1. Key Laboratory of Crop Physio-ecology and Tillage Science in North-western Loess Plateau, Ministry of Agriculture / College of Agronomy, Northwest A&F University, Yangling, Shaanxi, China
2. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-arid Areas, Ministry of Education / Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, China