Research articles

Effects of Water-nitrogen Coupling on Changes in Water Consumption Characteristics and Yield of Isatis tinctoria ‖ Glycine max

  • 吕 翔,王玉才
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  • (College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, Gansu China)

Received date: 2024-11-13

  Accepted date: 2025-01-04

  Online published: 2025-10-13

Abstract

To investigate the effects of water and nitrogen application on water consumption and water use efficiency in soybean (Glycine max) intercropped with woad (Isatis indigotica) in the cool-temperate irrigation area of Hexi, the following treatments were established: pure woad (M1), pure soybean (M2), woad : soybean 2:1 (M3), woad : soybean 1:1 (M4), two nitrogen fertilizer gradients—low nitrogen (N1) 200 kg·hm–2 and high nitrogen (N2) 250 kg·hm–2, and two water stress gradients—severe water deficit (W1) and mild water deficit (W2). The effects of cropping patterns and water-nitrogen coupling on crop water consumption, yield, and water use efficiency were analyzed. Results indicate that throughout the crop growth period, crop water consumption increased with higher irrigation and nitrogen application rates, following the pattern W1N1 < W2N2. Under identical nitrogen application conditions, woad-soybean yield significantly increased with higher irrigation rates, while water use efficiency decreased with increased irrigation. Across all treatments, under mild water deficit, the yield of woad-soybean intercropping outperformed monocropping. Within intercropping systems, woad yielded higher, with the W2N1M3 treatment achieving the highest yield of 7500.91 kg·hm–2. Under identical nitrogen application conditions (N2 treatment), the W1 treatment exhibited significantly higher water use efficiency than the high-water W2 treatment. At the W1 level, both woad and soybean yields increased by 20.06% and 17.39%, respectively, compared to W2. This indicates that water-nitrogen coupling exerts significant interactive effects on water use efficiency and yield in woad-soybean intercropping. Simultaneous cropping enhances crop water use efficiency. Therefore, implementing mild water deficit combined with low nitrogen application in woad-soybean intercropping represents an optimal water-saving and high-yield model for woad cultivation in the cold-cool irrigation areas of Hexi corridor.

Cite this article

吕 翔,王玉才 . Effects of Water-nitrogen Coupling on Changes in Water Consumption Characteristics and Yield of Isatis tinctoria ‖ Glycine max[J]. Subtropical Plant Science, 2025 , 54(4) : 420 -427 . DOI: 10.3969/j.issn.1009-7791.2025.04.006

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