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Abstract
It is not clear about the interactive effects of nitrogen, phosphorus, and potassium additions on carbohydrate accumulation in tree seedlings in the late-season of fall. In late September of 2009, 0 or 60 kg nitrogen ha−1 urea (46-0-0) was applied with 30 and 60 kg phosphorus ha−1 potassium hydrogen phosphate (0-41-45) to transplanted bareroot Changbai larch (Larix olgensis Henry) seedlings. One month after first fertilization, seedlings receiving nitrogen addition had higher nitrogen and phosphorus, but lower potassium, concentrations in combined stems and roots. The higher rate phosphorus and potassium treatment increased nitrogen concentration in coarse roots (diameter > 5 mm) without nitrogen addition and improved potassium reserves. Fertilization did not affect seedling growth and whole-plant carbohydrate accumulation. In conclusion, we recommend a fertilizer regime of 60 kg N ha−1 urea and 60 kg phosphorus ha−1 potassium hydrogen phosphate applied in fall to improve nutrient reserves and increase root carbohydrate accumulation in Changbai larch seedlings.
ACKNOWLEDGMENTS
We thank Changji Jiang and Fusen Liu from Jiangmifeng nursery, Forestry Division of Jilin, China, for supplying the materials and facilities for the experiment; Chunsheng Bai and Jinwen Liu for helping with sampling and seedling morphology test; Qichang Zhang, Chunnan Fan and Jinping Zheng from Bei Hua University, Jilin, China, for their help in seedling transport; Yuwei Liu, Jianfeng Dong, Tianyu Bai and Yuan Chai for their helps in chemical analysis. Finally, we thank anonymous reviewers for their constructive comments and editors for their corresponding assistance.