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Optimizing planting density and irrigation depth of hybrid maize seed production under limited water availability

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  • Shi, Rongchao
  • Wang, Jintao
  • Tong, Ling
  • Du, Taisheng
  • Shukla, Manoj Kumar
  • Jiang, Xuelian
  • Li, Donghao
  • Qin, Yonghui
  • He, Liuyue
  • Bai, Xiaorui
  • Guo, Xiaoxu

Abstract

Improvement in seed vigor and yield of hybrid maize is required to ensure food security. Optimal planting density and irrigation depth are critical for hybrid maize seed production in arid areas. Using data from 2012 to 2017, a new integrated model optimized planting density and border irrigation depth for achieving high yield and seed vigor of hybrid maize under limited water availability. For field experiments, a planting density of 9.75 plants m−2 under full irrigation was in the control treatment. The results showed that water deficit decreased yield, evapotranspiration, and aboveground biomass per plant. The highest yield was obtained for the planting density of 12.75 plants m−2 under full irrigation. The single crop coefficient and crop water production function models were modified to simulate evapotranspiration and yield, respectively. Using kernel number per plant and plant growth rate during the flowering stage, a kernel weight model was established. The maximum yield and minimum irrigation depth were weighted and kernel weight was constrained. Three minimum relative kernel weight (RKWmin) options were considered, option 1 with RKWmin= 1.00 (control), option 2 with RKWmin= 0 (unconstrained), and option 3 with RKWmin ranged from 0.60 to 0.90. In option 1, the optimal irrigation depth during the growing season under control planting density decreased by 24.3–39.4% compared to the conventional practices. In option 2, yield increased but average kernel weight decreased by 25% than control. In the option 3, average yield and water use efficiency increased by 9.2% and 6.5% compared to option 1, respectively. The average planting density decreased by 10.2%, yield reduced by 2.0%, and water use efficiency reduced by 1.7%, but kernel weight increased by 9% compared to option 2. Thus option 3 can be recommended for hybrid maize seed production with limited water availability in arid regions of Northwest China. Our research provided a new theoretical method to improve yield, and ensure seed vigor of hybrid maize in arid regions.

Suggested Citation

  • Shi, Rongchao & Wang, Jintao & Tong, Ling & Du, Taisheng & Shukla, Manoj Kumar & Jiang, Xuelian & Li, Donghao & Qin, Yonghui & He, Liuyue & Bai, Xiaorui & Guo, Xiaoxu, 2022. "Optimizing planting density and irrigation depth of hybrid maize seed production under limited water availability," Agricultural Water Management, Elsevier, vol. 271(C).
    • Handle: RePEc:eee:agiwat:v:271:y:2022:i:c:s0378377422003067
    DOI: 10.1016/j.agwat.2022.107759
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    Cited by:

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    2. Chen, Shichao & Liu, Wenfeng & Morel, Julien & Parsons, David & Du, Taisheng, 2023. "Improving yield, quality, and environmental co-benefits through optimized irrigation and nitrogen management of hybrid maize in Northwest China," Agricultural Water Management, Elsevier, vol. 290(C).
    3. Hao, Baozhen & Ma, Jingli & Si, Shihua & Wang, Xiaojie & Wang, Shuli & Li, Fengmei & Jiang, Lina, 2024. "Response of grain yield and water productivity to plant density in drought-tolerant maize cultivar under irrigated and rainfed conditions," Agricultural Water Management, Elsevier, vol. 298(C).
    4. Pan, Xiaofan & Zhang, Hengjia & Yu, Shouchao & Deng, Haoliang & Chen, Xietian & Zhou, Chenli & Li, Fuqiang, 2024. "Strategies for the management of water and nitrogen interaction in seed maize production; A case study from China Hexi Corridor Oasis Agricultural Area," Agricultural Water Management, Elsevier, vol. 292(C).

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