| Relationship between water use of subsoil and wheat yield and yield stability in dryland wheat on the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2023.03.07 |
| Key Words: winter wheat subsoil water utilization yield stability water use efficiency dryland agriculture Loess Plateau |
| Author Name | Affiliation | | YANG Wenjia | Co\|construction by Ministry and Province), College of Agriculture, Yangtze University, Jingzhou， Hubei 434025, China； Institute of Soil and Water Conservation, State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China | | XIAO Qinghong | Agricultural Comprehensive Development Center of the Department of Agriculture and Rural Affairs of Ningxia Hui Autonomous Region, Yinchuan, Ningxia 750000， China | | WANG Shiwen | Institute of Soil and Water Conservation, State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China
Chinese Academy of Sciences/Ministry of Water Resources, Yangling，Shaanxi 712100, China | | WEI Wei | Agricultural Comprehensive Development Center of the Department of Agriculture and Rural Affairs of Ningxia Hui Autonomous Region, Yinchuan, Ningxia 750000， China | | YIN Lina | Institute of Soil and Water Conservation, State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China
Chinese Academy of Sciences/Ministry of Water Resources, Yangling，Shaanxi 712100, China | | DENG Xiping | Institute of Soil and Water Conservation, State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China
Chinese Academy of Sciences/Ministry of Water Resources, Yangling，Shaanxi 712100, China |
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| Abstract: |
| The Loess Plateau of China is a typical dryland area and winter wheat is one of the major cereal crops on the Loess Plateau. How to further increase wheat yield as well as maintain the yield stability is a crucial issue that needs to be addressed urgently in this region. Wheat production is profoundly affected by the utilization of soil water due to the region’s erratic precipitation and the mismatch between the rainy season and the winter wheat growing season. We collected the data from published studies on the Loess Plateau and found that large amounts of available soil water remain in soil layer at harvest time. We further analyzed the relationship between grain yield of winter wheat and soil water utilization. The results showed that at wheat harvest time, grain yield was 2 640~4 920 kg·hm-2 when the residual subsoil water storage (RSWS) was 100~130 mm, and it was increased to 5 250~6 576 kg· hm-2 when the RSWS was 30~70 mm. Furthermore, the probability of high grain yield was enhanced by increasing the utilization of subsoil water. When the RSWS reduced from (270~210 mm) to (150~90 mm) mm, the probability of yield exceeding 4 000 kg·hm-2 or 5 000 kg·hm-2 was increased from 6% to 92% or 1% to 66%, respectively, under 666~766 mm WS (water supply during the growing season and the sum of soil water storage in 0~200 cm and growing season precipitation) condition. The probability of yield exceeding 5 000 kg·hm-2 or 6 000 kg·hm-2 was increased from 14% to 99% or 1% to 41%, respectively under ＞766 mm WS condition. In addition, we discussed how to increasing subsoil water utilization by variety and agronomic practices and exemplified the feasibility of enhancing yield and water use efficiency by increasing subsoil water utilization through the improvement of agronomic practices. |
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