Roadside Revegetation

IMPLEMENTATION GUIDES
Table 10.2 | Estimated nitrogen release rates for some commercially available fertilizers
Most release rates were obtained from lab testing. How they actually release on-site will vary from site to site, depending on temperature, moisture,
and whether the fertilizer was placed on the surface or incorporated into the soil. If slow-release fertilizers are broadcast on the soil surface, release
rates should be slower than if incorporated into the soil where the conditions are better for break down. Arid sites should have slower rates of release
than sites with high moisture; cold sites should take longer to release nutrients than warm sites. First year nitrogen release rates for fertilizers are
identified with an asterisk were adapted from Claassen and Hogan (1998). Non-asterisk fertilizers were based on best guess estimates.
Available Nutrients
Source
N %
1st year N release
(%)
% P O % K O
Ammonium nitrate 34 99 to 100 0 0
Ammonium phosphate* 10 99 to 100 34 0
Ammonium sulfate 21 99 to 100 0 0
Anhydrous ammonia 82 99 to 100 0 0
Biosol® * 7 50 to 70 2 3
Calcium nitrate 15.5 99 to 100 0 0
Diammonium phosphate 18 99 to 100 46 0
Fertil-Fibers® * 6 50 to 70 4 1
Gro-Power® * 5 95 to 99 3 1
IBDU 29 95 to 99 3 10
Osmocote 18-6-12® * 18 95 to 99 16 12
Polyon PCU 40® * 30 99 to 100 0 0
Potassium nitrate 13 99 to 100 0 45
Ringer® * 5 50 to 70 10 5
Sustane® * 5 50 to 70 2 4
Urea 46 99 to 100 0 0
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