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波尔多液对多种蔬菜病害有较好的防治效果,使用成本低、效果好,但若使用有当也可能产生药害,轻则减产,重则造成蔬菜死亡。使用波尔多液时要注意以下问题。 1.不同的蔬菜种类和生育阶段,应使用不同浓度的药液。蔬菜上使用波尔多液的浓度,一般为一份硫酸铜、一份生石灰、200份水。瓜类对石灰敏感,宜用一份硫酸铜、0.5份石灰、200份水以上。蔬菜在幼苗期对波尔多液的适应性弱,使用时浓度也应适当降低。 2.配制波尔多液的硫酸铜和生石灰的质量要好,硫酸铜应选择蓝色结晶,石灰应选择白色大块状。要现配现用,放置时间过长,发生沉淀,就变质失效。
Bordeaux mixture of a variety of vegetable diseases have a better control effect, the use of low cost, good effect, but if used may also have phytotoxicity, ranging from cut, while causing vegetable deaths. When using Bordeaux mixture should pay attention to the following questions. 1. Different types of vegetables and fertility stage, should use different concentrations of liquid. The concentration of Bordeaux mixture used on vegetables is generally one part of copper sulphate, one part of quick lime and 200 parts of water. Melons sensitive to lime, should be a copper sulfate, 0.5 lime, 200 parts of water above. Vegetables in the seedling adaptability of Bordeaux mixture weak, the concentration should also be properly reduced. 2. The preparation of Bordeaux mixture of copper sulfate and quicklime quality is better, copper sulfate should choose blue crystal, lime should choose white bulk. To be with the current use, placing too long, precipitation occurred, metamorphic failure.