条纹型水稻赤枯病在广东梅县已发生多年,一直被误认为是土壤反酸和缺少氮肥所致,因而采取施用石灰和大量化学氮肥,结果反使病情加重,产量下降,有时甚至失收。为查明该病发生之原因及对其发病的特征进一步观察,作者对发病土壤和稻株进行了化学分析,并取土进行了盆栽试验。研究结果表明:(1)发病土壤和植株严重缺钾。(2)凡发病的植株,其叶片(顶叶往下第3片叶)的K_2O/N值在0.42以下,可溶性氮与蛋白氮之比率在0.8％以上,而正常植株的叶片K_2O/N值则在0.5以上,可溶性氮与蛋白氮之比率在7.1％以下。施钾能提高叶片的K_2O/N值及蛋白氮含量,降低可溶性氮含量,对于防治该病及水稻的增产均具有显著的效果。(3)稻株的K_2O/N值受土壤速效钾、氮比值的支配,两者呈显著的二次曲线相关。而水稻产量则与分蘖盛期植株的K_2O/N值关系密切,植株K_2O/N值过低或过高,都不能获得最高产量。(4)本研究发现的赤枯病,与目前文献报道的几种类型水稻赤枯病在一些症状上有较大的差异。而主要区别在于这种病害的发生,首先是叶尖的中脉与侧脉先后变成黑褐色,然后在变色的叶脉两侧出现褐棕色的针尖状小斑点。最后叶脉间的叶肉组织变成淡黄(或灰白)色,而叶脉保持褐色,结果使发病叶片呈褐黄(或白)相间的条纹状。为区别于其它类型赤枯病,拟称 Striped rice red blight has occurred in Meixian, Guangdong for many years, and has been mistakenly identified as soil acid reflux and lack of nitrogen fertilizer. Therefore, the application of lime and a large amount of chemical nitrogen fertilizer resulted in the aggravation of the disease and the decline of yield and sometimes loss of yield. In order to find out the cause of the disease and to further observe the characteristics of the disease, the authors conducted chemical analysis of the soil and rice plants, and took pots for soil tests. The results show that: (1) the incidence of soil and plant potassium deficiency. (2) The K_2O / N value of the diseased plant leaves (the third leaf down from the parietal lobe) was less than 0.42, the ratio of soluble nitrogen to protein nitrogen was above 0.8%, while the K_2O / N value of normal plants Then above 0.5, the ratio of soluble nitrogen to protein nitrogen is 7.1% or less. Potassium application could increase K 2 O / N value and protein nitrogen content of leaves and decrease soluble nitrogen content, which had significant effects on controlling the disease and increasing yield of rice. (3) The K_2O / N ratio of rice plants was dominated by the ratio of available potassium and nitrogen in soil, and the correlation between them was significant. However, the yield of rice was closely related to the K2O / N ratio of plants at full tillering stage. The K2O / N ratio was too low or too high to obtain the highest yield. (4) The present study found that there is a big difference in some symptoms between the reported types of rice blight and those reported in the literature. The main difference lies in the occurrence of this disease, the first is the tip of the midrib and lateral veins have become dark brown, and then appear on both sides of the discolored brown-brown needle-like small spots. The mesophyll tissue eventually became pale yellow (or gray) in color, while the veins remained brown, resulting in brownish-yellow (or white) stripe-like leaves. To distinguish it from other types of red wilt, intended to be said