Stalk rot is a serious and widespread soil-borne disease in maize, which reduces both yield and quality. Moreover, recently, because the changes of cultivation practices (conservation tillage, straw returning etc) and climatic conditions, stalk rot of maize aggravated year by year in China. Using chemicals to control the disease can not control it completely, and it often cause environment pollution. It has been found that application of potassium (K) fertilizer can result in reduction of maize stalk...