棉花适时播种是实现一次播种保全苗的关键。过早播种并不早出苗,这容易因低温造成烂种烂芽。勉强出苗的棉苗不壮,病虫害多。过晚播种气温已高,茎叶生长过快,扎根浅,侧根少,不能培育出壮苗。具体播种时间,应根据当年当地的气候特点来定。如春季回暖的早晚、土壤墒情、霜的迟早及温度等,同时还要考虑地形、播种方式等情况。 Cotton timely sowing is the key to achieve a sowing seedlings. Premature sowing is not early seedlings, which easily lead to rotten buds caused by low temperature. Barely sprouted cotton seedling is not strong, pests and diseases and more. Sowing too late the temperature is high, too fast stem and leaf growth, rooting shallow, less lateral roots, can not cultivate strong seedlings. The specific planting time should be based on the local climate characteristics to be set. Such as the warmer morning and evening, soil moisture, sooner or later the frost and temperature, etc., but also to consider the topography, planting methods and so on.