of rice,and improve the environment and economic benefits.The application of amino acid compound fertilizer (180 kg·hm-2) is recommended,so as to achieve a win-win situation of environmental and economic benefits.
nitrogen fertilizer reductionnew fertilizersnitrogen uptake and utilizationactive nitrogen emissionyield
万方数据
维普
