玉米因空秆、缺粒、秃顶减产5～10％，严重的可达20％。一、发生原因1、营养物质供应不足。玉米吸肥力较强，需肥量大，营养物质不足，就会增加空秆、缺粒秃顶率。如氮素肥料供应不足，则造成叶绿素形成少，光合作用减弱，植株体内碳水化合物减少，不能满足果穗分化时期对营养 Corn stalks due to empty, lack of grain, bald cut 5 to 10%, severe up to 20%. First, the causes 1, nutrient supply shortage. Strong absorption of corn fertilizers, large amount of fertilizer required, lack of nutrients, it will increase the empty stalk, lack of bald rates. If the supply of nitrogen fertilizer is insufficient, then the formation of less chlorophyll, photosynthesis weakened, reduce the body of carbohydrates, can not meet the ear during the differentiation of nutrition