The Study On Yield Formation And Physiological Characteristics Of Different Maize Varieties

High-yield varieties are one of the important factors for maize yield, dry matter production, transportation and distribution is important to production. The density of the 6 maize hybrid( (ShanDan 8806, ShanDan 602, ShanDan 604, ShanDan 605, DengHai 601, JingDan 28) was 75 000 plants/ha. After the survey of dry matter accumulation, leaf area, photosynthetic characteristic parameters, grain filling rate, different physical parameters of dry matter accumulation of maize varieties, transportation and distribution and yield formation, we got the results :1. According to the level of output, six maize varieties can be divided into three types, ShanDan8806 and JingDan 28 reached 11000kg/ ha; DengHai 601andShanDan602 reached 9870kg/ha; ShanDan 604 and ShanDan 605 reached 8870 kg/ha.2.The group dry matter accumulation of the 6 maize varieties fit "Logistic curve," and precision reached significant level.Dry matter accumulation after flowering deciside the seeds yield., Dry matter accumulation after flowering of biomass of ShanDan 8806 and JingDan 28 were 64.53%,69.77% ,while ShanDan 604 and ShanDan 605 were 58.41%,57.21%。So total dry matter accumulation determines the grain yield, especially the dry matter accumulation after flowering.3. The trend of stem, leaf ,sheath and bracts proved were all single-peak curve, the dry matter reduction and rate of different maize varieties decline significantly. The contribution to seeds from Stem and sheath was larger than leaf and bracts. The contribution to seeds after flowering of ShanDan 8806 and JingDan 28 was 46.36 % and 45.96 % respectively, while ShanDan 604 and ShanDan 605 was27.60% and 30.15% respectively. So the high contribution to seeds from dry matter after flowering is the feature of the high-yield varieties.4.Comparied with ShanDan 8806,JingDan 28 and ShanDan 604,ShanDan 605,the value of the former is larger than the latter and less decline to maturity on leaf area index,SPADof chlorophyll content,net photosynthetic rate and Pn. good photosynthetic characteristics is physiological basis of high-yielding maize varietie.5.The grain filling process of different varieties can be fit with Logistic curve y=k/(1+a*exp(-b*x)) , fitting precision reached significant level, the average rate and the largest rate of grouting of ShanDan 8806 and JingDan 28 was maximum.