【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)。更多还原

【Abstract】 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+0.00986X₁-0.00155X₂-0.00210X₃-0.00539X₁X₂+0.00113X₁X₃+0.00114X₂X₃-0.00295X₁²+0.00106X₂² 0.00220X₃² （Where X₁ is N fertilizer, X₂ is K fertilizer, and X₃ is density） The resuet shows that effect of factors were X₁>X₃>X₂.X₁ was themain factor among the ε factors. X₁ combined with X₂ had a significanteffect on DPR. DPR increased with H₁ increasing. When X₁ was In a highlevel; as X₂ increased, DPR decreased; when X₁ was in a low level, as X₂increased, DPR increased. Optimization of simulation results showed thatwhen X₁ was maximum, X₂ was minimum, X₃ was the the densiest, andDPR was maximum; when X₁ was minimum, X₂ was low and X₃ was thesparsiest, DPR was minimum （optimum）, in the range of experiment.更多还原