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一、空秆1、症状玉米空秆是指植株不结果穗或有果穗而无籽粒。目前玉米空秆率一般为5%~10%,严重者高达15%以上,是影响玉米产量的重要因素之一,一般空秆株在苗期基部为圆形,叶片发紫,顶端浓绿发紫,叶脉相间有白色透明的斑点或条痕,拔节期植株细弱矮小,叶片淡绿、窄长,与茎的夹角小。2、防治措施(1)确定合理密度。合理密植就是要因地制宜地增加单位面积种植株数,扩大绿色叶面积和根系的吸收面,有效利
First, empty stalks 1, the symptoms of corn stalks refers to the plant does not result in ear or ear and no grain. At present, the rate of empty corn stalk is generally 5% -10%, and in serious cases, it is more than 15%. It is one of the most important factors that affect corn yield. Generally, the stalk is round at the seedling stage, the leaves are purple and the top is dark green Purple, veins with white transparent spots or streaks, jointing plant thin and small, light green leaves, narrow and long, and the angle between the stem small. 2, prevention and control measures (1) determine the reasonable density. Reasonable close planting is to increase the number of plants planted per unit area to expand the green leaf area and root absorption surface, effective