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品种、密度、化控剂三因素试验表明,密度是影响玉米产量的主要因素,化控条件下,不同类型玉米品种产量随密度的增加均呈先增后减的趋势。郑单958适宜密度75 000~82 500株/hm2,先玉335为67 500~75 000株/hm2,化控剂的使用并不能改变品种的适宜密度;化控条件下穗长、穗粗、行粒数与密度呈负相关,秃尖长与密度呈正相关;先玉335穗行数、千粒重随密度增加而减少,郑单958穗行数、千粒重随密度增加先增后减;化控条件下,随密度的增加穗位高增高、植株重心高度先增后降;先玉335株高降低,郑单958株高先增后降。化控剂可有效降低穗位高、植株重心、株高,降低穗位高进而降低植株重心高度增强抗倒能力是密植稳产关键因素。
The three factors tests of variety, density and chemical control agent showed that density was the main factor affecting the yield of maize. Under the condition of chemical control, the yield of different types of maize increased first and then decreased with the increase of density. Zhengdan958 suitable density of 75 000 ~ 82 500 plants / hm2, Xian Yu 335 of 67 500 ~ 75 000 plants / hm2, the use of chemical control agent does not change the appropriate species density; under conditions of control of the spike length, ear diameter, Line number and density were negatively correlated, bald length and density were positively correlated; Xian Yu 335 ear rows, 1000-grain weight with increasing density decreases, Zheng Dan 958 ear rows, 1000-grain weight first increased and then decreased with increasing density; chemical control conditions Under high density, the ear height increased and the height of the plant center increased first and then decreased. The height of the first Jade 335 decreased and the height of Zhengdan 958 increased first and then decreased. Chemical control agent can effectively reduce the ear height, plant center of gravity, plant height, reduce the ear height and thus reduce the center of gravity of the plant to enhance the ability to fall down is the key factor in close planting.