【摘要】 两年研究结果表明:小麦赤霉病病指（x）与产量损失率（y₁）、千粒重降低率（y₂）和病粒率（y₃）的关系为（?）=0.4820x+0.1771(r=0.955^**Syx=2.3938);（?）=0.4677x+0.0093(r=0.976^**Syx=1.6769);（?）=0.4532x+7.793×10^-2(r=0.9873^**Syx=1.1924).小麦亦霉病产量损失系数（c₁）为0.4820％;千粒重降低系数（c₂）为0.4677％。比较c₁和c₂可知,小麦赤霉病对小麦产量的影响主要是通过降低千粒重而起作用。从综合防治效益和质量要求衡量,小麦赤霉病防治指标为:400kg产量水平,病指4.31;350kg产量水平,病指4.93;300kg产量水平,病指5.76。更多还原

【Abstract】 The results obtained during 198T- 1988 showed that the relaLiois between the disease index (x) and the rale of the yield Losses (y1), the rate of the throusand- grain - weight decreare (y2), and the rate of the diseased grain (y3) are as follows respectively.y 1 = 0.4820x+ 0.1771 (r = 0.955Sy.x = 2.3938) y2=0.4677+0.0039 (r = 0.976Sy.x = 1.6769)y3 = 0.4532x +7.793 x 10-2 (r = = 0.9873Sy.x = 1.1924)The yield losses coefficient of wheat scab (c1) and the throusand -grain -weight decrease coefficient (c2) are sepreately 0.4820% and 0.4677’% .It is kno wn that the main factor of the wheat yield losses caused by Scab is the throusand -grain - weight decrease to compare c1 with c2. The control indexes of wheat scab are as follows resqectively . The disease index with the 400kg - yield leye1 is 4. 31, with 350kg- yield level is 4.92, with 30Dkg- yield Level is 5,74.更多还原