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桃树叶面施用生长调节剂促使改变一年生新梢的耐寒性其结果是不理想的。乙烯利施用浓度在1000—1500PPM时对桃树嫩枝是有害的。矮壮素施用浓度在1000PPM时桃树的耐寒性稍有提高。7月底喷射树梢引起生长期受抑制;加速秋季落叶因而改变发展耐寒性。丁酰肼和脱落酸产生的效应不能确定,其结果取决于不同的施药时间。通常表明:喷以丁酰肼和脱落酸后在抑制生长对树的落叶和耐寒性的发展之间并无显著的相关。初步结果看出:用丁酰肼、脱落酸和矮壮素喷射桃树嫩枝后木质素的含量增加了。
Peach foliar application of growth regulators prompted changes in the annual cold tolerance of young shoots and the result was not ideal. Ethephon at concentrations of 1000-1500 PPM is harmful to peach shoots. Chlormequat slightly increased the cold tolerance of peach trees at 1000 PPM. Spraying the treetops at the end of July caused the growth phase to be inhibited; accelerating the fall of autumn leaves changed the development of cold tolerance. The effects of butyrohydrazide and abscisic acid can not be determined and the results depend on different application times. It is generally indicated that there is no significant correlation between the suppression of growth and the development of tree deciduous and cold tolerant after spraying with butanhydrazide and abscisic acid. The preliminary results showed that the content of lignin increased after the shoots were sprayed with butyryl hydrazine, abscisic acid and chlormequat.