种子活力即种子健壮度,它包括发芽潜力、生长潜势和生产潜力。玉米单交种子粒大、胚大、胚部脂肪含量高达33%,在贮藏过程中较易生霉、发热和酸败,使种子生活力降低。因而种子公司不怒保存陈种子,怕霉烂变质或转商亏损。但玉米生产每年受气候条件影响较大,特别是华北地区,播种后因干旱不能出苗或出苗后旱死的现象经常发生,必须重播。为适应生产所需,对玉米种子不能不留有一定贮备。这就需要对玉米单交种子,在北方一般 Seed vigor is seed vigor, which includes germination potential, growth potential and production potential. Single seed corn grain size, large embryo, embryo fat content as high as 33%, during storage more susceptible to mold, fever and rancidity, so that seed viability decreased. So the seed company does not anger save Chen seed, fear of rotten or deteriorating business losses. However, the annual maize production is greatly affected by climatic conditions, especially in North China. It is not uncommon for maize plants to emerge or die dry after sowing due to drought and must be replayed. In order to meet the needs of production, corn seeds can not help but have a certain reserve. This requires a single cross-seed corn, in the north general