两种化学药剂对银杏果实疏除效应的研究

Study on Fruit Thinning Effects of Two Types of Chemical Reagents on Ginkgo

银杏结果过多会严重影响树体的生长,为控制银杏过多结果,在不同时期对树体喷洒不同浓度的乙烯利和石硫合剂,并在试验前后对土壤的pH值、有效N、速效P、细菌、真菌、放线菌进行测定。结果表明,在花期喷洒不同浓度的乙烯利和石硫合剂,可以控制果实的形成,乙烯利浓度以400、800 mg/kg为佳,浓度为1 200 mg/kg时会出现药害,喷洒石硫合剂0.5%、1%的效果较好;在果期喷洒乙烯利和石硫合剂,对果实的形成影响不大,对果实的重量、大小有一定的影响,喷洒药物后,土壤的pH值稍有增加,有效N、速效P降低,细菌、真菌、放线菌数量降低。

Excessively high fruit-bearing rate will seriously affect the growth of ginkgo trees. In order to control fruit-bearing ot ginkgo, dltterent concentrations of ethephon and lime sulphur were sprayed on ginkgo trees at different stages. Soil pH, available N, rapidly available P and the number of bacteria, fungi and actinomycetes were determined before and after the experiment. According to experimental results, spraying different concentrations of ethephon and lime sulphur at anthesis stage could control the formation of fruit; spraying 400 and 800 mg/kg ethephon exhibited the best effect, while spraying 1 200 mg/kg ethephon resulted in phytotoxicity; spraying 0.5% and 1% lime sulphur exhibited good effect. However, spraying ethephon and lime sulphur at fruiting stage had little effect on the formation of ginkgo fruit, but possessed a certain effect on the weight and size of ginkgo fruit. After spraying chemical reagents on ginkgo trees, soll pH increased slightly ; available N, rapidly available P and the number of bacteria, fungi and actinomycetes were reduced.