在海拔3.250米以上,全年平均气温仅5.5℃,无霜期才128—140天的湞西北高原培育云、冷杉苗,有其特殊性,技术管理上需把好五关: 一是把好消毒关。对幼苗危害最重的常是猝倒病、立枯病和金龟子幼虫、而这些病原菌和害虫又生活于土壤中,因此应做到预防为主,防治结合。要求在做床前先用0.5％的敌敌畏喷洒两遍並翻耙土块:然后在土壤中混入五氯硝基苯加代森锌(75:25),每亩用量1—1.2公斤,混入表土层15厘米以内,搅拌均匀,方可做床。播种时对种子、床 In the 3.250 meters above sea level, the annual average temperature of only 5.5 ℃, frost-free period of 128-140 days of 浈 cultivation of clouds, fir seedlings, has its own particularity, technical management should be a good five: First, the good disinfection . Often the most damaging to seedlings is damping-off disease, damping-off disease and beetle larvae, and these pathogens and pests live in the soil again, so prevention should be the main prevention and treatment combination. Requires that 0.5% dichlorvos be sprayed twice before turning bed and rake soil block: then mixed in the soil with pentachloronitrobenzene plus dexamethasone (75:25), the amount of 1-1.2 kg per acre, mixed into the top soil 15 cm or less, stir well before making a bed. Sowing seeds, bed