春小麦赤霉病产量损失的研究

通过人工接种的方法,在田间造成小麦赤霉病流行强度不同的小区。作者系统研究了小麦赤霉病所致产量损失和经济损失,及病穗率与病粒率和病情指数问的关系。得到了小麦赤霉病发病程度与产量损失和经济损失的数学关系式。感病品种垦大一号的关系式为:L=I/(0.49 0.018I),抗病品种克旱九号的关系式为:L=I/(0.55 0.018I)(L——产量损失率,I——病情指数)。经济损失方程为:UEL=UY·L·P(UEL——经济损失,UY——667m~2产量,P——小麦单价)。同时得到病穗率与病粒率的经验公式为:G=0.1935E 0.97(G——病粒率,E——病穗率)。病穗率与病情指数的经验公式:克旱九号为I=E/(2.82—0.014E),垦大一号为I=E/(3.31—0.02E)。

STUDY ON THE YIELD LOSSES CAUSED BY SPRING WHEAT SCAB

The differences of spring wheat scab prevalence intensity in experimental plots were made through the artificial inoculation under field conditions,and yield losses and economic losses resulted from wheat scab,and the relation between sick ear rate,sick grain rate and pathological sate indexes were studied systematically. Thus,the mathematical formulas between degrees of wheat scab and the yield losses were established. The relation formula of susceptible variety Kenda No.1 is L=I/(0.49+0.0181),whereas the formula of the resistant variety Kehan No.9 is L=I/(0.55+0.0181) (L-yield loss rate, I-disease state index). The economic loss equation is:UEL=UY·L·P (UEL-economic loss;UY-yield per 667m²;P-unit price of wheat). At the same time we also have got the empirical formula between sick ear rate and sick grain rate, which is G=0.1935E+0.97 (G-sickgrain rate,E-sick ear rate) and empirical formulas between sick ear rates and disease state indexes which are I=E/(2.82-0.014E) for Kehan No.9,and I=E/(3.31-0.02E) for Kenda No.1.