A MODEL TO PREDICT FRUIT-GROWTH FROM SOLA R-RADIATION AND TEMPERATUREDATA FOR JAPANESE PEAR

To explain and predict the relation between weather and fruit growth i n Japanese pear(Pyrus pyriforia Nakai, cv. Kosui), a model was constru cted based on solar radiation and field growth data obtained from seve ral regions in Japan. As a result of simulation, the following equatio n applicable to the estimation of the fruit growth under usual and unu sual weather in every region was formulated. [GRAPHICS] where Vx is es timated fruit volume at x days after flowering, V-33 is observed fruit volume 33 days after flowering, kn is parameter indicating seasonal c hange in the influence of Sd, Sd is observed daily solar radiation, p = 0.580 and b = 0.639. Transverse diameter of fruit at x days after fl owering (wx) can be estimated from the following equation. [GRAPHICS] them carried specific fragments derived from 'Hazzara (Abohar)'. Other s, however, carried specific fragments derived from both parents. Poss ible causes for such band patterns are discussed from a genetical view point.