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一、品种的类型及其应用生产上使用的品种可分为两大类型,即广泛适应性和特殊适应性品种。广泛适应性品种一般对外界环境条件的变化有一定的自动调节能力,所以适应范围较宽,在环境条件变化时产量仍较稳定,故亦称为大面积丰产品种。这类品种的特点是:(1)适宜播期较长,早播7～10天不致发生严重冻害,晚播10～15天产量也不会大幅度下降。(2)对肥水条件的适应范围也较宽,在肥力高的地块种植不易倒伏,一般亩产可达350～400公斤甚至更高;在肥力较低的地块种植也能适应;遇上稍旱的年份也不致严重影响产量;一般亩
First, the type of variety and its application The varieties used in production can be divided into two types, namely, a wide range of adaptive and special adaptable varieties. Widely adaptable varieties generally have certain automatic adjustment ability to the change of external environmental conditions, so the adaptable range is wide, and the output is still stable when the environmental conditions change, so it is also called large-area and high-yielding variety. The characteristics of these varieties are: (1) suitable sowing longer, early sowing 7 to 10 days will not occur serious frost damage, late sowing 10 to 15 days yield will not significantly decrease. (2) The range of adaptability to fertilizer and water conditions is also wide. It is hard to lodging in plots with high fertility, generally yielding up to 350-400 kg per mu and even higher in plots with low fertility. A little dry years will not seriously affect the yield; general mu