论文部分内容阅读
1986—1988年利用抗感品种混植对水稻主要病害的效应进行了研究。结果表明:(1)对稻瘟病抑制作用显著,尤以对叶瘟效果最好(F=46.55,P<0.01)。与应发病值相比,其相对抑制效果:病叶率减少74.23%,病情指数降低85.30%。单植的病害日侵染速率(r)比混植高一倍以上。病情严重度与组合内抗感比例密切相关(r=0.951)且呈幂函数关系:(?)=3.3918×7.4446x。(2)对稻纹枯病和稻白叶枯病均有一定效应,但不如稻瘟病显著。文中还对混植机理及存在问题进行了探讨。
In 1986-1988, the effect of planting anti-susceptible varieties on the main diseases of rice was studied. The results showed that: (1) The inhibitory effect on rice blast was significant, especially on the leaf blast (F = 46.55, P <0.01). Compared with the incidence should be, the relative inhibitory effect: sick leaves rate decreased 74.23%, disease index decreased 85.30%. The rate of single plant disease infection (r) was more than double that of the hybrids. The severity of the disease was closely related to the proportion of intra-group resistance (r = 0.951) and showed a power function relationship (?) = 3.3918 × 7.4446x. (2) had some effect on rice sheath blight and rice leaf blight, but not as significant as rice blast. The paper also discusses the mechanism of planting and its existing problems.