1Agronomy Department, Northwest A&F University, Yangling, Shaanxi 712100, China.
2Research Center of Dryland Farming In Arid and Semiarid Areas, Northwest A&F University, Yangling, Shaanxi 712100, China.
3Institute of Water Saving Agriculture in Arid Regions of China, Northwest A&F University, Yangling, Shaanxi 712100, China.
4The Key Laboratory of Crop Production and Ecology in Dryland, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
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