A high-efficiency regulation method for optimal root zone temperature under different nitrogen fertilizer using discrete curvature

文献类型： 外文期刊

第一作者： Li, Huimin

作者： Li, Huimin;Gao, Pan;Sun, Zhangtong;Hu, Jin;Wei, Ziyuan;Lu, Miao;Li, Huimin;Wei, Ziyuan;Lu, Miao;Gao, Pan;Sun, Zhangtong;Hu, Jin;Gao, Pan;Wu, Huarui

作者机构：

关键词： U -chord curvature; Chlorophyll fluorescence; Suitable RZT range; Dynamic regulation; Hydroponic tomato seedlings

期刊名称：COMPUTERS AND ELECTRONICS IN AGRICULTURE （ 影响因子：8.9； 五年影响因子：9.3 ）

ISSN： 0168-1699

年卷期： 2025 年 237 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) fertilization plays an important role in plant life activities and growth. To optimize N uptake and improve dry matter accumulation in plants, this study proposed a method to obtain optimal root zone temperatures (RZT) under different N levels. The experiment was designed with five N levels and five RZTs for tomato seedlings, and the chlorophyll fluorescence data of tomato leaves were measured at each treatment. Polynomial regression and elastic net regularization were used to fitting the response curve of Fv/Fo, which is indicated to the potential activity of photosystem II (PSII). The feature parameters of curvature on the response curve were considered as the targets for regulation and were calculated by the U-chord curvature method. The dynamic regulation model of suitable RZT of tomato was obtained by fitting the curvature feature parameters. The results of the verification experiment showed that the experimental group increased root dry weight by 20.60%-92.30%, stem dry weight by 9.09%-39.90%, leaf N content by 2.70%-6.15%, and leaf phosphorus content by 6.08%8.59%. Therefore, RZT optimization has a key role in improving plant photosynthesis, plant N uptake efficiency and dry matter accumulation under different N fertilization conditions. The research is significant for RZT optimization of hydroponic crops with different nutrient supply in protected agriculture.

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