Effects Of Sowing Date And Density On Corn Yield And Growth In Jining Ares

The effect of planting time to disease of Zhengdan958was researched. And same time, the relationship beteew the densities and yield and agronomic traits was studied with Zhengdan958, Xianyu335, Xundan20, Ludan981. The results studied provided reference in maize production in Jining.1. By three-year test results can be drawn in Jining that corn planted after June15to avoid the incidence of maize rough dwarf disease peak, reducing the incidence of disease and graining the more high and stable yield.2. As the density increase agronomic traits, including plant height, ear of corn and leaf area index, also increased, but stem diameter and anlge of leaf decreased.There was inconsistent changes in different species. The growth rate decreased with the density increased in dry matter accumulation of ground plant, Differences in growth rate of different density zhengdan958and Xundan20is less than Ludan981.3. The relationship between grain yield and density was increase with the density increase, and then lower. It is parabolic change. The results showed that the planting density of Zhengdan958and Xundan20in Jining is about6.75Million strains/hm2; Xianyu335is about6Million strains/hm2, Ludan981is5.2strains Million/hm2, which is the best planting density in Jining.