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玉米是河南省仅次于小麦的主要秋粮作物,具有杂种优势强,增产潜力大,综合利用途径多,经济效益高等优点,是进一步提高粮食总产量的支柱作物。随着国民经济的发展和人民生活水平的日益提高,食物结构发生了巨大变化,玉米的用途结构已由主食作物逐步转变为饲料和工业原料,发展玉米生产已成为世界农业发展的总趋势。提高玉米产量最为经济有效的途径是选用高产杂交种。根据株型不同,目前生产上推广的玉米杂交种中,分为竖叶型和平展叶型两大类,国内外玉米高产研究与实践表明,在高产条件下,竖叶型杂交种较平
Corn is the main autumn crop next to wheat in Henan Province. It has the advantages of strong heterosis, large potential for yield increase, many comprehensive utilization ways and high economic benefits. It is also the pillar crop to further increase the total grain output. With the development of the national economy and the ever-increasing standard of living of the people, the food structure has undergone tremendous changes. The use structure of maize has gradually shifted from staple food crops to feedstuffs and industrial raw materials. The development of maize production has become the general trend of world agricultural development. The most cost-effective way to increase corn yields is to use high-yielding hybrids. According to the different plant types, the current production of popularized corn hybrids are divided into two types of vertical leaf-shaped and flat leaf-type, high-yield corn research and practice at home and abroad show that under high yield conditions, vertical leaf-type hybrids are more flat