洋芋是茄科作物,最忌连作。生产上常因忽视这一问题,而引起青枯病、晚疫病、二十八星瓢虫、块茎蛾等病虫害加重,严重影响产量和品质;洋芋连作,由于吸收的土壤养分较专一,还会导致洋芋因缺素、特别是缺钾而生长不良,难以形成膨大的薯块。采取合理轮作,不但可减少病虫的传播危害,还能充分用地、积极养地,收到用养结合的效果。目前生产上普遍采取的洋芋与其他作物的轮作形式:如红苕——冬洋芋——春洋芋——红苕;或在同一甘蔗行间洋芋、红苕间套种植。薯 Potato is Solanaceae crops, the most avoid even crop. Production often overlooked because of this problem, and cause bacterial wilt, late blight, twenty-eight ladybug, tuber moth and other pests and diseases, seriously affecting the yield and quality; potato continuous cropland, as absorbed more nutrient-specific soil, but also Potato will lead to due to lack of nutrients, especially potassium and poor growth, it is difficult to form a large tubers. A reasonable rotation will not only reduce the spread of pests and diseases, but also make full use of land and actively raise the land. At present, the production of potato and other crops is commonly adopted as a rotation: such as red snapper - winter potato - spring potato - red snapper; or between the same sugar cane line potatoes, red clams between sets of plants. Yam