Studies on the Regional Distribution of the Main Superior Pear Cultivars and Their Optimum Ecological Indexes in China

In this paper a datum base was estabilished by a microcomputer system and dABSE III using ecological date collected from the areas of the main superior pear cultivars which were appraised by the Ministry of Agriculture through twice nationwide comparisions during the 1980s.The proprtion of productions,geographical distribution and optimum ecological indexes of the main superior pear cultivars were evaluated according to the statistical analysis of the data.The ecological adaptability of the cultivars were also analysed.Furthermore,a regional assignment and production planning were discussed with suggestions given for the national programme to adapt those cultivars in future.