摘要
作者应用通用旋转组合设计方法和植物病害流行学原理,定量分析了田间菌核量(X_1)、施氮量(X_2)、灌溉方式(X_3)对水稻纹枯病初侵染病株率(DP)、水稻蜡熟期病指(DI)、水平扩展速率(Rh)、垂直扩展速率(Rv)的综合效应,并分别组建了数学预报模型。因子解沂结果表明,三因素对DP、DI、Rh、Rv的作用大小分别是:X_2>X_1>X_3,X_2>X_3>X_1,X_2>X_1>X_3,X_2>X_3>X_1。其中X_2是左右纹枯病发生流行的主导因素,X_3主要影响病害垂直扩展速率及蜡熟期病情指数,X_1主要影响初侵染数量及水平扩展速率。文中从定量的高度探讨了控氮栽培、适时露田及减少初侵染源对控制病害流行的意义和作用,对各因素的作用方式及作用原理进行了科学的分析。
A general rotation regression design experiment was conducted to study the comprehensive effect of sclerotium number(X_1), nitrogen level(X_2)and irrigation pattern(X_3) on the initial infection rate(DP), disease index in dough stage of rice(DI), and horizontal and vertical expansion rate(Rh and Rv)of rice sheath blight Rizoctonia solani Kuhn. A series of mathematical prediction models were developed. The order of effects of the three factors on DP, DI, Rh and Rv were X_2>X_1>X_3, X_2>X_3>X_1, X_2>X_1>X_3 and X_2>X_3>X_1, respectively. Of them, the X_2 was the dominant factor determining the epidemic of the disease, and the X_3 mainly affected on the vertical expansion rate and the disease index in dough stage,while the X_1 mainly affected on the initial infe- ction rate and horizontal expansion rate quantitatively controlling of the reasonable nitrogen amount, the desirable dry-up time and the de- crease of initial infection source, and the mechanism of effects of the three factors in disease control were discussed.
出处
《植物保护学报》
CAS
CSCD
北大核心
1993年第2期97-103,共7页
Journal of Plant Protection
关键词
水稻
纹枯病
施氮量
灌溉
rice sheath blight
nitrogen
irrigation
sclerotium number
prediction model
