2 Results and Analysis 2. The relationship between yield and density and nitrogen fertilizer Table 2 Quadratic Regression Orthogonal Rotational Combination Design Variance Analysis Table variation return Degree of freedom expect F value Significant F0.05 F0.01 source sum of square Mean square X1 703.75 1 703.75 0.25 <1 4.96 10.04 X2 20880.03 1 20880.03 7.51* X1X2 14890.10 1 14890.10 5.35* X11 16078.73 1 16078.73 5.78* X22 168446.59 1 168446.59 60.58** return 220999.20 5 44199.84 15.90** 3.33 5.64 Remaining 27806.86 10 2780.69 Misunderstood 8296.82 3 2765.61 0.99 4.35 8.45 error 19510.04 7 2787.15 Total variation 248806.06 15 As can be seen from Table 2, F1=0.99 Through calculation, the regression equation is obtained: Y=1537.03+9.38X1-51.09X2-61.0lXlX2-44.83Xl2.-145.11X22 Regression coefficients for insignificant levels are eliminated from the equation to obtain the optimal regression equation: Y=1537.03-51.09X2-61.01X1X2-44.83X12-145.11X22 By fixing another factor to a zero level, a regression equation for the factor and yield is obtained. The main effect regression equation of density: Y1=l537.03+9.38X1-44.83Xl2 The main effect regression equation of nitrogen fertilizer: Y2=1537.03-51.09X2-145.11X22 Table 3 Main Effect Analysis Table project -γ -1 0 1 Gamma X1 1434.11 1482.82 1537.03 1501.58 1460.63 X2 1319.07 1443.01 1537.03 1340.84 1174.57 From the above two main effects regression equations and Table 3, it can be seen that as the density increases, the seed production further increases, but the seed production decreases when the density approaches 1; the nitrogen fertilizer application has the effect of increasing production, with the use of nitrogen fertilizer. As a result of the increase, the seed production further increased, but when the density exceeded 0, the yield of seed production decreased, so the excess output of nitrogen decreased. Table 4 Synthetic Analysis Table of X1 and X2 X2 X1 coding Y average S CV(%) -γ -1 0 1 Gamma Code-γ 1094.13 1178.58 1319.07 1369.90 1364.70 1265.28 123.02 9.72 -1 1253.80 1327.79 1443.01 1468.57 1452.90 1389.22 94.02 6.77 0 1434.11 1482.82 1537.03 1501.58 1460.63 1483.23 39.23 2.64 1 1324.19 1347.64 1340.84 1244.37 1178.16 1287.04 73.52 5.71 Gamma 1193.67 1206.65 1174.57 1052.84 976.15 1120.78 101.38 9.05 Y average 1259.98 1038.69 1362.91 1327.45 1286.51 S 128.83 122.01 136.58 183.27 207.47 CV(%) 10.22 9.32 10.02 13.81 16.13 Filtering Washing Drying Equipment Nutsche Filtration,Pressure Nutsche Filter,Vacuum Nutsche Filter,Filtering Washing Drying Equipment WUXI ZHANGHUA PHARMACEUTICAL EQUIPMENT CO., LTD. , https://www.filterdryer1976.com