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Water use and crop coefficient of the wheat–maize strip intercropping system for an arid region in northwestern China

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  • Wang, Zikui
  • Wu, Pute
  • Zhao, Xining
  • Gao, Ying
  • Chen, Xiaoli

Abstract

Relay strip intercropping of spring wheat and maize is practiced on a large scale in arid regions of northwestern China. In this study, a field experiment was carried out during 2012 and 2013 growing seasons to examine water use and crop coefficient of this system in an arid environment. The experiment comprised three treatments: sole-cropped wheat, sole-cropped maize, and wheat–maize intercropping. The grain yields of both intercropped wheat and maize were enhanced by intercropping. The gross economic profit for wheat–maize intercropping was 16.4% lower than that of sole maize and 95.4% higher than that of sole wheat. The overall land use efficiency was improved by intercropping. The time course of leaf area index in intercropping had the similar trends to those in sole crops with relatively low values, which never exceeded 3.0m2m−2 throughout both growing seasons. Compared to weighted means of the sole-cropping systems, wheat–maize intercropping used 26% and 24% more water in 2012 and 2013, respectively. The water-use efficiency of intercropping was nearly the same as the weighted means of the sole crops. Due to the incomplete groundcover in intercropping plots, more water was consumed as soil evaporation. Averaged over two seasons, the ratio of soil evaporation to actual evapotranspiration was 33.4, 20.7 and 24.1% for intercropping system, sole-cropped wheat and sole-cropped maize, respectively. Crop coefficient (Kc) of sole-cropped wheat was 0.19±0.02, 1.05±0.07, and 0.42±0.09 at the initial, mid and late season in two seasons, respectively. Kc value of the sole-cropped maize was 0.22±0.03, 1.10±0.06 and 0.60±0.02 at the initial, mid and late season, respectively. The Kc values of the wheat–maize intercropping system varied in 0.21±0.03, 0.89±0.05, and 0.78±0.06 at the initial, middle and late wheat growing season, and in 0.85±0.03 and 0.61±0.01 at the middle and late maize growing season, respectively. Therefore, longer growing season and incomplete ground cover are the main factors that resulted in higher water use for wheat–maize intercropping compared to sole crops. Results of this study can help to improve the irrigation efficiency for the wheat–maize strip intercropping system.

Suggested Citation

  • Wang, Zikui & Wu, Pute & Zhao, Xining & Gao, Ying & Chen, Xiaoli, 2015. "Water use and crop coefficient of the wheat–maize strip intercropping system for an arid region in northwestern China," Agricultural Water Management, Elsevier, vol. 161(C), pages 77-85.
    • Handle: RePEc:eee:agiwat:v:161:y:2015:i:c:p:77-85
    DOI: 10.1016/j.agwat.2015.07.012
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    2. Guodong Chen & Yunlong Zhai & Jianguo Zhou & Yanfang Li & Jiao Lin & Sumei Wan & Quanzhong Wu, 2022. "Optimizing Maize Belt Width Enhances Productivity in Wheat/Maize Intercropping Systems," Sustainability, MDPI, vol. 14(23), pages 1-16, December.
    3. Zhou, Lifeng & Feng, Hao & Zhao, Ying & Qi, Zhijuan & Zhang, Tibin & He, Jianqiang & Dyck, Miles, 2017. "Drip irrigation lateral spacing and mulching affects the wetting pattern, shoot-root regulation, and yield of maize in a sand-layered soil," Agricultural Water Management, Elsevier, vol. 184(C), pages 114-123.
    4. Gong, Xiangwei & Dang, Ke & Liu, Long & Zhao, Guan & Lv, Siming & Tian, Lixin & Jin, Fei & Feng, Yu & Zhao, Yingnan & Feng, Baili, 2021. "Intercropping combined with nitrogen input promotes proso millet (Panicum miliaceum L.) growth and resource use efficiency to increase grain yield on the Loess plateau of China," Agricultural Water Management, Elsevier, vol. 243(C).

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