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[1]WANG Yiming,WAN Fuxu,HU Fei,et al.Effects of Exponential Fertilization on the Photosynthetic Physiology Characteristics of Carya illinoinensis Seedlings[J].Research of Soil and Water Conservation,2018,25(05):187-191,198.

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Effects of Exponential Fertilization on the Photosynthetic Physiology Characteristics of Carya illinoinensis Seedlings

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 05 Page number: 187-191,198 Column: Public date: 2018-09-06

Title:: Effects of Exponential Fertilization on the Photosynthetic Physiology Characteristics of Carya illinoinensis Seedlings

Author(s):: WANG Yiming^1,2, WAN Fuxu¹, HU Fei¹, ZHANG Hui², JU Changhua², LI Ruirui¹; 1. Co-Innovation Centre for Sustainable Forestry in Southern China, College of Forest, Nanjing Forestry University, Nanjing 210037, China;
2. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China

Keywords:: pecan; exponential fertilization; photosynthetic characteristics; chlorophyll fluorescence

CLC:: S792.99

DOI:: -

Abstract:: An exponential fertilization experiment was conducted with six dose levels (applying a total of 0,100,200,400,600,800 mg/seedling in this experiment) of nitrogen to assess the effects on different nitrogen levels on the photosynthetic characteristics of pecan seedlings. The objective of this study was to reveal the nitrogen demand and determine the optimal nitrogen amount for pecan seedlings. The results indicated that:(1) the height, ground diameter and biomass of pecan seedlings increased as the nitrogen fertilization increased from 0 to 600 mg/seedling and then decreased with the nitrogen fertilization increased from 600 to 800 mg/seedling; the maximum values were 33.4 cm, 5.08 mm and 9.33 g/seedling, respectively; the root shoot ratio decreased with the nitrogen fertilizer increased; (2) chlorophyll a,chlorophyll b and total chlorophyll increased with the nitrogen fertilizer increased; (3) the net photosynthetic rate, stomatal conductance,intercellular CO₂ concentration and transpiration rate of pecan seedlings increased as the nitrogen fertilizer increased from 0 to 600 mg/seedling and then decreased with the nitrogen fertilizer increased from 600 to 800 mg/seedling.The maximum values were 10.53 μmol/(m²·s), 0.192 mol/(m²·s) 241.7 μmol/mol and 2.85 mmol/(m²·s), respectively; (4) Fv/Fm, Yield, Qp, ETR increased until the nitrogen application rate of 600 mg/seedling, with the highest values of 0.795, 0.356, 0.379 and 23, respectively. Based on these data, it could be concluded that 600 mg/seedling would be the optimal nitrogen amount for Carya illinoinensis seedlings in greenhouse.

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