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早春即苹果花期,北方苹果产区花极易遭受晚霜危害,此时应注意气象预报,以便及时预防。生产上常用的措施有: 1.薰烟,当气温降至2℃时,利用秸杆、野草、落叶菜燃烧物燃烧放烟,也可用防霜烟雾剂,配方是:硝铵20—30％锯末50—60％,废柴油10％和细煤粉10％,混合均匀后装入纸袋或容器内燃用。也可用赤磷燃烧法,即将赤磷放入小铁桶内点燃后,在果园内转几圈。 2.延迟生长:早春进行树干净白,可延迟萌芽和开花;树冠喷洒荼乙酸钾盐水溶液(每公斤水加入250—500毫升)或顺丁烯二酸酰肼M·H0.1—0.2％的水溶液,也可抑制萌动;萌动初期喷0.5％
Apple blossoms in early spring that the flowers in the northern apple-prone area are vulnerable to night frost. At this point, we should pay attention to the weather forecast for timely prevention. Production commonly used measures are: 1. Smoked, when the temperature dropped to 2 ℃, the use of straw, weeds, deciduous vegetables burning burning smoke can also be used anti-frost aerosol formula is: ammonium nitrate 20-30% 50-60% sawdust, 10% waste diesel and 10% pulverized coal, mixed evenly into paper bags or containers for internal combustion. Red phosphorus can also be used combustion method, the red phosphorus into the small iron barrel lit soon after the turn in the orchard a few times. 2. Delayed growth: early spring trunk white, delayed germination and flowering; Crown sprayed potassium acetate solution (500-500 ml per kilogram of water) or maleic hydrazide M · H0.1-0.2% Aqueous solution can also inhibit the germination; sprouting initial spray 0.5%