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于1970和1971年的1月与7月份最后一周内,将17龄的Safeda品种番石榴果树喷施三种生长调节剂,即GA,2,4—D及2,4,5—T,每种药液浓度均为20ppm与40ppm.并作空白对照.试验结果表明,除2,4,5—T 20ppm外,其余各处理均使番石榴在顶芽长度、叶片数、单枝叶面积、单枝花数、果径、果重以及产量等超过对照,且在果质特征即TSS值、还原糖与非还原糖浓度及抗坏血酸与果胶含量等诸方面亦得到改善;但大大缩短了开花时间,并大幅度降低了落果率与果实酸度.所有处理中GA40ppm在各个方面的效果最佳.
During the first week of 1970 and 1971 and the last week of July, three growth regulators, namely GA, 2,4-D and 2,4,5-T, were sprayed on the 17-year-old Safeda variety guava fruit trees The concentration of the solution were 20ppm and 40ppm, and as a blank control.Experimental results show that, in addition to 2,4,5-T 20ppm, the rest of the treatment are guava in the top bud length, leaf number, single leaf area, single The number of branches, fruit diameter, fruit weight and yield exceeded the control and were also improved in terms of fruit quality characteristics such as TSS value, reducing and non-reducing sugar concentrations and ascorbic acid and pectin content; however, the flowering time , And greatly reduced the fruit drop rate and fruit acidity. GA40ppm in all treatments was the best in all aspects.