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水稻白叶枯病是我省稻作的主要病害,历年为害严重.在大流行的年份里,可以明显地看到浅水灌溉的稻田,水稻发病轻,深水灌溉的发病重.过去研究认为,秧苗期淹水过深能加重白叶枯病的发生与发展,因为水层过深易引起稻根腐烂,增加了病菌侵染的机会.然而白叶枯病的发生,主要在水稻孕穗至抽穗期,所以本田期灌水深浅与白叶枯病发病轻重的关系非常密切.水层究竟以多深为宜,是当前生产上迫切需要明确的问题.为此,1978年我们进行了预备试验,本文报道的是1979年和1980年的试验结果. 一、试验材料和方法1979年供试水稻品种,早稻为二九青、广陆矮4号,中稻为南京11号、汕优6号,晚稻为当选晚2号、105、后选2号.灌水深
Rice bacterial blight is the main disease of rice in our province and has been seriously devastated over the past years. In the years of pandemic, it is obvious that the shallow paddy fields are irrigated and the incidence of light and deep-water rice is heavier. In the past research, Excessive flooding can aggravate the occurrence and development of bacterial blight, because the water layer is too deep and can cause rice root decay, which increases the chances of pathogen infection.But the occurrence of bacterial blight mainly in the booting stage of rice to heading stage , So Honda irrigation depth and the incidence of bacterial blight is closely related to the severity of the water layer is appropriate, is the urgent need for the current production of a clear problem.To this end, we conducted a preliminary test in 1978, this article reports Are the test results of 1979 and 1980. I. Materials and Methods of Test Materials The varieties of rice for test in 1979 were early spring rice of 299 varieties and Guanglu Dwarf No. 4 of middle rice varieties Nanjing 11 and Shanyou 6, Late on the 2nd, 105, after the election No. 2. Deep irrigation