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通过对山东省1976～1995年中熟玉米高产杂交种主要农艺性状的分析,认为中熟高产玉米杂交种产量的提高,主要由于选育了紧凑型品种而增加了密度(公顷株数和公顷穗数)、公顷粒数和提高了籽粒千粒重:1976～1995年中熟高产玉米杂交种主要农艺性状的演变规律是,公顷产量、公顷株数、公顷穗数、公顷粒数和千粒重等性状呈上升趋势,穗长呈下降趋势,穗行数、穗粒数、株高、穗位高、大斑病、小斑病和生育期等性状则变化无规律。今后,中熟高产玉米育种应以大粒、紧凑株型为主攻目标。
Based on the analysis of the main agronomic traits of high yielding maize hybrids from 1976 to 1995 in Shandong Province, it is considered that the increase of yield of middle-maturing high yielding maize hybrids is mainly due to the increase of density (hectares and hectares per hectare) due to selection of compact varieties ) Per hectare, grain weight per hectare and grain weight per henry: The main agronomic traits of high-yielding maize hybrids from 1976 to 1995 were that the yield per hectare, the number of hectares per hectare, the number of hens per hectare, the number of hectares per hectare and the value of 1000-grain weight tended to increase, Spike length showed a downward trend, the number of ear rows, grain number per spike, plant height, ear height, big leaf spot, leaf spot and growth stage and other traits are irregular. In the future, medium and high-yielding maize breeding should be large grain, compact plant type as the main target.