The Study Of Resistance To Tightness On Different Types Of Materials Maize Inbred Lines And Hybrids

This study under the condition of high density of maize inbred lines and hybridsof resistance to the identification of tightness, the experiment is divided into twoaspects. First one,5Inbred lines from domestic four groups for material, use Split plotexperiment method, under4.5w/hm2、6w/hm2、7.5w/hm2、9w/hm2和12w/hm2densities to plant, analysis the density-tolerance of different inbred lines, and studythe correlation between various characters and yield under different densities. Secondone,7hybrids from different heterosis patterns for material, use Split plot experimentmethod, under the same densities to plant, in order to discuss the optimal plantingdensity for the hybrid.Analysis the density-tolerance of different inbred lines, there are discrepancy ofperformance in different density on different materials through to study the averagevalue of various characters on different inbred lines. The inbred line Zheng58havethe coming best performance, ear length (12.84cm),ear thick (3.51cm), plant height(160.1cm). The inbred line PHB1M have the coming best performance, ear weight(125.23g), ear thick (4.54cm), stem diameter (1.86cm). The inbred lines Ji853havethe coming best performance, ear length (12.13cm), ear thick (4.8cm), weight per100grain (32.9g), empty plant percentage (0%). The inbred line Dan360have the comingbest performance, weight per100grain (19.16g), ear thick (2.01cm). The inbred linePH6WC have the coming best performance, ear length (12.57cm), ear thick (3.95cm).The inbred line Mo17have the coming best performance, ear thick (4.69cm), weightper100grain (19.62g). From the correlation analysis with various characters ondifferent inbred lines knows, most materials emerge positive correlation between earweight, ear length, ear thick, weight per100grain, stem diameter with yield perplant, barren ear tip，emerge negative correlation between empty plant percentage，lodging percentage with yield per plant. Taken together, the inbred line Zheng58andJi853are the better tightness resistant materials because most characters in twoinbred line have better performance.Analysis the density-tolerance of different hybrids from different heteroticpattern knows, weight per100grain and empty plant percentage of hybrid Jinongyu986from heterotic pattern improved Reid×Tangsipingtou are performance better density-tolerance. Ear weight, ear length, barren ear tip, ear position，emptyplant percentage and yield per plant of hybrid Ji nongyu711from heterotic patternReid×Lvdahonggu are performance better density-tolerance. Barren ear tip, ear thickof hybrid Ji yu106from heterotic pattern Lancaster×Tangsipingtou are performancebetter density-tolerance. Ear weight, ear length, barren ear tip, weight per100grain,stem diameter and yield per plant of hybrid Ji nongyu885from heterotic patternLancaster×Tangsipingtou are performance better density-tolerance. Ear length, earthick, plant height, ear position, stem diameter and lodging percentage of hybrid Jinongyu17from heterotic pattern Reid×Lancaster are performance betterdensity-tolerance. Taken together, in7hybrids, Ji nongyu711is the best tightnessresistant varieties which the density-tolerance is better than others and the yield perplant is the highest. Followed by Ji nongyu885and Ji nongyu17, hybrid Ji nongyu323and Ji nongyu822are not Suitable for high density to plant which is from heteroticpattern Reid×foreign miscellaneous choose and foreign miscellaneous choose×Lvdahonggu.