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根外追肥,就是把无机肥料配制成一定浓度的营养液,通过向植株叶片表面喷施,来解决花卉生长期间所急需的营养。常用的无机肥料有以下几种。尿素.含氮量高,易溶于水,属中性,易被植物吸收,效果显著。使用浓度多为0.5—1％,苗期不超过0.1—0.5％。过磷酸钙.主要含磷和钙,属酸性肥料,喷施前可用水将其溶解,待沉淀后取其浸出液按所需浓度配比使用。一般常用浓度1—5％,苗期0.5—1％,木本花卉用2—5％。
Root top dressing, that is, the inorganic fertilizer formulated into a certain concentration of nutrient solution, by spraying to the plant leaf surface, to solve the flower growth during the much-needed nutrition. Common inorganic fertilizers are the following. Urea high nitrogen content, soluble in water, is a neutral, easily absorbed by plants, the effect is significant. Mostly used concentrations of 0.5-1%, seedling no more than 0.1-0.5%. Superphosphate. The main phosphorus and calcium, is an acidic fertilizer, water can be sprayed before its dissolution, to be taken after the precipitation of leaching solution according to the desired concentration ratio. Commonly used concentration of 1-5%, 0.5-1% seedling, woody flowers with 2-5%.