Article Figures & Data
Figures
- Figure 1.
Honeylocust roots growing in the zone influenced by the nitrogen fertilizer treatment (left) were more dense than those of the control treatment (right).
- Figure 2.
Pin oak roots growing in the zone influenced by the nitrogen fertilizer treatment (left) were more dense than those of the control treatment (right).
Tables
- Table 1.
Root densities associated with granular balanced fertilizer applied in holes in the soil in Study 1. There was no significant difference in root density between treated and control samples for any sampling period or distance from hole, but after two years, the roots near the holes with fertilizer were approximately twice as dense as the controls.
Root density (mm2 surface area/cm3 soil) Days after treatment/Core center distance from treatment hole Fertilizer treated Control 7 days/10 cm 2.4 2.2 7 days/17.5 cm 1.7 1.4 21 days/10 cm 1.5 1.2 21 days/17.5 cm 1.5 1.4 49 days/10 cm 1.3 1.0 49 days/10 cm 2.1 1.6 770 days/10cm 6.7 3.5 770 days/17.5 cm 9.2 4.4 - Table 2.
When nitrogen fertilizer was applied in holes in the soil, root density of trees was increased by the nitrogen, alone or in a balanced formulation.
Root density ( mm2 surface area/cm3 soil) Nitrogen only Balanced fertilizer Control Sample depth 10a 17.5 25 10 17.5 25 10 17.5 25 Honeylocust 5 - 10 cm 123* 74 53 117* 87 68 52 50 60 20 - 25 cm 95* 58* 43 192* 59* 41 36 29 30 35 - 40 cm 113* 34* 22* 107* 36* 13 18 13 12 Pin oak 5 - 10 cm 80* 26 26 41 36 30 28 28 29 20 - 25 cm 32* 16 16 28 19 17 13 11 9 35 - 40 cm 20* 12 8 8 10 7 10 9 9
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