对苗圃土壤进行消毒,消灭其中的病菌,是确保苗木正常生长,减少苗期病害的重要措施。苗圃土壤消毒常用的有以下六种: 一、福尔马林消毒法:每平方米苗圃地用福尔马林50ml加水10kg均匀地喷洒在地表,然后用草袋或塑料薄膜覆盖,10天后揭除覆盖物,促使气体散发掉,2天后即可播种或扦插。该方法对防治立枯病、褐斑病、角斑病、炭疽病等有良好的效果。二、高锰酸钾消毒法:对于扦插地苗床,可采用0.5%的高锰酸钾均匀喷布扦插基质表面,每平方米用药液0.5kg,使药液充分渗入基质,即可有效杀灭基质(土壤)中存在的杂菌,对防治苗木根系病害有较好效果。三、波尔多液消毒法:每平方米圃地用等量式(即:硫酸铜:石灰:水的比例为1:1:100)波尔多液2.5kg喷洒土壤,待土壤稍干即可播种扦插。对防治黑斑病、斑点病、灰霉病、锈 Disinfection of the soil in the nursery, which eliminate the germs, is to ensure the normal growth of seedlings, reduce seedling disease is an important measure. Commonly used in soil disinfection nursery have the following six: First, the formalin disinfection: square meters of nursery with formalin 50ml water 10kg evenly sprayed on the ground, and then covered with grass bag or plastic film, 10 days after the expose In addition to covering, to promote the gas emitted, 2 days after sowing or cutting. The method has the good effects of preventing and controlling the blight, brown spot, angular leaf spot, anthracnose and the like. Second, potassium permanganate disinfection method: For cutting seedling bed, 0.5% potassium permanganate can be used uniformly spray the surface of the cutting substrate, 0.5kg per square meter of liquid medicine, so that the full penetration of the liquid matrix, you can effectively kill Exterminate the matrix (soil) in the presence of the bacteria, the prevention and treatment of seedling root disease has a good effect. Third, Bordeaux mixture disinfection method: every square meter nursery with the same amount (ie: copper sulfate: lime: water ratio of 1: 1: 100) Bordeaux mixture of 2.5kg spray soil, until the soil is slightly dry to sow cutting. On the prevention and treatment of black spot disease, spot disease, gray mold, rust