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问;从气候特点看,玉米制种差膜育苗移栽有何必要性? 答:玉米自交系安全发芽出苗的温度是10—12℃,安全授粉温度不超过28℃。我地玉米制种最适宜的直播季节是3月底至4月初。但近年来气候反常,播种期间冷空气活动频繁,倒春寒比较严重,较长时间降小至中雨甚至大雨,比常年同期平均温度降低1—2℃左右,造成玉米亲本大量烂种缺苗;长时间持续春旱不雨,致使玉米自交系播后炕芽死苗严重;夏旱来得早,势头猛,高温伏旱造成玉米雌穗不
Q; From the climatic characteristics of see, corn seedling poor film transplanting what is the need? A: Inbred corn sprouting budding temperature is 10-12 ℃, safe pollination temperature does not exceed 28 ℃. The most suitable live seeding season for maize seeds is from late March to early April. However, in recent years, the climate is anomalous. Cold air activities are frequent during sowing, cold in late spring is relatively severe, long time is reduced to moderate or heavy rain, which is about 1-2 ℃ lower than the average temperature of the same year. The time lasted, the spring did not rain, resulting in maize inbred lines sowing kang bud dead serious; early summer drought, momentum Meng, high temperature and drought caused maize ear does not