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无论在夏玉米地里还是在春玉米地里,我们都能看到一些植株长得根深叶茂、秸壮穗大;另一些植株却长得矮瘦黄弱,有的穗子很小,还有的干脆成了空秆,对产量影响很大。这种个体生长不平衡的现象,群众称之为大小株。据调查,以低于一般植株高度1尺以上、穗粒数少于200粒作为小株计,一般玉米地小株占15%左右,夏玉米尤以套种玉米小株率最高,一般达30%以上。平均每亩减产13.4%。
In both summer and spring corn fields, we can see that some plants grow in deep roots and have thick stalks and spikes. Others are thin and weak, others have small ears, Simply become empty stalks, a great impact on the yield. This phenomenon of uneven growth of individuals, the masses called the size of strains. According to the survey, less than the general plant height of more than 1 foot, less than 200 grains per spike as a small plant, the general maize accounted for about 15% of small plants, especially summer maize interplanted corn plant the highest rate, usually up to 30% the above. The average yield reduction of 13.4% per mu.