随着农业生产的发展,农民群众对良种的要求尤为迫切,良种的增产作用十分明显.但是,不少人由于对品种及品种利用缺乏科学认识,或者盲目追求使用高产品种,或者只注意品种的丰产性而忽视其抗逆性,虽付出极大的努力,却收到事与愿违的结果.必须认识到,任何一个优良品种都有它一定的适应地区和生产水平,存抗病、耐病、耐寒、耐旱、耐湿渍、抗干热风等抗逆性方面也不是全部具备的.所谓优良品种,在生产 With the development of agricultural production, the peasants’ demand for improved seed is particularly urgent, and the effect of improved seed production is obvious.However, due to the lack of scientific understanding of varieties and breeds, many people blindly pursue the use of high-yielding varieties or only pay attention to the variety However, despite great efforts, they have received unwilling results.We must recognize that any one of the fine varieties has its own level of adaptability to the region and the level of production, survival, disease resistance, cold tolerance, Drought tolerance, wet stain resistance, resistance to dry heat and other aspects of stress are not all have the so-called fine varieties, in the production