一个世纪以来,育种工作者育出的小麦新品种,通过提高生产力和改进耕作方法,使产量水平提高了3.5倍(1851～60年平均产量为1467公斤/公顷;1973年5400公斤/公顷),最新育成的高产品种荷兰春麦比墨西哥矮杆品种 HYVs 增产1.5倍。例如上个世纪在美国发现的一个叫“方穗”的不著名的小麦品种,它具有穗码密、茎秆矮、根系集中等特点,与一般小 For a century, the new wheat varieties breeded by breeders raised their output by 3.5 times (by 1467 kg / ha in 1851-60 and 5400 kg / ha in 1973) by increasing productivity and improving farming practices, The newly bred high-yielding Dutch spring wheat was 1.5 times more fertile than the Mexican short-stem hybrid HYVs. For example, in the last century in the United States found a “square spike ” not famous wheat varieties, it has spike code dense, short stalks, roots and other characteristics of the concentration, and the general small