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四、主要观赏植物的营养 与施肥(续) (七)菊花 1、施肥方案:早在本世纪30年代就对菊花的营养问题进行过广泛的研究,1952年,由Post加以总结。种植前,若土壤PH值为6.0, 则需先施以石灰、过磷酸钙及完全肥料。待种植4～6周后,才施诸如7～3～6的肥料1公斤/10米~2;若是砂质土或有机质含量低的土壤,应在种植3周后施下。Laurie等(1968)建议过采用Spurway系统进行常规土壤测定;其适宜的营养范围是N25～50毫克/升,P5～10毫克/升,K20～40毫克/升及Ca150～200毫克/升。在植株生长15～16周的前8周,施氮肥很重要。
D. Main Ornamental Plant Nutrition and Fertilization (Cont.) (VII) Chrysanthemum 1. Fertilization Program As early as in the 1930s, the nutrition of chrysanthemum has been extensively studied. In 1952, it was summarized by Post. Before planting, if the soil PH value of 6.0, you must first apply lime, superphosphate and complete fertilizer. After 4 to 6 weeks of planting, apply only 1 kg / 10 m 2 of fertilizer such as 7 ~ 3 ~ 6; if sandy soil or soil with low organic matter content, apply it 3 weeks after planting. Laurie et al. (1968) recommended the use of a Spurway system for routine soil testing; the optimum nutrient range is N25-50 mg / L, P5-10 mg / L, K20-40 mg / L and Ca150-200 mg / L. Nitrogen fertilization is important in the first 8 weeks of plant growth from 15 to 16 weeks.