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配方施肥对薄壳山核桃苗期养分含量及光合作用的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2019年05期
Page:
169-174
Column:
专题报道
publishdate:
2019-09-20

Article Info:/Info

Title:
Effects of the proportional fertilization on the nutrient content and photosynthesis of young grafted pecan seedlings
Article ID:
1000-2006(2019)05-0169-06
Author(s):
ZHENG Xiaoqin1 CHEN Wenjing1 CAO Fan1 FENG Gang1 LI Yongrong2 PENG Fangren1*
(1.Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; 2. Green Universe Pecan Science & Technology Co., Ltd., Nanjing 210007, China)
Keywords:
pecan(Carya illinoinensis) proportional fertilization nutrient elements photosynthetic parameters
Classification number :
S718
DOI:
10.3969/j.issn.1000-2006.201811045
Document Code:
A
Abstract:
【Objective】 The effects of nitrogen(N), phosphorus(P)and potassium(K)treatments on the nutrient content and physiological characteristics of young grafted pecan seedlings were studied to determine the optimum fertilization scheme. 【Method】 Two-year-old seedlings from native Chinese ‘Shaoxing' pecan seeds were collected as rootstock and the U.S.-released pecan cultivar ‘Mahan' as scion. After one year of growth, the young grafted seedlings were transplanted into pots for use as experimental materials. Based on the L9(34)orthogonal experimental design, fertilization experiments were conducted with three factors, i.e., N, P and K, and three treatments, i.e., N: 4,6,8 g/plant; P: 2,3,4 g/plant; K: 1,3,5 g/plant. The effects of different treatments on the nutrient content(total N, total P and total K)of different tissues(roots, shoots and leaves)and the whole plant as well as the chlorophyll content and photosynthesis-related indicators [net photosynthesis rate(Pn), stomatal conductance(Gs), intercellular CO2 concentration(Ci)and transpiration rate(Tr)] of pecan leaves were tested and analyzed. 【Result】 Proportional fertilization significantly increased the total N, total P and total K contents of the whole plant and all tissues of young grafted pecan seedlings. Among the different tissues, the total N and total P contents were the highest in leaves, followed by the roots and then shoots. Further, the total K content was the highest in the roots, followed by the shoots and then leaves. Chlorophyll a and b contents peaked in mid-July. Proportional fertilization significantly affected the photosynthesis-related indicators of seedlings, except Tr; the other indicators were present as N>K>P. 【Conclusion】 Proportional fertilization of pecan seedlings significantly increased the nutrient content of the whole plant and different tissues, chlorophyll content in leaves, and photosynthetic capacity. It was preliminarily concluded that the optimum fertilization ratio for pecan seedlings was that used in the last treatment, i.e., N: 6 g/plant, P: 2 g/plant, and K: 5 g/plant.

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Last Update: 2019-10-08