Optimizing nitrogen application rate through critical nitrogen concentration dilution curves for sesame under different water conditions
文献类型： 外文期刊
作者： Lv, Rujie 1 ; Shang, Qingyin 5 ; Lv, Fengjuan 1 ; Wang, Ruiqing 1 ; He, Junhai 1 ; Wei, Lingen 1 ;
作者机构： 1.Jiangxi Acad Agr Sci, Soil Fertilizer & Resource Environm Inst, 602 Nanlian Rd, Nanchang 330200, Jiangxi, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Crop Ecophysiol & Farming Syst Middle & Lo, Jingzhou, Peoples R China
3.Natl Engn & Technol Res Ctr Red Soil Improvement, Nanchang, Jiangxi, Peoples R China
4.Natl Agr Expt Stn Agr Environm Yichun, Nanchang, Peoples R China
5.Jiangxi Agr Univ, Key Lab Crop Physiol Ecol & Genet Breeding, Minist Educ, Nanchang 330045, Peoples R China
关键词： Nitrogen management; Nitrogen nutrition index; Precipitation variability; Drought stress; Uncertainty
期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.5； 五年影响因子：6.9 ）
ISSN： 0378-3774
年卷期： 2025 年 316 卷
页码：
收录情况： SCI
摘要： Sesame (Sesamum indicum L.), a crucial oilseed crop renowned for high oil and protein content of seed, faces yield and quality constraints in southern China's red soil regions due to seasonal drought and low soil fertility. To optimize nitrogen (N) management under varying precipitation regimes, we developed and validated critical nitrogen concentration (Nc) dilution curves using two sesame cultivars, Jinhuangma and Ganzhi 14, in different water conditions and locations. Compared with the wet year, drought stress triggered a 53.3 % yield loss for sesame in dry year. There was no statistical differences in the Nc dilution curve across two varieties in the same precipitation year. Therefore, we derived a unified Nc dynamics of sesame (the dry year: Nc = 3.05 DM- 0.24; the wet year: Nc = 2.60 DM- 0.29). Independent experiments verified that the Nc curves for different precipitation years effectively distinguish between N-limiting and non-N-limiting treatments. The nitrogen nutrition index (NNI) and accumulated nitrogen deficit (Nand) effectively reflected N status, identified that optimal N application rates were 135 kg ha-1 in wet years and 90 kg ha-1 in dry years. The strong correlations between NNI, Nand and yield across precipitation scenarios, indicates the predictive power of them in enhancing yield outcomes. This study underscores the applicability of Nc dilution curves in refining N management strategies, advocating for tailored nitrogen fertilization approaches to bolster sesame productivity and sustainability in drought-prone agricultural regions.
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