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本文探讨了油松施氮肥后的抗虫效应。1981—1983年试验油松每年以两种方法施尿素5次。根施尿素每次用量为0.1和0.2公斤/株或采用重量比是1:200的尿素溶液进行叶面喷雾。实验结果如下:(1)枯梢率低于对照树;(2)松大蚜、松梢螟和红蜘蛛的虫口数量减少;(3)树皮和树叶中的总氮量、粗纤维素、粗灰分含量增加,而可溶性糖含量下降。经统计分析,上述结果和对照树相比有显著差异。结果表明,施氮肥不仅会增强树势,还会增强树的抗虫性而减轻虫害。我们认为,其主要作用机理是树木营养成分的明显改变影响了昆虫的生长发育和繁殖。
In this paper, we discussed the insect-resistant effect of Pinus tabulaeformis N fertilization. 1981-1983 Test Pinus tabulaeformis two times per year urea applied five times. Root application of urea each time the amount of 0.1 and 0.2 kg / strain or the use of urea weight ratio of 1: 200 foliar spray. The results are as follows: (1) The rate of shoots was lower than that of the control tree; (2) The number of the population of Pinus sylvestris, Pinctomyces mongoochi and Spider mites decreased; (3) The total nitrogen content in bark and leaves, crude cellulose, Crude ash content increased, while soluble sugar content decreased. After statistical analysis, the above results are significantly different from the control tree. The results showed that nitrogen fertilizer could not only enhance the tree vigor, but also enhance the pest resistance of the tree and reduce pest. In our opinion, the main mechanism of action is that significant changes in the nutrient composition of the tree affect the growth and reproduction of insects.