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1施肥管理大棚建设栽培蔬菜需要大量的氮和钾,磷的需求量较少,如茄子需要的氮磷钾之比为3∶1∶4,黄瓜为3∶1∶10,番茄为6∶1∶12。大棚里磷酸二铵不宜多施,且不能与草木灰等碱性肥料混合施用,以免产生氨气,造成氨害。饼肥的碳氮比小,分解快,局部容易产生高温和高浓度的氨和有机酸,容易烧根,不宜多施。
Fertilization management Greenhouse cultivation of vegetables requires a lot of nitrogen and potassium, phosphorus demand less, such as the required ratio of N, P and O of eggplant 3: 1: 4, cucumber 3: 1: 10, tomato 6: 1 : 12. Diammonium phosphate greenhouses should not be applied, and can not be mixed with alkaline fertilizer such as ash, to avoid ammonia, causing ammonia damage. C and N ratio of cake fertilizer is small, fast decomposition, local prone to high temperature and high concentrations of ammonia and organic acids, easy to burn roots, should not be applied.