| Study of soil drought of winter wheat field in Wanrong |
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| DOI：10.7606/j.issn.1000-7601.2013.02.42 |
| Key Words: soil drought drought index tillering |
| Author Name | Affiliation | | ZHANG Gaobin | Wanrong Meteorological Bureau, Wanrong, Shanxi 044200, China
Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China | | GUO Jianmao | Nanjing University of Information Science & Technology, Nanjing, Jiangsu 210044, China | | NING Jiandong | Wanrong Meteorological Bureau, Wanrong, Shanxi 044200, China | | FAN Chenggang | Wanrong Meteorological Bureau, Wanrong, Shanxi 044200, China |
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| Abstract: |
| The soil moisture change of winter wheat field in Wanrong is analyzed using the observed data from Wanrong meteorological station during the period of 1964—2008. soil relative humidity of plough horizon in
developmental stages showed a declining trend, especially in elongation heading period at rate of -4.9%/10a，the crop drought index Kd and the crop water deficit index G in elongation heading period also show soil drought signific
antly, and the increasing of tiller number in sowing-wintering and wintering-reviving lead to increasing crop coefficient. the soil drought is caused by precipitation (especially in summer) reduction, crop coefficient increased before and during wintering,the increasing reference crop evapotranspiration is caused by no-significant sunshine increase in April. All these reason leading to significant trend of soil drought in elongation heading period. |
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