JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (01): 33-38.doi: 10.3969/j.issn.1000-2006.2016.01.006

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Effects of topdressing nitrogen on growth and nutrient status in leaves of Phoebe chekiangensis container seedlings

LI Yingang, LIU Xinhong*, MA Junwei, SHI Congguang, YANG Shaozong   

  1. Zhejiang Academy of Forestry, Hangzhou 310023, China
  • Online:2016-02-18 Published:2016-02-18

Abstract: With the objective of discussing reasonable topdressing method for one-year-old container seedling of Phoebe chekiangensis under production condition, we used conventional and exponential topdressing regimes to study the growth and leaf nutrient status of seedlings. Variance analysis, multi-comparison were used to analyze the effects of different method and amount on the growth, yield and allocation of dry matter, root morphology, nutrient content and uptake in leaves of one-year-old container seedlings. The results showed that with seedling height 24.50, 22.80 and 22.15 cm respectively, treatment 4, 5 using exponential method and treatment 2 using conventional method were 22.01%, 13.92% and 10.31% greater than that of the control treatment(P<0.05). Moreover, the ground diameter of treatment 4(3.74 mm)was greater than that of the control treatment(3.36 mm)significantly. Contrast with control treatment, conventional and exponential topdressing treatment increased their yield of total dry matter. With the yield of treatment 4 30.85% higher than that of the control, significant difference was available between the two treatments. But significant difference was unavailable in root-shoot ratio among treatments. Conventional and exponential topdressing could promote main root length and root length, average diameter, surface area and volume of root. And significant difference was available in root morphology between treatment 4 and control. With the increasing of amount under exponential topdressing, root morphology of treatment 3, 4 and 5 showed a trend of initially increasing and then decreasing. Although significant difference was unavailable in nutrient content of leaves among treatments, the nutrient uptake of leaves of treatment 4, 5 was higher than that of control significantly as a result of significant difference in dry matter. In general, using exponential topdressing with the total amount 200 mg/seedling(treatment 4)was the topdressing method.

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