| Research on drought assessment index of summer maize base on precipitation anomaly |
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| DOI：10.7606/j.issn.1000-7601.2012.03.42 |
| Key Words: summer maize trend yield meteorologieal yield drought index |
| Author Name | Affiliation | | LI Shuyan | He’nan lnstitvte of Meteorological Sciences,Zhengzhou,He'nan 450003,China
Key Laboratory of Agro-meteorological Safeguard and Applied Technique, CMA, Zhengzhou, He’nan 450003, China | | LIU Ronghua | He’nan lnstitvte of Meteorological Sciences,Zhengzhou,He'nan 450003,China
Key Laboratory of Agro-meteorological Safeguard and Applied Technique, CMA, Zhengzhou, He’nan 450003, China | | MA Zhihong | He’nan lnstitvte of Meteorological Sciences,Zhengzhou,He'nan 450003,China
Key Laboratory of Agro-meteorological Safeguard and Applied Technique, CMA, Zhengzhou, He’nan 450003, China |
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| Abstract: |
| The drought assessment index of summer maize was determined based on the relationship between precip-itation
and yield. Firstly, the history data series of yield were processed, trend yield was fitted using cubic polynomial, and the relative meteorological yield was detached; and then the relationship between precipitation anomaly in different growing phase and relative meteorological yield was analyzed. The result showed that precipitation anomaly from emer-gence to teaseling stage had significant positive correlation with relative meteorological yield. The regression equation was established through statistic analysis. The drought assessment index of summer maize in different grade was determined combined with division standard of agricultural drought. The index was: when negative precipitation anomaly was<20%,20%~50%,50%~80%,or>80%, the drought grade was slight drought, middle drought, heavy drought and serious drought, and the yield reduction was<10%, 10%~20%, 20%~30%, or>30%. |
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