| A method for evaluating impact of dry\|hot wind on 1000-kernel weight of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2022.02.25 |
| Key Words: dry\|hot wind 1000\|kernel weight wheat grain filling stage photosynthesis dynamic assessment |
| Author Name | Affiliation | | CHENG Lin | CMA·Henan Agrometeorological Support and Applied Technique Key Laboratory, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Science, Zhengzhou, Henan 450003, China | | ZHANG Zhihong | CMA·Henan Agrometeorological Support and Applied Technique Key Laboratory, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Science, Zhengzhou, Henan 450003, China | | HU Chengda | CMA·Henan Agrometeorological Support and Applied Technique Key Laboratory, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Science, Zhengzhou, Henan 450003, China |
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| Abstract: |
| In order to estimate scientifically the influence of dry\|hot wind on 1000\|kernel weight of winter wheat and assist in agricultural disaster prevention and mitigation, conceptual models of leaf photosynthesis and dry matter accumulation was adopted, and dry\|hot wind control tests were carried out at Zhengzhou Agrometeorological Experimental Station in years of 2010-2011，2011-2012 and 2013-2014. To evaluate quantitatively the impact of dry\|hot wind on 1000\|kernel weight, the relationship between different intensity of the hazard and stress degree of photosynthetic rate of winter wheat leaves was analyzed and the photosynthesis rate influenced by dry\|hot wind was revised. The results showed that the rate of leaf photosynthesis was reduced by 0.66%~36.62% under different degrees of the hazard. Daily maximum temperature was the most critical factor causing the stress.In normal years, typical years of dry\|hot wind and under field experimental conditions, the average accuracy of simulated 1000\|kernel weight by the evaluation model was higher than 95%, and the relative error was less than 4.5%. By calculating the difference between a hypothetic ideal 1000\|kernel weight and the measured value during the recent years at representative stations, the analysis indicated that the loss of 1000\|kernel weight was about 1~2 g and the loss of the final yield was 0~5% when the light hazard of dry\|hot wind lasted 1~2 days during the early middle stage of grain filling or approaching harvesting. In other stages, the loss of 1000\|kernel weight was 1~7 g, and the yield reduction rate reached to 12%~18% under serious hazard condition. This method for evaluating the impact of dry\|hot wind has a certain applicability, as it can objectively and dynamically assess the effects of dry\|hot wind on grain weight during the different grain filling stages. |
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