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Acta Agronomica Sinica ›› 2025, Vol. 51 ›› Issue (2): 459-469.doi: 10.3724/SP.J.1006.2025.41019

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Yield effect and its root and soil enzyme characteristics of oat and red kidney bean strip intercropping

ZHANG Chen-Yu1,GE Jun-Yong2,CHU Jun-Cong1,WANG Xing-Yu2,ZHAO Bao-Ping3,YANG Ya-Dong1,*,ZANG Hua-Dong1,ZENG Zhao-Hai1,*   

  1. 1 College of Agronomy and Biotechnology, China Agricultural University / Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs, Beijing 100193, China; 2 Zhangjiakou Academy of Agricultural Sciences, Zhangjiakou 075000, Hebei, China; 3 College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, Inner Mongolia, China
  • Received:2024-03-10 Revised:2024-10-25 Accepted:2024-10-25 Online:2025-02-12 Published:2024-11-12
  • Supported by:
    This study was supported by the National Key Research and Development Program of China (2023YFD1600702) and the China Agriculture Research System of MOF and MARA (CARS07-B-5, CARS07-A-6).

Abstract:

To evaluate the yield of a bean and cereal intercropping system and its relationship with root and soil enzyme characteristics, a two-year field experiment (2021–2022) was conducted in Zhangbei county, Hebei province, China. The study examined crop yield, root characteristics, and soil enzyme activities in oat and red kidney bean strip intercropping, with oat monoculture and red kidney bean monoculture as controls. The results showed that the land equivalent ratios (LER) for oat and red kidney bean intercropping were 1.07 and 1.08, respectively, over the two years. The partial land equivalent ratios (PLER) for oat were 0.63 and 0.72. While there was no significant difference in net income between intercropping and monoculture systems, the output-to-input ratio in the intercropping system was higher than in either monoculture. At the jointing stage, oat root length, surface area, and volume in intercropping were lower than in monoculture, but these parameters were higher at the filling stage in both the 0–10 cm and 10–20 cm soil layers. For intercropped red kidney bean, the dominance of root morphological parameters shifted to inferiority as the growth stage advanced. Relay intercropping had minimal effects on oat soil enzyme activities but significantly increased the activities of C, N, and ALP acquisition enzymes in the 0–10 cm and 10–20 cm soil layers at the flowering and filling stages of red kidney bean. Partial least squares path analysis revealed that oat yield was primarily influenced by root characteristics, while red kidney bean yield was predominantly regulated by soil enzyme activities. In conclusion, oat and red kidney bean strip intercropping enhances system productivity, provides higher economic benefits, and the yield dynamics of oat and red kidney bean are driven by different underlying mechanisms.

Key words: oat, red kidney bean, strip intercropping, yield, root system, soil enzyme activity

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