文献类型： 外文期刊

作者： Wang, Can ¹ ; Peng, Fangli ¹ ; Chen, Siyu ¹ ; Zhao, Qiang ¹ ; Gao, Jie ¹ ; Zhang, Guobing ¹ ; Zhou, Lingbo ¹ ; Shao, Mingbo ¹ ;

作者机构： 1.Guizhou Acad Agr Sci, Inst Upland Food Crops, Guiyang 550006, Guizhou, Peoples R China

关键词： Waxy sorghum-soybean intercropping; Nitrogen fertilizer fate; Plant nitrogen uptake characteristics; 15 N labeling

期刊名称：FIELD CROPS RESEARCH （ 影响因子：6.4； 五年影响因子：6.6 ）

ISSN： 0378-4290

年卷期： 2025 年 326 卷

页码：

收录情况： SCI

摘要： Context: Waxy sorghum intercropped with soybean is a typical example of cereal-legume intercropping systems, which is widely used in southwest China. However, nitrogen fertilizer fate and plant nitrogen uptake characteristics in waxy sorghum-soybean intercropping system remain unclear. Objective: This study aimed to evaluate the biological nitrogen fixation efficiency of soybean, plant nitrogen uptake characteristics of waxy sorghum and soybean, and nitrogen fertilizer fate in waxy sorghum-soybean intercropping system. Methods: A two-year field experiment with 15N labeling micro-plot design was conducted in 2023 and 2024 using a randomized complete block design with three planting patterns and two nitrogen application rates. Planting patterns included sole cropping waxy sorghum (SW), sole cropping soybean (SS), and waxy sorghum intercropped with soybean (WS), and nitrogen application rates included medium nitrogen (N1) and high nitrogen (N2). We investigated the grain yield, land equivalent ratio, and 15N abundance of each sample, and then assessed the biological nitrogen fixation efficiency of soybean, plant nitrogen uptake characteristics of waxy sorghum and soybean, and nitrogen fertilizer fate. Results: Compared with the corresponding sole cropping, intercropping increased the grain yield, plant biomass, plant nitrogen uptake amount, and plant 15N abundance of waxy sorghum, while decreased these parameters of soybean. The grain yield, plant biomass, plant nitrogen uptake amount, and plant 15N abundance of waxy sorghum and soybean under the N1 treatment were higher than those under the N2 treatment. The nitrogen fixation efficiency of soybean among planting patterns and nitrogen application rates was in the order of WS > SS and N1 > N2, respectively. The WS-N1 treatment had the highest land equivalent ratio, which was 1.41 in 2023 and 1.44 in 2024. The nitrogen fertilizer fate and plant nitrogen uptake characteristics under the WS-N1 treatment were as follows: (1) the plant nitrogen of waxy sorghum was composed of 56.92 % of derived from soil, 22.20 % of derived from nitrogen fertilizer, and 20.88 % of derived from nitrogen transfer; (2) the plant nitrogen of soybean was composed of 52.74 % of derived from nitrogen fixation, 38.04 % of derived from soil, and 9.22 % of derived from nitrogen fertilizer; and (3) the direction of nitrogen fertilizer included 45.88 % of absorbed by soybean plants, 39.48 % of absorbed by waxy sorghum plants, 11.63 % of nitrogen loss, and 3.01 % of soil residue. Conclusions: Waxy sorghum intercropped with soybean combined with medium nitrogen application (220 kg ha-1 for waxy sorghum and 18 kg ha- 1 for soybean) obtained a higher agricultural productivity by optimizing plant nitrogen uptake of waxy sorghum and soybean, promoting nitrogen fixation efficiency of soybean, and reducing nitrogen loss rate. Implications: This study provides a help for formulating scientific nitrogen fertilizer management strategies in waxy sorghum-soybean intercropping system.