Task: Nitrogen fertilization may be needed to prevent stalling when charcoal is used fresh. This could easily persuade gardeners to overcompensate with excessive fertilization. The following approach demonstrates that only a few grams of fertilizer per kg charcoal should be sufficient.
Target: 10-50 kg N ha-1 at 50 Mg C ha-1
Rationale: This is on the order of what is needed to prevent stalling when a new crop is seeded into land where grain stubble was incorporated, from a range of light to heavy stubble.
Sources of soluble N for soaking charcoal:
Product: N content (dry wt basis)
Urea: 32%
Ammonium Sulfate: 24%
MiracleGro(TM): 15%
Example calculation:
50 kg N : 50 Mg C = 1 g : kg
1/32% = 3.125 g Urea needed per kg charcoal
1/15% = 6.667 g MiracleGro(TM) needed per kg charcoal
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