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一、试验地点、材料和方法 试验在安徽省肥东县鸡笼山苗圃。选择密度为每亩3—4万株的火炬松1年生播种苗作为供试苗木。 氮肥用有效成分46％的尿素,磷肥用有效成分15％的过磷酸钙,钾肥用有效成分45％的氯化钾,用氮量为每亩7.5公斤,氮、磷、钾比例为3:1:1。 小区面积5平方米,重复5次,按随机排列,小区间用保护行隔开。 处理组合及施肥时间,在常规施用基肥的基础上,以后期不追肥作对照,第一次施肥:Ⅰ_N、Ⅰ_(PK′)、Ⅰ_(NPK′)、Ⅰ_(PK)、Ⅰ_(NPK),施肥时间为9月上旬(9月3日),其中Ⅰ_(PK)、Ⅰ_(NPK′)处理的P、K于8月上旬提前施用,第二次施肥:Ⅱ_(N)、Ⅱ_(PK′)、Ⅱ_(NPK′)、Ⅱ_(PK)、
First, the test sites, materials and methods Test Feilong County in Anhui Province Cangshan nursery. Select the density of 3-4 million per acre Pinus taeda seedlings planted as a test seedlings. 46% urea for active ingredients, 15% superphosphate for active ingredients, 45% potassium chloride for active ingredients, 7.5 kg / mu for nitrogen, 3: 1 ratio for nitrogen, phosphorus and potassium :1. Residential area of 5 square meters, repeated 5 times, according to random arrangement, between the protection of small lines separated. On the basis of conventional application of basal fertilizer and no fertilizing for later period, the first fertilization: Ⅰ_N, Ⅰ_ (PK), Ⅰ_ (NPK), Ⅰ_ (PK), Ⅰ_ (NPK) The fertilization time was in early September (September 3). P and K treated with Ⅰ-PK and Ⅰ-NPK were applied early in August. The second fertilization: Ⅱ_ (N), Ⅱ_ (PK ’ ), Ⅱ_ (NPK), Ⅱ_ (PK),