Abstract:

The growth process of middle rice is affected by many agro-climatic factors, so to describe its production is extremely complex. In order to reduce the interaction between climatic factors, quantitative description of the climatic factors on middle rice yield. The author used the differential forms of multifactor regression integral, established the prediction model of weather yield of middle rice. Comprehensive description of the model of temperature, precipitation, sunshine and other weather factors on the impact of middle rice yield, and also designed yield index, a measure of the impact of the climatic factors in growing period of middle rice on the final yield. The results showed that the largest elements of climatic change on rice yield in Zigong were temperature in early March which can cause fluctuations in the output of 136.7 kg/hm2; precipitation in mid-June which can cause fluctuations in the output of 163.7 kg/hm2; sunshine in mid-July which can cause fluctuations in the output of 94.4 kg/hm2. The temperature in late May, the precipitation in early July and the sunshine in early March can cause fluctuations in the output between 89.6 kg/m2 and 131.5 kg/m2.