“种”是农業“八字宪法”組成之一,是农業生产上最經济最有效的增产技术措施之一。在同样的生产条件下,如果换用良种就能获得較多的产量。良种的增产作用,在一定程度上,是其他增产措施不容易代替的。一般优良品种的区域适应性較广,在一地育成的新品种,一般能适应較大的地区,如在陕西省武功县育成的碧螞一号小麦能适应于陝西关中地区以及河南、山东、山西、河北等省广大麦区。有些特殊问题,如病、虫、寒、旱、碱、縮短生長期 “Seed” is one of the components of the “Eight Character Constitution” of agriculture and one of the most economical and effective stimulation technologies in agricultural production. In the same production conditions, if you switch to good seed can get more output. The effect of seed production is to some extent not easily replaced by other stimulation measures. Generally good varieties of the region more widely adaptable, new varieties bred in one place, generally able to adapt to larger areas, such as in Shaanxi Province Wugong County batima wheat bred to adapt to Shaanxi Guanzhong region and Henan, Shandong, Shanxi, Hebei and other provinces vast wheat area. Some special problems, such as disease, insects, cold, drought, alkali, shorten the growth period