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| Determination Method for the Insurance Rate of Meteorological Index of Cold Damage to Chinese Cabbage in Open Field |
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| DOI：10.16768/j.issn.1004-874X.2020.05.018 |
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| Abstract: |
| 【Objective】The study is to provide a scientific method for determining the insurance rate of cold damage to Chinese cabbage in the open field. It also has a reference to the determination of the insurance rate of other meteorological indexes, and provides assistance for the sustainable development of policyoriented agricultural insurance.【Method】The frost dates of the beginning and the end of each year（1957-2018）were converted into Julian days. Through calculation, the average frost dates of the beginning and the end of each year were obtained, which were set as the time thresholds for the cold damage index insurance, and the rationality of the threshold setting was tested by using the standard deviation classification method. The input costs of Chinese cabbage in various growth periods were counted accurately, and the compensation ratio was calculated according to the disaster damage rate. Through the calculation of occurrence probability, disaster damage rate and compensation ratio, the insurance rate of cold damage to Chinese cabbage in open field was obtained, and the weighted calculation for planting area was carried out to get the insurance rate of cold damage to Chinese cabbage in open field of planting area.【Result】The calculation method of the time and temperature thresholds for the freezing injury meteorological index insurance of Chinese cabbage in open field was designed, and the test method of the time threshold was established. The calculation method of three decisive factors of cold damage insurance rate -occurrence probability, disaster damage rate and compensation ratio was designed.【Conclusion】It is reasonable to set the average initial and final frost dates as the time thresholds for the cold damage meteorological index insurance of Chinese cabbage in the open field of Fengning Manchu Autonomous County. The damage rates of the Chinese cabbage in open field are 0.3, 0.7 and 1.0 when it suffers from the light, medium and heavy freezing injury. The highest compensation rate is 45% in the germination period, 75% in the seedling period and 100% after the rosette period. The insurance rate of the meteorological index of cold damage to Chinese cabbage in the open field of each town is 2%-3%, and the cold damage insurance rate in Fengning Manchu Autonomous County is 2.14% by weighted calculation. |
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