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本试验的目的是进一步测定二硝邻甲酸钠、萘乙酸钠和西维因对“大久保”桃的疏花疏果的效应并试测敌百虫作为桃的疏除剂的可能性。萘乙酸钠由于浓度低,疏除无效。西维因对“大久保”桃不起疏果作用,这同我们1963年的试验结果相同。敌百虫虽然对苹果似乎有疏果的作用,但在本试验中无效。 在所用的四种药剂中,只有二硝邻甲酚钠表现明显的疏除效应,在60%和100%的花开放时喷射浓度为0.2%和0.4%的药液,达到了与人工疏果相近似的水平。但果实的重量和大小却显著地小于人工疏果的对照,这主要是因为二硝邻甲酚钠处理的总的落果率中,有一半以上是在人工疏果的日期之后脱落的,削弱了疏果对果实生长的促进作用。二硝邻甲酚钠的药害,与1963年观察到的相同,但程度较为严重。 讨论了影响疏除效应和药害的一些因子,包括喷药前后的气温、相对湿度、药液浓度、树势、遮阴、花芽百分数和主枝周径每厘米的花芽数等。
The purpose of this experiment was to further determine the effects of sodium dinitrate, sodium naphthaleneacetate and civireine on the thinning and thinning of “Okubo” peach and to test the possibility of trichlorfon as a peach spreader. Sodium naphthalene because of low concentration, sparse effect is invalid. The use of XVI for the “Okubo” peach does not play a role of fruit thinning, which is the same as our 1963 test. Trichlorfon, although apparently apathetic to apple, is not effective in this trial. Of the four agents used, only sodium dinitro-o-cresyl had a significant effect of sparseness, sprayed at a concentration of 0.2% and 0.4% at 60% and 100% of flower opening, Similar level. However, the weight and size of the fruit were significantly less than those of the artificial fruitless fruit control mainly because more than half of the total fruitlessness rate of sodium dinitration o-cresol fell off after the artificial fruitless date and weakened The effect of thinning on fruit growth. The toxicity of sodium dinitro-o-cresyl was the same as that observed in 1963, but to a greater extent. Some factors affecting the sparse effect and phytotoxicity were discussed, including air temperature before and after spraying, relative humidity, liquid concentration, tree vigor, shading, percentage of flower buds and number of flower buds per centimeter of main branch circumference.