科学施肥是提高苗木质量和合格苗产量的关键措施之一。采用不同的肥料种类和施肥方法,对华北落叶松1a生播种苗进行田间对比试验,结果表明:1)追施尿素、碳酸氢铵、硝酸铵、硫酸铵4种化肥,其中硫酸铵效果最好,苗木平均地径、苗高和产量分别比对照提高51.81%,76.19%和123.52%;2)基施有机肥对苗木生长影响显著,苗木平均地径、苗高和产量分别比对照提高24.10%,26.84%和100.00%;3)用磷酸二氢钾进行叶面喷肥对苗木生长影响显著,苗木平均地径、苗高、根长和须根长分别比对照提高17.27%,25.76%,20.42%和17.17%。
Scientific fertilization is one of the key measures to improve the quality of seedlings and yield of qualified seedlings.By using different types of fertilizers and fertilization methods in the field,comparative test about Larix principis-rupprechtii 1a seedlings shows that:(1)In top dressing of urea,ammonium bicarbonate,ammonium nitrate and ammonium sulfate in field,the ammonium sulfate has the best effect.Based on the comparative test the average diameter,seedling height and production are 51.81%,76.19% and 123.52% higher.(2)Basing organic fertilizer has an outstanding influence on the growing of seedlings.The average diameter,seedling height and production are 24.10%,26.84% and 100.00% higher.(3)Using potassium dihydrogen phosphate to foliar fertilizer also has an outstanding influence on the growing of seedlings.The average diameter,seedling height,root length and fibrous root length are 17.27%,25.76%,20.42% and 17.17% higher than those of the former field.
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