Optimized Soil Nitrogen Management for Enhanced Photosynthetic Efficiency and Yield in High-Quality Japonica Rice in the Taihu Lake Region

文献类型： 外文期刊

第一作者： Song, Yunsheng

作者： Song, Yunsheng;Xie, Yulin;Dong, Minghui;Chen, Fei;Gu, Junrong;Chen, Peifeng;Zhu, Yongliang;Shi, Linlin;Jin, Xiuliang;Hu, Yajie;Wang, Yixiao

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关键词： High-quality japonica rice; Nitrogen application; Photosynthetic characteristics; Yield; Nitrogen use efficiency; Soil nitrogen surplus

期刊名称：INTERNATIONAL JOURNAL OF PLANT PRODUCTION （ 影响因子：2.2； 五年影响因子：2.5 ）

ISSN： 1735-6814

年卷期： 2025 年 19 卷 2 期

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收录情况： SCI

摘要： In the Taihu Lake region, excessive nitrogen (N) use in high-quality japonica rice cultivation presents sustainability and quality challenges. This study explores photosynthetic responses and yield outcomes under varying N rates, optimizing N use efficiency (NUE, the ratio of N absorbed by the plant to the amount of N applied) and minimizing soil N surplus for sustainable high-quality rice production. A two-year field study was conducted using 'SuJing 4699' japonica rice, with N treatments ranging from 0 to 400 kg ha-1 (increments of 80 kg ha-1). The experimental design followed a randomized block design with three replications per treatment to ensure reliable data and valid statistical analysis. Measurements included dry matter accumulation, chlorophyll content, leaf area metrics, photosynthetic rates, and final yield determinations alongside N content, NUE, soil N surplus, and economic analysis. The results showed that optimal yields were achieved at 240 kg ha-1 of N, significantly improving photosynthetic performance and delaying chlorophyll degradation, but no further yield increases were observed at higher rates. This regime maximized NUE with 44.60 kg kg-1 N recovery and 23.75 kg kg-1 agronomic efficiency. Economic analysis supported these findings, with the highest net income and beneficial output-to-input ratios at this N level. The saturation point for yield increase was found to be at an N application rate of 257.85 kg ha-1, beyond which no significant increase in economic benefits was observed. Zero soil N surplus occurred at 127.44 kg ha-1, highlighting a balance between environmental and economic factors. An N application rate between 240 and 257.85 kg ha-1 optimizes photosynthetic efficiency, yield, and economic return in high-quality japonica rice while addressing soil N surplus concerns. This balance ensures sustainable and efficient rice production in the Taihu Lake region, aligning with both environmental and agricultural sustainability objectives.

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