摘要
采用回归通用旋转设计方法试验,组建了以水稻纹枯病进展速率(R)为目标函数的数学模型:结果表明:对纹枯病进展速率的影响是氮量>密度>钾肥,其中以施氮量为关键因素;对病害进展速率影响的交互因素是氮量和钾肥。经模型的模拟优化和仿真,在试验幅度内,每亩施纯氮量最高,钾肥用量最小,密度最大的情况下,病害进展速率最大;在施氮量最小、钾肥量偏低、密度最小的情况下,病害进展速率最小(最优)。
By means of othe 3 factors-5 levels Universal rotational regressioncombination design, disease progress rate (DPR) of rice sheath blight wasemployed as t?get function, and its mathematical model was set up:R=0.11157+0.00986X_1-0.00155X_2-0.00210X_3-0.00539X_1X_2+0.00113X_1X_3+0.00114X_2X_3-0.00295X_1~2+0.00106X_2~2 0.00220X_3~2 (Where X_1 is N fertilizer, X_2 is K fertilizer, and X_3 is density) The resuet shows that effect of factors were X_1>X_3>X_2.X_1 was themain factor among the ε factors. X_1 combined with X_2 had a significanteffect on DPR. DPR increased with H_1 increasing. When X_1 was In a highlevel; as X_2 increased, DPR decreased; when X_1 was in a low level, as X_2increased, DPR increased. Optimization of simulation results showed thatwhen X_1 was maximum, X_2 was minimum, X_3 was the the densiest, andDPR was maximum; when X_1 was minimum, X_2 was low and X_3 was thesparsiest, DPR was minimum (optimum), in the range of experiment.
关键词
水稻
纹枯病
栽插密度
氮肥
Rice sheath blight
Mathematic model
Nitrogen fertilizer
Kali fertilizer
density
