早稻纹枯病越冬菌核量的定量测定及与田间早期病情的关系

Quantitative Relationship beween Sclerotia of Rhizoctonia SolaniAG-I and Incidence of Sheath Blight in Paddy

本文研究了早稻移栽前后田间水面菌核漂浮量、稻株菌核附着量与土壤越冬菌核量的定量关系，进而研究了稻株上菌核附着量与田间早期病情关系，分别组建数学模型。结果表明：各数学模型均在０．０１水平上显著，且拟合较好。越冬菌核量（ｓ）与栽秧后２天的水面菌核漂浮量（Ａｓ）关系最密切，与栽后１４天稻抹上菌核附着量（Ｒｓ）关系密切。其回归模型分别为：Ｓ＝１４６．７４Ａｓ—５．２１６３，Ｓ＝２９．７１Ｒｓ—５１．９８７。栽后１４天稻株菌核附着率（Ｒｓ）与分蘖末期田间病丛率（ＤＨ）的回归方程为ＤＨ＝１２．７６＋２．８８Ｒｓ。文章最后对回归模型的应用及存在问题进行了讨论。

The quantitative relationship of overwintering sxlerotia to floating sclerotia pre-planting and pst-planting, and adhering sclerotia on rice and hay were studied,and relation of adhering sclerotia to incidence Of sheath blight in paddy was also studied. The regression models were bulb respectively. Based on the results of F-test, the regressive equations are all statistically significant at the level of Ool,with good simulation result.