Abstract: Key climatic factors affecting peach-growth and its distribution, i. e., overwintering temperature, percentage of sunshine hour and rainfall during growing seasons, are selected to make fuzzy cluster analysis and to classify the regions of world's peach-growing areas. The results show that based on the average air temperature from December to February, world's major peach -growing areas can be classified into three types of regions characterized with cold(<3.0℃), temperate(3.0-10℃) and mild(>10℃) winter. And, based on the percentage of sunshine hour and rainfall from April to October, they are classified into three regions characterized with sufficient sunshine and dry (63-92%,<400mm), more sufficient sunshine and semi-humid (55-71%, 432-1001mm) and insufficient sunshine and humid(<55 %,717-1727mm). Most of world's peach yields are concentrated in the regions with sufficient sunshine and less rainfall during growing season and with not very cold winter. Within a range of suitable temperature, peach cultivars can be introduced from one region to another.

Key words: Peach, Ecotype, Climatic index, Fuzzy cluster analysis, controlled release urea, nitrification inhibitor, paddy field., annual greenhouse gas emission