【摘要】 采用尿素甲醛缩合物作氮源，混配磷钾等肥料，经挤压造粒，研制出适合苗木生长的新型专用肥。经试验以一次性施入底肥，落叶松播籽一年，其干物质重量比普通化肥增加１３５％。樟子松换床２年，株高与习惯施肥相比增加８．１８％～９．４５％，地径增加１０．５０％～１２．１１％，茎生长量增加２３．５１％。土壤中氮的残留量是空白的４倍，是习惯施肥的３倍。更多还原

【Abstract】 A new special fertilizer for nursery stock was made up of ureoformaldehyle and phosphons potassium,which through extrusion into grains if as base fertilizer. A year after sowing,the dry matter of Larix gmelinii(Rupr) kus increased 135% than general fertilizer. After changing bed stem height of pinus sylvestris var increased 8.18%～9 45%,10 50%～12 11% and 23.5% than usual fertilization. Nitrogen residuces of treatment group increased 3 times than usual fertilization.更多还原