山东省不同年代玉米杂交种主要农艺性状演变规律的研究

通过对山东省70年代至90年代玉米杂交种主要农艺性状的分析，认为玉米杂交种产量的提高，主要是由于选育了紧凑型品种而增加了密度、公顷粒数和提高了子粒千粒重，其次是增加穗行数和穗粒数；山东省70年代至90年代玉米杂交种主要农艺性状的演变规律分为逐渐上升型(有产量、公顷株数、公顷穗数、公顷粒数和千粒重等性状)、逐渐下降型(小斑病病级)和平稳发展型(有株高、穗粒高、穗长、穗粒数、穗行数、大斑病和生育期等性状)三种类型。

Studies on Development Law for Main Agronomic Characters of Maize Hybrid in Different Areas in Shandong Province

By analysising main agronomic characters of maize hybrid in Shandong province among70'-90'S,we found that the main reason of impvoving yield in maize breeding,practice process was inreasing in density,grain number per ha and 1000-seed-weight by selecting tight plant type varieties.inreasing in row number per ear and.grain number per ear is a less-important reason for yield in maize hybrid.The development law was those characters such as yield per ha,plant number per ha,ear number per ha,grain number per ha and 1000-seed-weight tend to rise,the characters such as the degree of Southern blight of corn tends to decreased,and there were no regularity in plant height;ear positionear length;grain number perear;row number per ear;Northern blight of corn and growth stage.