激素处理对野生观果树种坐果率和挂果期的影响

在花楸树盛花期喷50×10^-6赤霉素，可提高坐果率28．72％；喷PBO生长调节剂300倍液，可提高坐果率17．35％。在天目琼花盛花期喷50×10^-6赤霉素，可提高坐果率22．71％；喷PBO生长调节剂300倍液，可提高坐果率14．93％。以山杏、山梨为研究对象，在果实成熟前25d全株喷洒激素，在10×10^-6～50×10^-6范围内，随NAA和GA的增高，两个树种落果率明显下降，但均以30×10^-6～50×10^-6最为显著，落果率仅在10％以下，比对照下降了88．4％。

Affect on fruit setting rate and fruit bearing time of hormone treatment to fruit viewing trees

When 50 ×10^-6 gibberellin was sprinkled in full - blossom period, fruit setting rate of Sorbus pohua- shanensis （Hanee） Hedl. could increase by 9.5%, and the fruit setting rate could increase by 17.3.5% with 300 times liquid of PBO growth regulator. When 50 ×10^-6gibberellin was sprinkled in whole - plant full - blos- som period, fruit setting rate of Viburnum sargentiivar, calvescens could increase by 22.71%, and the fruit set- ting rate could increase by 14.93% with 300 times liquid of PBO growth regulator. With Prunus sibirica ,Pyrus serotina Rehd. cv. Hengshan as the research object, whole tree were sprayed with hormones 25d before the fruit mature , fruit setting rate of the two tree species were significantly decline with the rise of NAA and GA in the 10 ×10^-6-50 ×10^-6 test range, but 30×10^-6 -50 ×10^-6were the most significant, fruit abscission rate of these species were below 10% , were 88.4% lower than control.