| Water supply and requirement of winter wheat and summer maize in Yangling |
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| DOI：10.7606/j.issn.1000-7601.2018.01.18 |
| Key Words: winter wheat-summer maize effective precipitation water demand water supply and requirement adaptation property Yangling demonstration zone |
| Author Name | Affiliation | | YAO De-long | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-ar
id of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water Conservation in Dryland, Yangling, Shaanxi 712100, China | | GAO Fan | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-ar
id of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water Conservation in Dryland, Yangling, Shaanxi 712100, China | | LI Zhi-jun | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-ar
id of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water Conservation in Dryland, Yangling, Shaanxi 712100, China | | HU Tian-tian | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semi-ar
id of Ministry of Education, Yangling, Shaanxi 712100, China
Institute of Water Conservation in Dryland, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Basing on daily precipitation from meteorological observation station of Northwest Agriculture and Forestry University in 1984—2015, the effective precipitation during growth stages of winter wheat and summer maize was calculated. The precipitation characteristics during the growing period of winter wheat and summer maize in Yangling demonstration area in recent 32 years were quantified by trend analysis and mathematical statistics. The results showed that the effective precipitation for winter wheat and summer maize was unstable. Winter wheat had the largest variation of effective precipitation during the emergence and winter stage with a coefficient of variation of 140%, followed by reviving jointing stage. The precipitation in this area is difficult to meet the requirement of wheat before winter and the jointing stage. The biggest variation was indentified at sowing and seedling stage. At jointing and grain filling stage, it is difficult to meet the water demand of maize. |
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