| Evaluation the influence of water deficit and irrigation on yield of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2012.02.18 |
| Key Words: winter wheat yield water Profit & Loss Index influence rate |
| Author Name | Affiliation | | CHENG Lin | Key Laboratory of Agrometeorological Safeguard and Applied Technique, CMA, Zhengzhou, He'nan 450003, China
He'nan Institute of Meteorological Science, Zhengzhou, He'nan 450003, China | | LIU Ronghua | Key Laboratory of Agrometeorological Safeguard and Applied Technique, CMA, Zhengzhou, He'nan 450003, China
He'nan Institute of Meteorological Science, Zhengzhou, He'nan 450003, China | | MA Zhihong | He'nan Institute of Meteorological Science, Zhengzhou, He'nan 450003, China |
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| Abstract: |
| Comparing the affect of water deficit and irrigation on yield in different growing stage of winter wheat has significant sense for water saving irrigation and drought influence assessment. Based on two years’ field water controlling experiments of winter wheat during 2008 and 2010, Profit & Loss Index (PLI), as well as Water Influence Rate (WIR) was introduced for analyzing the affect of water deficit and irrigation on final yield and yield’s structure in different growing stage. The results explained that: the most obvious period which drought and irrigation effected on yield structure and final yield didn’t appear at the same time. The wheatear number increased most at 0.14%/mm when irrigation between tillering and overwintering stage, however, decreased 0.32%/mm if lack of water during shooting～heading stage. Treatment of drought and irrigation in turning green～shooting stage and heading～grain filling stage conduced grain number per spike and mass of 1000 kernel varied greatly respectively. As for final yield, WIR was -0.33%/mm if water deficit during shooting～heading stage, while reached at 0.35%/mm if watering at turning green～shooting stage. |
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