“科技兴农,种子先行”。正确选用和引进作物品种,是夺取农业优质高产最经济有效的措施。要获得农作物良种的选用和引种成功,必须掌握好以下技术要领: 一、弄清品种的生育特点和适应性一个优良品种都有一定的生育特性和适宜的种植区域。只有从适宜地区和相似的气候条件的地方引进才易获成功;若两地的生态条件相差悬殊,引种是难以成功的。如短日照、喜温作物水稻,从南方引种到北方后,由于北方温度低、日照长,往往表现生育期延长甚至不能成熟。对于长日照的冬 “Science and agriculture, seed first”. The correct selection and introduction of crop varieties is the most economical and effective measure to seize the high quality and high yield of agriculture. To get the selection of crop seeds and the introduction of success, we must master the following technical essentials: First, to understand the characteristics of reproductive characteristics and adaptability of a good variety has a certain characteristics of fertility and suitable planting areas. It is easy to be successful only when introduced from suitable areas and similar climatic conditions; if the ecological conditions of the two places are very different, the introduction is difficult to succeed. Such as short sunshine, hi temperature crop rice, introduced to the north from the south, due to the northern low temperature, long sunshine, often the performance of the growth period can not even mature. For long sunshine winter