Recently, the agro-ecological team of Huazhong Agricultural University combined meta big data analysis and field control test verification methods to comprehensively analyze the effects of nitrogen fertilizer application amount and application period on rice yield and quality, and pointed out that it is appropriate Reducing the total amount of nitrogen fertilizer application and reducing the amount of nitrogen fertilizer application per spike and grain fertilizer can significantly improve the eating quality of rice without affecting yield. At the same time, the study analyzed the relationship between rice nitrogen absorption and distribution and rice protein content under different fertilization conditions, and proposed that improving the agronomic utilization of nitrogen (ANUE) is the key to achieving high yield and high-quality balance of rice, which is a transitional condition for rice production. Nitrogen fertilizer optimization management measures for high-yield gourmet cultivation provide theoretical guidance and technical support. The research was published in the Journal of Cleaner Production with the title”Balance rice yield and eating quality by changing the traditional nitrogen management for sustainable production in China”.
Cheng Bo, a 2020 master’s degree student in the School of Plant Science and Technology of our school, is the first author of the paper, and Associate Professor Jiang Yang and Professor Cao Cougui are the co-corresponding authors of the paper. The research was funded by the National Key Research and Development Program and the National Natural Science Foundation of China.
The literature retrieval process and the geographic location of the experimental sites included in the database
Nitrogen fertilizer application rate, agronomic utilization efficiency of nitrogen fertilizer, partial production efficiency of nitrogen fertilizer and rice yield, protein content, amylose content Results of correlation analysis of effect size
Total yield of rice in China has been greatly improved in recent decades. However, this yield improvement is excessively dependent on the input of nitrogen (N) fertilizer. In recent years, since the demand for rice quantity has basically been met, consumers pay more attention to rice quality, especially the eating quality. Increasing N application improves the yield of rice, but it changes the protein and amylose content in rice, generally reducing the eating quality. It is necessary to establish a more reasonable N management to balance yield and eating quality for rice sustainable development in China. In this study, we assessed the effectiveness of various N managements on rice yield and eating quality by meta-analysis. Under traditional N management, increasing the amount of total N and late-stage N applications weaken the yield increase and decrease the eating quality with the significant increase in protein and amylose content in rice. By redu cing total N and late-stage N application input, eating quality and N use efficiency could be significantly improved. Further, conditional inference tree analysis indicated that adjusting the amount of late-stage N application was a major measure to improve traditional N fertilization, since it could increase agronomic N use efficiency in rice production and balance yield maintenance and eating quality improvement. Our supplementary experiment results further confirmed that adjusting N management could improve the rice yield and eating quality with less N input. Thus, we propose the following adjusting N management strategies for rice sustainable production in China:(1) Decreasing the traditional high N rate is absolutely necessary, although it will slightly decrease rice yield, but significantly improve rice eating quality and N use efficiency; (2) Reducing the amount of late-stage N application appropriately could improve the rice eating quality; (3) Improvi ng agronomic N use efficiency is the key to balance rice yield and eating quality. Our results provide an important reference for the future N management in rice production for the purpose of achieving high yield and better eating quality.
Link to the paper:https://doi.org/10.1016/j.jclepro.2021.127793