近年来，制种地玉米常常发生秃顶、缺粒现象，一般可减产１０％以上，所以一直是制约制种玉米产量的主要因素。据调查：造成制种玉米秃顶缺粒的原因。一是养分供应不足，特别是缺钾地块，在穗分化期，一旦养分供应不足，就会造成部分小花不能发育，顶部迟分化的小花发生退化； In recent years, seed production of corn often balding, lack of grain phenomenon, the general reduction of 10% or more, it has been to restrict the main factor in the production of maize. According to the survey: the reasons for seedless corn bald. First, lack of nutrients, especially potassium-deficient plots in the spike differentiation period, once the lack of nutrient supply, it will cause some flowers can not develop, the top of the delayed division of the flower degeneration;