在调查了解发现，当前夏玉米生产中存在着四个不容忽视的问题，成为夏玉米高产和再高产的限制因素。现就有关情况分述如下： 选种不慎重 由于目前种子良繁体系尚不够完善，不合格的玉米种子仍占有较大比例。部分农民“贪图便宜”的心理在作怪，而从小商贩或不正规的种子经营部 In the survey found that the current summer maize production there are four problems that can not be ignored as a summer maize high yield and then high yield constraints. Now the relevant points are as follows: Selective careless Because of the current system of seed propagation is not yet perfect, unqualified corn seeds still account for a large proportion. Some peasants are “trying to be cheaper” psychology at play, and from small traders or irregular seed management department