Fertilizer Nitrogen Uptake and Partitioning in Young and Mature Common Hackberry (Celtis occidentalis) Trees

L.P. Werner; L.G. Jull

doi:10.48044/jauf.2013.012

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Figure 1.
Effect of growth phase on total % [N] in the tissues of common hackberry in 2001 in Waukesha. Bars represent the standard error of the mean. Asterisks (*) next to the harvest periods (days after fertilization) indicate significant differences between growth phases. Letters above bars that differ indicate significant treatment differences (P < 0.05) within a harvest period.
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Figure 2.
Effect of N application rate on total % [N] in the tissues of common hackberry in 2001 in Waukesha. Bars represent the standard error of the mean. Asterisks (*) next to the harvest periods (days after fertilization) indicate significant differences between growth phases (P ≤ 0.05). Within a harvest period, columns with different letters are significantly different from one another (P ≤ 0.05).
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Figure 3.
Effect of growth phase on the percentage of nitrogen derived from fertilization (NDFF) in the tissues of common hackberry in 2001 in Waukesha. Bars represent the standard error of the mean. Asterisks (*) next to the harvest periods (days after fertilization) indicate significant differences between growth phases (P ≤ 0.05) within a harvest period.
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Figure 4.
Effect of N application rate on the percentage of nitrogen derived from fertilization (NDFF) in the tissues of common hackberry in 2001 in Waukesha. Bars represent the standard error of the mean. Asterisks (*) next to the harvest periods (days after fertilization) indicate significant differences between rates of N application (P ≤ 0.05).

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Table 1.

Analysis of Variance (ANOVA) of the effect of growth phase and application rate on percent % total (N) in common hackberry tissues in 2001.

Tissue	Source	Days after fertilization
Tissue	Source	Pre	14	30	60	90	120	150
Foliage	Growth phase (GP)	0.082	0.028	0.096	0.257	0.146	0.154	NA^{^z}
	Treatment (Trt)		0.277	0.073	0.046	0.052	0.363	0.869
	GP * Trt		0.040	0.451	0.508	0.133	0.384	NA
Current stem wood	Growth phase (GP)	<0.001	<0.001	0.061	0.008	0.223	0.372	<0.001
	Treatment (Trt)		0.802	0.498	0.933	0.674	0.130	0.229
	GP * Trt		0.597	0.229	0.086	0.053	0.803	0.756
Stem wood	Growth phase (GP)	0.759	0.048	0.589	0.031	0.029	<0.001	0.044
	Treatment (Trt)		0.690	0.041	0.245	0.647	0.066	0.823
	GP * Trt		0.478	0.671	0.997	0.902	0.191	0.407
Roots	Growth phase (GP)	0.587	0.253	NA^{^y}	0.143	0.037	0.039	0.068
	Treatment (Trt)		0.379	NA	0.019	0.370	0.003	0.022
	GP * Trt		0.212	NA	0.002	0.054	0.416	0.026
Fruit	Treatment		0.079	0.903	0.357	0.500	0.226	NA^{^z}

↵^zLeaves of young trees and fruit of mature trees not present at 150 days.
↵^yTissues not collected at 30 days because of stress to canopy development in young trees.

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Table 2.

Analysis of Variance (ANOVA) of the effect of growth phase and application rate on percent nitrogen derived from fertilizer (NDFF) in common hackberry tissues in 2001.

Tissue	Source	Days after fertilization
Tissue	Source	14	30	60	90	120	150
Foliage	Growth phase (GP)	0.008	0.021	<0.001	0.009	0.023	NA^{^z}
	Treatment (Trt)	0.127	0.001	<0.001	<0.001	<0.001	0.042
	GP * Trt	0.762	0.470	0.142	0.076	0.129	NA
Current season stem wood	Growth phase	0.006	0.019	0.028	0.008	0.023	0.001
	Treatment	0.007	<0.001	<0.001	<0.001	<0.001	<0.001
	GP * Trt	0.004	0.245	0.118	0.005	0.049	0.018
Stem wood	Growth phase	0.001	0.003	0.004	0.008	0.010	0.008
	Treatment	0.004	<0.001	<0.001	<0.001	<0.001	<0.001
	GP * Trt	0.806	0.039	0.176	0.048	0.174	0.102
Root	Growth phase	<0.001	NA^{^y}	0.087	0.616	0.013	0.480
	Treatment	0.121	NA	0.013	0.002	<0.001	<0.001
	GP * Trt	0.760	NA	0.480	0.761	0.351	0.081
Fruit	Treatment	0.104	0.167	0.043	0.021	0.022	NA^{^z}

↵^zLeaves of young trees and fruit of mature trees not present at 150 days.
↵^yTissues not collected at 30 days because of stress to canopy development in young trees.