Research On The High-yield Cultivation Technology Of The New Sorghum SBX

This experiment based on the material of new sorghum SBX use the two factors of density and nitrogen and quadratic general regressive rotation design with two factors,and then find the suitable cultivation measure for the new sorghum SBX.The conclusions indicate:1.The best agronomic measures for SBX varieties:planting density:331.275 thousand stem/hm~2-382.5thousand stem/hm~2,nitrogen:256.725kg/hm~2-307.5 kg/hm~2. The average yield is more than 7896.78kg/hm~2.2.In the effect analysis of single factor on the yield,the impact of the density is its largest,followed by nitrogen.Density curve is a parabola opening down,and the output also increases with the density increasing,but after reaching a peak with the density increasing,the output decline.It indicates in cultivation the density is indeed capable of producing output,but need to be controlled within a certain range; otherwise the output will be lower.This test should be controlled at 1.Marginal effect indicates:at a low level,the impact of density on the production become more than N; at a high level nitrogen rate on yield is greater than the density.Interaction effects are: an increase in production as the density increased at first,then the downward trend with the increase in density;in high-density and low-density conditions,the effect of the increase in nitrogenous is not significant.3.As for agronomic traits,the impact of the density and fertilizer treatments with the new sorghum SBX:plant height seems to be a decreasing trend along planting density increasing and seems to be a rising trend along nitrogen application rate increasing,but too much fertilizers make the effect of promoting growth reduced on the contrary.In the entire reproductive period,leaf area index reduces after increasing,and increases in a certain range as the density increases.The relationship between nitrogen application rate and leaf area index is very complicated,but combined with production.It can be known:too high or too low nitrogen application rate is not conducive to the production of the new sorghum SBX.Dry matter accumulation of different treatments throughout the growing period gradually increases.In pre-procreate,dry matter accumulation was slower,and with the advancement of reproductive period,dry matter accumulation in the late jointing and heading stage increase rapidly.Density and fertilization have a great impact on them that with the density decreasing and the fertilization increasing the dry matter will increase.4.As for characters,the effect of different density and different nitrogen application rate with soluble sugar and protein:the effect of nitrogen application rate on soluble sugar and protein is greater than the impact of density,and along with the increase in nitrogen application,rate soluble sugar and protein content will increase; with the density increasing will decreases.And soluble sugar and protein also show that:when the sugar content is high,nitrogen content is high;sugar content is low, the nitrogen content is low too.5.The correlation and path analysis of yield and relevant factors indicates:leaf area index,spike,1000-grain weight,and grain number are positively correlated with yield,and the coefficients are leaf area index(0.8304)＞spike(0.8191)＞1000-grain weight(0.0585)＞grains per spike(0.0071)＞grain weight(-0.1634).At the same time according to the path coefficient,it can be seen that spike,grains per spike,grain weight and 1000-grain weight have directly positive role on yields,and the leaf area index affects indirectly yields.