Table 1 Rates of applied nitrogen fertilizer as urea or biochar-coated urea and biochar or biochar in biochar-coated urea in soils
Treatment | Nitrogen application rate (mg/kg) | Equal amount of nitrogen used in field (kg/ha) | Percent of biochar applied in soil (%) | Amount of urea applied in soil (g/pot) | Amount of biochar applied in soil (g/pot) | Amount of BCU applied in soil (g/pot) |
|---|---|---|---|---|---|---|
CK | – | – | – | – | – | |
U1 | 200 | 450 | – | 0.881 | – | – |
U2 | 160 | 360 | – | 0.705 | – | – |
U1 + B | 200 | 450 | 0.5 | 0.881 | 10 | – |
U2 + B | 160 | 360 | 0.5 | 0.705 | 10 | – |
BCU1 | 200 | 450 | 0.013 | – | 0.261 | 1.188 |
BCU2 | 160 | 360 | 0.010 | – | 0.209 | 0.950 |
BCU1 + B | 200 | 450 | 0.5 | – | 10 | 1.188 |