１、氮肥 氮使茎、叶生长繁茂，提高光合作用效率，增加有机物质积累，使块茎蛋白质含量提高；但氮肥过多，特别是在生长后期过多，会使植株徒长，推迟块茎成熟产量降低，且降低植株抗病力，易感染马铃薯疫病和软腐病，降低块茎质量。 施用方法：一是马铃薯在苗期和结薯初期需 1, nitrogenous nitrogen causes the stems and leaves to grow lush, improve photosynthesis efficiency, increase the accumulation of organic matter, tuber protein content increased; but too much nitrogen, especially in the late growth stage will make the plant lengthened, delayed the maturity of tubers to reduce the yield , And reduce plant disease resistance, susceptible to potato blight and soft rot, reduce tuber quality. Application methods: First, the potato seedlings and tubers need early