国兰对肥料的要求国兰在发芽、生长、开花的整个发育阶段中,所需要的养分种类、数量及比例有所不同。施肥就是为了最大限度地满足兰株对养分的需求。国兰和其他的植物一样,也需要多种营养元素,但需要量较多的是氮、磷、钾三种,常被称为“肥料三要素”。氮肥可促进兰株根叶快速生长,缺氮则老叶容易枯黄脱落;但氮肥过量,尤其是磷、钾供应不足时,会造成叶片徒长,不开花,易倒伏,易染病虫害。含氮高的肥料,适合于兰苗生长及叶芽萌发期使用。磷肥能使兰株茎干粗壮结实,促进开花;缺磷则茎叶徒长,叶灰暗,缺乏光泽。但磷肥过多也会产生不良影响,易造成植株矮小、繁 Guolan on the fertilizer requirements Guolan germination, growth, flowering throughout the developmental stages, the types of nutrients needed, the number and proportion of different. Fertilization is to maximize the nutrient content of the plant. Guolan and other plants, also need a variety of nutrients, but the need is more of nitrogen, phosphorus and potassium, often referred to as “three elements of fertilizer ”. Nitrogen fertilizer can promote the rapid growth of roots and leaves of blue plants, while the old leaves are easy to fall off when nitrogen is deficient. However, excess nitrogen fertilizer, especially phosphorus and potassium, will cause the leaves to grow long, not flowering, easy to lodging and susceptible to pests and diseases. High nitrogen fertilizer, suitable for Lan Miao growth and leaf buds germination period. Phosphate fertilizer can make stalks stout strong blue, to promote flowering; lack of phosphorus stems and leaves are long, dark gray leaves, the lack of luster. However, too much phosphate fertilizer will also have adverse effects, easily lead to plant short, complex