Enhanced maize yield and nitrogen efficiency with low molecular weight fulvic acid: insights into chlorophyll a/b ratio and nitrogen metabolising enzyme activity

文献类型： 外文期刊

第一作者： Li, Fugui

作者： Li, Fugui;Zhang, Shuiie;Chai, Longhang;Guo, Zhiqiang;Li, Peipei;Han, Yanlai;Wang, Yi;Han, Yanlai;Wang, Yi;Chai, Longhang

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关键词： low nitrogen stress; nitrogen utilisation; plant growth; Zea mays L.

期刊名称：PLANT SOIL AND ENVIRONMENT （ 影响因子：1.8； 五年影响因子：2.2 ）

ISSN： 1214-1178

年卷期： 2024 年 70 卷 10 期

页码：

收录情况： SCI

摘要： This study investigates the impact of various molecular weights (MWs) of fulvic acid (FA) on maize growth, grain yield, and nutrient uptake under different nitrogen levels (NLs). A 2 x 3 balanced design was employed, with high (0.2 g N/kg) and low (0.05 g N/kg) NLs, and three FA MW ranges (W1 <= 3 000 D, 3 000 < W2 <= 10 000 D, W3 > 10 000 D) were applied at 25 mg/kg in soil. Significant interactions between NLs and FA MWs were observed in chlorophyll a / b ratio, nitrate reductase and glutamate dehydrogenase activities, nitrogen content, and nitrogen uptake efficiency. Overall, under different NLs, FA application reduced chlorophyll a / b ratio, increased nitrogen metabolism enzyme activities, promoted maize growth, and thereby improved grain yield and nitrogen fertiliser uptake efficiency. Additionally, the promotion effect of low MW FA on these indicators outweighed that of high MW FA, yet the latter exhibited a more pronounced effect on increasing grain nitrogen concentration. Structural equation model analysis revealed direct effects of chlorophyll content, nitrogen accumulation, nitrogen uptake efficiency, NLs and FA MWs on maize grain yield, with FA MWs negatively impacting yield.

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