地膜覆盖棉花播种后的出苗期,如果管理不善会出现冻苗、烫苗和干枯苗现象,造成缺苗减产。为了保全苗,发挥覆膜的优势,在出苗期要注意抓好“三防”。 1.防冻苗 无论哪种覆膜方式,都可能发生冻害死苗的现象。在先覆膜后播种的棉田,造成冻苗的主要原因是播得过早,霜前出苗,易受晚霜危害,造成死苗。因此不要盲目早播,应以霜前播种、霜后出苗为原则,避开霜冻危害。在先播种后覆膜的棉田,放苗前后都可能出现冻 Mulching cotton seedlings after seeding, if poor management there will be frozen seedlings, hot seedlings and dry seedling phenomenon, resulting in reduced seedlings. In order to protect the seedlings, play the advantages of plastic filming, pay attention to grasping the “three defenses.” 1. Antifreeze seedlings no matter what kind of filming, freezing phenomenon may occur dead seedlings. After the first sowing cotton fields, the main cause of frostbite is sowing too early, frost before emergence, vulnerable night cream hazards, resulting in dead seedlings. So do not blindly sow, should be sown before the frost, frost after emergence of the principle, to avoid the dangers of frost. Laminated cotton fields after the first sowing, Fangmiao may appear before and after freezing