Chinese Bulletin of Botany ›› 2023, Vol. 58 ›› Issue (1): 122-131.DOI: 10.11983/CBB22176

Special Issue: 杂粮生物学专辑 (2023年58卷1期)

• EXPERIMENTAL COMMUNICATIONS • Previous Articles     Next Articles

Intercropping Effect and Nitrogen Transfer Characteristics of Oat-Mungbean Intercrop

Xiaomin Feng1,2, Xiang Gao1, Huadong Zang2, Yuegao Hu2, Changzhong Ren3, Zhiping Hao1, Huiqing Lü1, Zhaohai Zeng2,*()   

  1. 1Institute of Sorghum Research, Shanxi Academy of Agricultural Sciences/Shanxi Agricultural University, Yuci 030600, China
    2Key Laboratory of Farming System, Ministry of Agriculture and Rural Affairs, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
    3Baicheng Academy of Agricultural Sciences, Baicheng 137000, China
  • Received:2022-07-31 Accepted:2022-10-30 Online:2023-01-01 Published:2023-01-05
  • Contact: *E-mail:

Abstract: To explore the intercropping effect and nitrogen transfer characteristics of oat and mungbean, three planting patterns, oat monocropping, mungbean monocropping, oat-mungbean intercropping, were investigated with both root-digging method and 15N isotope labelling method. The results showed that in intercropping system, oat displayed higher invasiveness than mungbean, whose growth was inhibited. The dry matter accumulation of oat shoot was 14.9%-33.1% higher in intercropping than in monoculture in the whole growing stages. Compared with monocropping, the nitrogen accumulation of oat at two year mature stages was increased by 53.1% and 44.8%, respectively. The intercropping system reduced nitrogen accumulation, nodule weight at flowering and pod stage, and nitrogen fixation efficiency of mungbean. The total nitrogen fixation efficiency of mungbean decreased by 23.7% and the biological nitrogen fixation decreased by 11.66% on average for two years. The nitrogen transfer rate of intercropped mungbean to oat reached 31.7%, and the nitrogen transfer amount was 212.16 kg∙hm-2. The oat-mungbean intercropping decreased nodule nitrogenase activity and nitrogen fixation efficiency of mungbean at flowering and pod stage, but nitrogen transfer in mungbean increased nitrogen uptake and utilization of oat, realized the mutual regulation and promotion between the growth of above and below ground, and meanwhile, optimized the nitrogen management system in farmland ecosystem.

Key words: oat-mungbean intercrop, nodule N fixation, 15N isotope labelling, N uptake, N transfer