水稻病害日见严重,其因甚多,但施肥不当是关键因素:由于滥用氮肥,磷钾没有跟上,造成稻苗徒长,稻秆柔软,田间郁蔽,纹枯病发生加重;大量施氮而未配钾肥,稻瘟病也相继出现,面积逐年扩大, Rice diseases have become more and more serious due to many reasons, but improper fertilization is the key factor. Phosphorus and potassium are not kept up due to the abuse of nitrogenous fertilizer, resulting in the growth of paddy rice, tender rice stalks, Without potassium, rice blast also appeared one after another, the area expanded year by year,