浚单系列玉米品种耐密性与抗病性研究

本研究以浚单系列玉米品种中较为畅销的浚单29、浚单3136、浚单658、浚单1618为试验材料，设置不同种植密度，对其耐密性及抗病性进行评价。结果表明：随着密度的增加，浚单系列玉米品种株高、重心高明显增高；茎腐病、穗腐病、南方锈病随密度的增加表现出加重趋势，以浚单658综合抗病性最好；随着密度的增加，产量构成因素中穗行数、行粒数、千粒重、单株籽粒干重等逐渐降低；产量以7.50万株/hm²密度处理下的浚单658为最高，达到13 243.8 kg/hm²。

Study on density tolerance and disease resistance of single series maize varieties

This experiment mainly studied the effect of density tolerance and disease resistance of single series maize varieties on maize yield. In this paper, four best-selling maize varieties, Jundan 29, Jundan 3136, Jundan 658 and Jundan 1618, were selected as materials. Plant height, center of gravity height, collapse and disease index were recorded in the field through different density experiments of the varieties. The main agronomic characters and yield were measured after harvest. The results showed that with the increase of density, the plant height and center of gravity height of maize cultivars in single series were significantly increased, the center of gravity height of maize cultivars in single 1618 increased by 12.4%, the ear length of maize cultivars in single 29 decreased by 10.2% with the increase of density, and the ear diameter decreased by 7.5% with the increase of density. Stem rot, ear rot and southern rust showed an increasing trend with the increase of density. Due to different varieties resistance, small spot, curiospora leaf spot, nodular smuddery and coarse shrinking showed no obvious changes with the increase of density. Stem rot of Dredging 29 showed obvious changes, panicle rot of dredging 1618 showed obvious changes, and Dredging 658 showed the best comprehensive resistance. Among the yield components, the number of rows per ear, the number of rows of grains, the 1000-grain weight and the dry grain weight per plant decreased with the increase of density, and the difference levels were different among different treatments. Among them, the yield of single 658 was 13243.8kg in the treatment of 7500 plants per hm2, and the highest yield and density tolerance was the strongest.