一、氮元素(N)1.氮素加重受害①细菌等病害圆葱贮藏腐烂病因氮、磷、钾三要素不协调,氮元素加重受害。②真菌病害水稻稻瘟病多施氮肥,引起作物体内硅、木质素含量下降,导致受害加重。一般作物锈病锈病菌为专性寄生菌,作物有随着氮肥施用量的增加受害加重的趋势。一般作物白粉病缺乏氮素会使病原菌生长不良。③害虫水稻飞虱喜欢嫩叶,喜欢可溶性氮素。南瓜的瓜类害虫缺乏 First, the nitrogen (N) 1. Nitrogen aggravate the victims ① bacteria and other diseases onion storage decay causes nitrogen, phosphorus and potassium three elements are not coordinated, nitrogen element aggravate victimization. ② fungal diseases Rice Blast more nitrogen fertilizer, causing crop silicon, lignin decreased, leading to increased victimization. The general crop rust rust bacteria is an obligate parasitic bacteria, crop with the increase of the amount of nitrogen fertilizer victims aggravate the trend. General crop powdery mildew causes the poor growth of pathogen bacteria. ③ pests Rice planthoppers like young leaves, like soluble nitrogen. Pumpkin melons lack of pests