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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。
Based on the analysis of the main agronomic traits of maize hybrids from the 1970s to 1990s in Shandong Province, it is considered that the increase of maize hybrids production is mainly due to the increase of density, hectare grain number and the increase of 1000-grain weight of the seeds due to the selection of compact varieties, Is to increase the number of ear rows and grains per spike; the evolution of major agronomic traits of maize hybrids in Shandong Province from 1970s to 1990s was divided into gradual ascending (yield, hectares per hectare, hectares per hectare, hectares per hectare and 1000-grain weight) , Gradually descending type (small spot disease grade) and stable development type (with plant height, spikelet height, spike length, number of spikelets per panicle, large leaf spot and growth period and other traits).