随着水稻施肥量的不断增加,有些地区因肥料配合比例不当等原因,导致水稻病害加重,尤其是纹枯病和胡麻斑病,已成为夺取水稻高产稳产的主要障碍之一。一般认为(1),纹枯病的发生和为害,受菌源数量,水、肥管理,种植密度,品种抗性和气候等多种因素的影响。缺肥(尤其是缺钾)或是氮钾比例不当,一般都会促使胡麻斑病发生或加重。 With the increasing of the amount of fertilizers in rice, the rice diseases have been aggravated by the improper proportion of fertilizers in some areas, especially the sheath blight and the flax blight, which have become one of the major obstacles to the high and stable yield of rice. It is generally considered (1) that the occurrence and damage of sheath blight are influenced by many factors such as the number of bacterial sources, water and fertilizer management, planting density, variety resistance and climate. Shortages (especially potassium deficiency) or inappropriate proportion of nitrogen and potassium, will generally promote the occurrence or aggrandizement of flax spot.