Remobilization of Storage Nitrogen in Young Pear Trees Grafted onto Vigorous Rootstocks (Pyrus betulifolia)
Abstract
1. Introduction
2. Materials and Methods
2.1. Experimental Site and Materials
2.2. Experimental Design
2.3. Measurements
2.4. Calculations and Data Analysis
2.5. Statistical Analysis
3. Results
3.1. The N Content and Concentration in Each Structure of Young Pear Trees
3.2. Stored N Remobilized in Spring and Withdrawn from Senescent Leaves in Autumn
4. Discussion
4.1. N Absorbed from Soil and Fertilizer
4.2. Remobilization of the Stored N during Spring
4.3. Storage N Derived from Perennial Structures in Spring
4.4. Redistribution of the Stored N Withdrawn from Senescent Leaves
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Group | 2016 | 2017 | 2018 |
---|---|---|---|
A | 10 g/tree ○ + 5 g/tree ● | - | - |
B | 10 g/tree ○ + 5 g/tree ● | 20 g/tree ○ | - |
C | 15 g/tree ○ | 15 g/tree ○ + 5 g/tree ● | - |
D | 10 g/tree ○ + 5 g/tree ● | 15 g/tree ○ + 5 g/tree ● | - |
E | 10 g/tree ○ + 5 g/tree ● | 15 g/tree ○ + 5 g/tree ● | 30 g/tree ○ |
F | 15 g/tree ○ | 20 g/tree ○ | 25 g/tree ○ + 5 g/tree ● |
Group | 2016 | 2017 | 2018 | |
---|---|---|---|---|
Nov. | Jun. | Nov. | Jun. | |
A | 6 trees | - | ||
B | 6 trees | 6 trees | ||
C | 6 trees | 6 trees | ||
D | 6 trees | 6 trees | ||
E | - | 6 trees | ||
F | - | 6 trees |
Years | Organs | N Content (mg) | Dry Mass Weight (g) | N Concentration (%) |
---|---|---|---|---|
Mar. 2016 Nursery | Trunk | 278.7 ± 14.8 c E | 43.2 ± 1.4 b D | 0.64 ± 0.02 b C |
Roots | 485.0 ± 15.8 b D | 42.3 ± 1.1 b D | 1.14 ± 0.06 a B | |
Total | 763.7 ± 11.7 a E | 85.6 ± 2.3 a E | ||
Nov. 2016 | Leaves | 89.6 ± 10.4 d D | 6.9 ± 0.8 d D | 1.30 ± 0.01 a D |
Shoots | 168.4 ± 20.0 d D | 13.2 ± 1.3 c E | 1.27 ± 0.04 a A | |
Trunk | 668.8 ± 39.0 c D | 65.8 ± 4.6 b D | 1.01 ± 0.03 c A | |
Roots | 789.6 ± 45.6 b C | 64.6 ± 3.8 b CD | 1.22 ± 0.03 b A | |
Total | 1716.4 ± 86.2 a D | 150.5 ± 8.2 a D | ||
Jun. 2017 | Leaves | 2286.3 ± 178.2 b B | 86.8 ± 6.7 c B | 2.64 ± 0.01 a B |
Shoots | 345.3 ± 27.2 d C | 38.1 ± 3.2 d D | 0.91 ± 0.08 c D | |
2 years old branches | 129.3 ± 4.6 d D | 16.3 ± 0.5 d E | 0.79 ± 0.01 d E | |
Trunk | 1035.3 ± 80.9 c C | 168.7 ± 12.7 b C | 0.61 ± 0.01 e C | |
Root | 1042.5 ± 67.0 c C | 84.6 ± 5.0 c C | 1.23 ± 0.01 b A | |
Total | 4838.7 ± 332.6 a C | 394.5 ± 26.2 a C | ||
Nov. 2017 | Leaves | 738.3 ± 66.4 e C | 50.6 ± 5.2 e C | 1.46 ± 0.02 a C |
Shoots | 1554.6 ± 149.6 d A | 140.8 ± 15.8 d B | 1.11 ± 0.03 c B | |
2 years old branches | 180.2 ± 13.6 f D | 17.7 ± 1.6 e E | 1.02 ± 0.05 d C | |
Trunk | 3832.6 ± 203.1 b B | 455.6 ± 34.0 b B | 0.84 ± 0.02 e B | |
Roots | 3211.6 ± 174.3 c B | 253.2 ± 20.6 c B | 1.27 ± 0.07 b A | |
Total | 9517.3 ± 584.4 a B | 917.9 ± 74.5 a B | ||
Jun. 2018 | Leaves | 8099.7 ± 541.4 b A | 295.0 ± 24.7 d A | 2.75 ± 0.07 a A |
Shoots | 1150.5 ± 124.5 ef B | 117.7 ± 12.3 f C | 0.98 ± 0.02 d C | |
2 years old branches | 1456.3 ± 108.5 e A | 208.7 ± 16.3 e A | 0.70 ± 0.01 f F | |
3 years old branches | 248.9 ± 22.9 g CD | 23.0 ± 2.1 g D E | 1.08 ± 0.01 c B | |
Trunk | 3263.5 ± 194.1 d A | 632.1 ± 32.0 b A | 0.52 ± 0.02 g D | |
Roots | 4914.6 ± 311.8 c A | 406.7 ± 27.7 c A | 1.21 ± 0.01 b AB | |
Fruits | 465.5 ± 41.9 fg | 51.1 ± 4.8 fg | 0.91 ± 0.01 e | |
Total | 19599.0 ± 1177.7 a A | 1734.3 ± 108.9 a A |
Time | Increment of Total N (mg) | Increment of N Uptake from Fertilizer (mg) | Increment of N Uptake from Soil (mg) |
---|---|---|---|
Mar. 2016 to Nov.2016 | 953 ± 93 d | 285 ± 11 c | 668 ± 88 d |
Nov.2016 to Jun. 2017 | 3122 ± 333 c | 743 ± 57 b | 2379 ± 287 c |
Jun. 2017 to Nov. 2017 | 4679 ± 584 b | 855 ± 39 b | 3823 ± 550 b |
Nov. 2017 to Jun. 2018 | 10082 ± 1178 a | 2128 ± 160 a | 7954 ± 1030 a |
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Wu, Y.; Sun, M.; Qi, Y.; Liu, S. Remobilization of Storage Nitrogen in Young Pear Trees Grafted onto Vigorous Rootstocks (Pyrus betulifolia). Horticulturae 2021, 7, 148. https://doi.org/10.3390/horticulturae7060148
Wu Y, Sun M, Qi Y, Liu S. Remobilization of Storage Nitrogen in Young Pear Trees Grafted onto Vigorous Rootstocks (Pyrus betulifolia). Horticulturae. 2021; 7(6):148. https://doi.org/10.3390/horticulturae7060148
Chicago/Turabian StyleWu, Yang, Mingde Sun, Yuanyong Qi, and Songzhong Liu. 2021. "Remobilization of Storage Nitrogen in Young Pear Trees Grafted onto Vigorous Rootstocks (Pyrus betulifolia)" Horticulturae 7, no. 6: 148. https://doi.org/10.3390/horticulturae7060148
APA StyleWu, Y., Sun, M., Qi, Y., & Liu, S. (2021). Remobilization of Storage Nitrogen in Young Pear Trees Grafted onto Vigorous Rootstocks (Pyrus betulifolia). Horticulturae, 7(6), 148. https://doi.org/10.3390/horticulturae7060148