| The meteorological conditions in apple flowering and fruit phase and fruit setting ratio data since the middle 1980's as well as the influence of climate warming on apple flower and fruit dropping were analyzed.The results showed that the main influencing factors were high temperature during flowering phase, interval low temperature during flowering and fruit phase and dry climate.In this region the most suitable temperature of the flowering phase to fruit setting was 14.0～21.0℃.After full blossom,if the daily average highest temperature of 1～2 d、1～3 d、1～4 d exceeded 29.0℃、27.0℃、26.0℃,respectively,the daily average lowest temperature was below 5.0℃,and the air relative humidity was below 56%,quality debasement of pregnant flower and sterility would happen.Finally,the comprehensive countermeasure was put forward. |