Abstract
Correlations between total rainfall variation in growing seasons and yields (kg/10a) of Peach and Japanese Pear at 3 typical production Prefectures were examined, and approximate quadratic equations were derived for Japanese Pear.
Rainfall variations in Baiu seasons (much rain in June and July) and midsummer (little rain in August), which were closely related to fruits culture distribution and management, were analysed using the Quintile Grouping of rainfall data. Ratios of rainfall/potential evapotranspiration were derived and compared by distribution maps with fruits culture regions in normal year, more rainy year (once in 5 years level) and less rainy year (same above).
From the prospect of climatic change in near future, the author appointed that warmer temperature and activiation or going north of Baiu Front might cause earlier outburst of pests and diseases and intensification of midsummer drought, which necessitated sufficient irrigation fascilities and water.
