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Changbai Larch (Larix olgensis Henry) is a fast - growing timber tree species in recent years in northeast China , and comprehensively promote the fast growing forest engineering , Seedlings of demand is also growing . The Seedlings of fertilization significance is to explore the land , climate , seed production potential , soil nutrient balance , ensure the unit time per unit area of ??seedlings and stable yield, high yield, seedling production and quality , to provide quality seedlings plantation for the northeast region . Nitrogen (N) is one of the key factors of seedling development , the seedlings each stage of the growing season , the supply of nitrogen is very important . Practical application in of Changbai larch fertilization technology in the seedling stage dressing urea fertilization , artificial applicator in the nursery , after the flood irrigation or sprinkler irrigation , often resulting in low nitrogen use efficiency . Changbai larch seedling stage dressing technology is meaningful only in theory , with some guidance value in the production practice . In this study, using a split plot design and orthogonal design method , the amount of N topdressing , top dressing time , dressing proportion dressing Changbai larch seedling and transplant seedlings seedling growth of various organs Nitrogen Distribution . The results show that : 1) topdressing nitrogen fertilizer on the growth of Changbai larch seedling and transplant seedlings have a significant effect on optimum nitrogen application were 120 kg ha- 1 ; 2 ) Seedlings third top-dressing best time In mid - August , the transplant seedlings best dressing time for the beginning of July . 3) Changbai larch seedlings Effects of nitrogen fertilizer three times the best ratio of 1:2:2 . 4) timely spray after the applicator nitrogen fertilizer and water for Seedlings of both top-dressing the way the difference is not significant , taking into account factors such as labor and fertilizer costs applicator under the condition of nitrogen application of 120 kg · ha-1 is the best combination .
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