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开孔放苗是地膜覆盖棉花苗全苗壮的重要措施。放苗既不可过早,又不可过晚,必须因苗情、天气而宜。一般应掌握“放绿不放黄,温差大了不能放”的原则,坚持“四放四不放”。即:晴天放苗,风天不放;放绿苗,不放黄芽苗;“闷热的阴天放苗,低温天气不放;上午下午放苗,炎热的中午不放等原则。低温、风天放苗,幼苗适应性差,易受低温影响感染苗病。
Open hole Fangmiao cover mulberry cotton seedlings all important measures. Fangmiao not too early, but not too late, must be due to the situation, the weather should be. Generally should grasp the “green put yellow, temperature difference can not be put,” the principle of “four letting go.” Namely: sunny day seedlings, weatherable; put green seedlings, letting yellow sprouts; "hot cloudy day Fangmiao, cold weather, letting go; morning afternoon, Fangmiao, hot at noon and wait for the principle of low temperature, wind The day of seedlings, seedling adaptability is poor, susceptible to low temperature infection disease.