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笔者在1987~1992年对水稻苗期黄、青立枯病致病因素与治疗方法的试验材料进行分析,明确了黄、青立枯病的爆发于连续低温阴雨天寒潮后回暖1~4天,死苗最严重。发病时测床土pH值7.21~7.68,电导率0.85×103~1.35×103μs/cm,Eh值-30~150mv.治疗后稻苗出现白根时pH值6.1~6.81,电导率为0.25×103~0.35×103μs/cm。Eh值250~300mv。剖析了黄、青立枯病发病时温度为主导,床土的pH值、电导率、通透性为关键,苗期管理为基础的各致病因素相对重要性和相互关系。确定黄、青立枯病是生理因素所致,并在此基础上提出预测预报方法、时期和治疗黄、青立枯病的理论依据为“盐随水走”,治疗措施“小通风,浇透水”的方法和最佳治疗时期。
In 1987 ~ 1992, the author analyzed the experimental materials of the pathogenic factors and treatment methods of yellow and white blight of rice at seedling stage, and made clear that the outbreak of yellow and green blight occurred after 1 ~ 4 days of cold in cold and rainy days Dead seedlings the most serious. The incidence of bed soil pH 7.21 ~ 7.68, conductivity 0.85 × 103 ~ 1.35 × 103μs / cm, Eh value -30 ~ 150mv. After treatment, the pH value of white roots was 6.1-6.81 and the conductivity was 0.25 × 103-0.35 × 103μs / cm. Eh value 250 ~ 300mv. The relative importance and interrelations of each pathogenicity factor based on temperature-dominated incidence of yellow and green leaf blight, soil bed pH, conductivity and permeability as the key and seedling management were analyzed. On the basis of this, we put forward the forecasting method, the period and the theoretical basis for the treatment of yellow and green blight as “the salt goes with the water” and the treatment measures of “small ventilation and pouring Permeable ”approach and the best treatment period.