Water-Salt Thresholds of Cotton ( Gossypium hirsutum L.) under Film Drip Irrigation in Arid Saline-Alkali Area

Yunfeng Li, Quanqing Feng, Dongwei Li, Mingfa Li, Huifeng Ning, Qisheng Han, Abdoul Kader Mounkaila Hamani, Yang Gao and Jingsheng Sun ()
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Yunfeng Li: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Quanqing Feng: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Dongwei Li: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Mingfa Li: Xinjiang Production and Construction Corps First Division Water Saving and Irrigation Test Station, Alaer 843300, China
Huifeng Ning: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Qisheng Han: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Abdoul Kader Mounkaila Hamani: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Yang Gao: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China
Jingsheng Sun: Key Open Laboratory of Crop Water Requirement and Regulation, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China

Agriculture, 2022, vol. 12, issue 11, 1-21

Abstract: Crop models are valuable tools for exploring the responses of crops to changes in environmental factors, and have been widely used to analyze the response of crops to varying soil water content and salinity levels in extreme drought and high salinity conditions. To obtain suitable water-salt thresholds and the total irrigation amount for cotton in the arid oasis of southern Xinjiang, the AquaCrop model was calibrated and validated using measured data from 2020 and 2021 (total irrigation amount: 255–480 mm; initial soil salinity levels: 0.2–0.6%). With the same initial soil water content, when the initial soil salinity < 7 dS/m, cotton yield did not significantly change under different levels of total irrigation amount, while when the initial soil salinity was 10 dS/m, there was a significant difference in cotton yield with a total irrigation amount > 300 mm. The total irrigation amount of 375 mm is the threshold for cotton at the low-salinity treatment, while it increases to 450 mm at the high-salinity treatment. Based on cotton performance with the AquaCrop model, the threshold values of soil salinity were 7, 9.3, 8.2 and 9.3 dS/m ( EC e ) during the cotton stage of seedling, squaring, flower-boll and maturity, respectively. The total irrigation amount of 450 to 500 mm could achieve a win-win scenario for both cotton yield and water use efficiency under sandy loam soil. In summary, this study can serve as a reference for regulating water and salt in arid saline-alkali regions.

Keywords: AquaCrop; cotton; simulation; soil salinity; soil water (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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