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1 造成制种玉米秃顶、缺粒的原因 1.1 养分供应不足,特别是缺钾的地块。穗分化期,是营养生长和生殖生长的最快时期,需要的养分最多,如果养分供应不上,造成部分小花不能发育,顶部迟分化的小花因养分不足发生退化。 1.2 单交种父母本是自交系,生长势一般都很弱。自交系植株(父母本)一般比较矮小,种子小,顶土力差,果穗也小。
1 Cause bald head of seed production, lack of grain reasons 1.1 nutrient shortage, especially potassium-deficient plots. Spike differentiation period is the fastest vegetative and reproductive growth period, the nutrients needed most, if the nutrient supply is not on, resulting in some flowers can not develop, the late late differentiation of flowers due to nutrient deficiencies degenerated. 1.2 Single cross This is a self-bred parent, growth potential is generally weak. Inbred lines plants (parents) are generally relatively short, small seeds, top soil is poor, ears are small.