Effects of the proportional fertilization on the nutrient content and photosynthesis of young grafted pecan seedlings

doi:10.3969/j.issn.1000-2006.201811045

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (5): 169-174.doi: 10.3969/j.issn.1000-2006.201811045

Special Issue: 薄壳山核桃专题

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Effects of the proportional fertilization on the nutrient content and photosynthesis of young grafted pecan seedlings

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

Received:2018-11-26 Revised:2019-05-05 Online:2019-10-08 Published:2019-10-08
Contact: PENG Fangren E-mail:1939565644@qq.com;frpeng@njfu.edu.cn

Abstract

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 L ₉(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 (P_n), stomatal conductance (G_s), intercellular CO₂ concentration (C_i) and transpiration rate (T_r)] 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, exceptT_r; 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.

Key words: pecan(Carya illinoinensis), proportional fertilization, nutrient elements, photosynthetic parameters

CLC Number:

S718

ZHENG Xiaoqin, CHEN Wenjing, CAO Fan, FENG Gang, LI Yongrong, PENG Fangren. Effects of the proportional fertilization on the nutrient content and photosynthesis of young grafted pecan seedlings[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2019, 43(5): 169-174.

Figures/Tables 5

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处理编号 treatment No.	因子及处理水平/(g·株^-1) actor and treatment level			处理组合 treatment group
处理编号 treatment No.	N	P	K	处理组合 treatment group
T1	4	2	1	N₁P₁K₁
T2	4	3	3	N₁P₂K₂
T3	4	4	5	N₁P₃K₃
T4	6	2	5	N₂P₁K₃
T5	6	3	1	N₂P₂K₁
T6	6	4	3	N₂P₃K₂
T7	8	2	3	N₃P₁K₂
T8	8	3	5	N₃P₂K₃
T9	8	4	1	N₃P₃K₁
CK	0	0	0	N₀P₀K₀

处理 treatment	TN			TP			TK
处理 treatment	根 root	茎 shoot	叶 leaf	根 root	茎 shoot	叶 leaf	根 root	茎 shoot	叶 leaf
T1	0.18±0.01 d	0.11±0.07 ab	0.70±0.04 d	1.23±0.06 f	0.46±0.06 h	1.68±0.04 f	0.125±0.008 abc	0.097±0.011 c	0.101±0.009 cd
T2	0.07±0.03 e	0.03±0.02 de	0.84±0.14 b	2.49±0.03 a	0.61±0.01 g	2.27±0.01 c	0.101±0.017 d	0.111±0.001 ab	0.106±0.001 bcd
T3	0.30±0.02 bc	0.07±0.01 bcd	0.78±0.06 bcd	2.27±0.12 bc	0.90±0.01 e	1.84±0.02 e	0.126±0.001 abc	0.109±0.005 ab	0.111±0.004 abc
T4	0.36±0.03 a	0.14±0.02 a	0.49±0.04 e	2.29±0.01 bc	1.06±0.01 c	2.67±0.04 b	0.118±0.017 bc	0.120±0.002 a	0.119±0.010 a
T5	0.37±0.01 a	0.04±0.03 de	0.82±0.04 bc	2.44±0.06 a	1.27±0.02 a	2.26±0.00 c	0.121±0.003 abc	0.105±0.006 bc	0.112±0.003 abc
T6	0.37±0.07 a	0.10±0.03 abc	0.74±0.03 bcd	2.20±0.02 c	1.21±0.03 b	3.20±0.07 a	0.126±0.001 abc	0.112±0.003 ab	0.099±0.001 d
T7	0.34±0.03 ab	0.05±0.03 cde	0.71±0.03 cd	2.31±0.04 b	0.96±0.02 d	1.84±0.02 e	0.132±0.001 ab	0.106±0.005 bc	0.116±0.004 ab
T8	0.25±0.01 c	0.07±0.01 bcd	0.84±0.06 b	1.12±0.01 g	0.82±0.02 f	2.00±0.04 d	0.129±0.007 abc	0.115±0.011 ab	0.111±0.008 abc
T9	0.35±0.02 ab	0.02±0.02 de	0.99±0.05 a	1.95±0.01 d	1.02±0.05 c	2.23±0.02 c	0.136±0.005 a	0.110±0.005 ab	0.098±0.003 d
CK	0.01±0.01 f	0.01±0.00 e	0.17±0.04 f	1.67±0.01 e	0.96±0.01 d	1.95±0.06 d	0.113±0.006 cd	0.113±0.005 ab	0.107±0.010 bcd

处理 treatment	P_n/ (μmol· m^-2·s^-1)	G_s/ (μmol· m^-2·s^-1)	C_i/ (μmol· mol^-1)	T_r/ (μmol· m^-2·s^-1)
T1	10.63±0.15 e	208.33±4.51 d	227.00±3.00 f	2.31±0.02b c
T2	11.53±0.06 d	239.67±3.21 a	243.67±0.58 e	2.26±0.01 e
T3	11.67±0.21 d	134.67±1.53 h	208.67±3.21 g	1.51±0.03 g
T4	14.70±0.10 a	242.33±2.52 a	279.67±3.51 a	2.27±0.03 de
T5	12.47±0.21 c	232.00±3.46 b	267.33±1.15 b	2.30±0.01 cd
T6	13.50±0.10 b	214.67±4.16 c	245.00±1.00 e	2.34±0.02 b
T7	9.77±0.06 g	189.33±3.06 e	260.00±2.65 c	1.88±0.02 f
T8	10.40±0.00 f	169.67±0.58 g	250.67±0.58 d	1.45±0.02 h
T9	11.70±0.10 d	183.67±4.16 f	269.33±1.53 b	2.41±0.02 a
CK	9.60±0.17 g	72.33±3.06 i	261.67±1.53 c	0.71±0.03 i

Effects of the proportional fertilization on the nutrient content and photosynthesis of young grafted pecan seedlings

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