2.2 Interaction Between Density and Nitrogen Fertilizer From Table 2, it can be seen that the interaction effect between density and nitrogen fertilizer F = 5.78> F0.05 = 4.96, indicating that the interaction effect between density and nitrogen fertilizer is significant, and the output is not only affected by the individual agronomic measures, but also affected by The effect of interaction. From its synergy analysis (Table 4), the density (x1) has the greatest effect on the yield with γ level (CV is 16.13%). At the low density level, the change of nitrogen application has little effect on the yield (CV is 9.32%～10.20%). The change in N application rate at high density has a greater impact on yield (CV 13.81% to 16.13%); N(X2)-Y-level has the greatest impact on yield (CV is 9.72%). At medium N fertilizer levels, density The impact of the changes on yield was not significant (CV was 2.64%). When the levels of low-nitrogen and high-nitrogen fertilizers were changed, the change in density had a greater impact on the yield (CV was 5.71% to 9.72%). From the table alone, it can be known that the highest yield is achieved near the zero level of x1, x2. 2.3 When the model is optimized for the highest yield, the factors should be taken as the level value, the density is 0.1, and the nitrogen fertilizer is -0.18, ie, the density is 298785 plants/hm2 and the pure nitrogen is 196.35kg/hm2. Taking the yield of l425kg/hm2 as an index, that is, Y≥1425, the regression equation is obtained through computer optimization: Y=l537.03+9.38X1-51.09X2-61.01XlX2-44.83X12-145.11X22 Calculate the statistics of each level by calculation, as shown in Table 5. Table 5 Statistics of each level project X1 X2 Coded average 0.09 -0.18 Standard error 0.08 0.05 T0.05×SE 0.15 0.09 95% confidence interval minimum -0.05 -0.27 95% confidence interval limit 0.24 -0.09 The 95% confidence interval coding value in Table 5 was used to calculate the optimum density of rapeseed seed production above 1425 kg/hm2 and the fertilization plan was density 277440-318435/hm2 and pure nitrogen application 181.5 to 210.00 kg/hm2. 2.4 Analysis of Yield Components From the test data, the weight of a thousand grains ranged from 3.45 to 3.65 g with little difference. The number of pods per pod was between 8.9 and 14.4, and the effective fruitage per plant was between 299.8 and 835.9. For rapeseed production, if we want to further increase the yield, there is little potential for increasing the grain weight, and the potential for increasing the number of effective pods and pods per pod is greater. Therefore, it is mainly necessary to increase the effective number of pods and grains per pod. Increase production. 3 Conclusions and Discussion The optimum density of rapeseed production for two-line nuclear sterile cotton ll oil ll higher than 1425 kg/hm2 and nitrogen fertilizer application program were density 277440-318435 strains/hm2 and pure nitrogen application 181.50-210.00 kg/hm2. The program can be used as a reference program for other combinations of cotton oil series and can be adjusted according to the characteristics of different combinations. The two important factors affecting the seed production of the two-line nuclear-sterilized Mianyou 11 rapeseeds were significantly different in density and nitrogen fertilizer interaction. When the level value density is 0.1, nitrogen fertilizer is -0.18, that is 298785 strains/hm2, and pure nitrogen is 196.35kg/hm2, and the yield reaches the highest value. Titanium Auto Parts,Titanium Wheel Nut,High Strength Lug Nu,Titanium Alloy Wheel Bolts Baoji Qiyuexin Metal Material Co., Ltd. , https://www.qyxtitanium.com