Research Reports
A study on the computation of standard yield for Chestnut Insurance Program
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AuthorLee, Sangmin
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Publication Date2005.12.01
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Original
The chestnut farmers were suffered from two consecutive typhoons in 2002 and 2003. The demand for the insurance program gets stronger recently. Standard yield is one of the most important materials for crop insurance and it is a basic data to calculate the insured amount and the premium. Consequently, stability of insurance program heavily depends on the accuracy of standard yield.
The purpose of this study is to calculate standard yield as close as the real state to help successful introduction of chestnut insurance program. The subject areas surveyed for the study are focused on the main chestnut-producing districts such as Sanchung, Gwangyang, and Gongju.
Three different kinds of data have been utilized for estimation, and two of them were mainly used for the final calculations. The method of cultivation, trimming, is one criterion to divide producers into two groups. Averaged production amount of unit area or unit tree for each age was set to be a standard yield. It requires, however, one or two steps of adjustment to be applicable to the real program. Adjustment criteria include the sample size of each age and the consistency of production with neighbor ages. The final results for Sanchung and Gongju were good enough for practical application to the insurance program, but for Gwangyang the scale of yields between 2002 and 2005 were too different to be averaged. And standard yield of 2002 would be proper to be used at the beginning stage of the program.
To improve the calculated standard yield, continuous surveys for the areas as well as other important producing districts are needed. Experimental studies of the young ages are also required for the newly planted trees, which will keep changing the age structure of a field every year. Once the insurance program is adopted, personal records for the output should be used for estimating personal yield rather than the standard yield of municipalities.
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