name | Agricultural Grade | ||||
Superior | First-rate | Qualified | |||
Color | White or light color | ||||
Total nitrogen (N) content (dry basis),% ≥ | 46.4 | 46.2 | 46.0 | ||
Biuret content,% ≤ | 0.9 | 1.0 | 1.5 | ||
Content of water (H2O),% ≤ | 0.4 | 0.5 | 1.0 | ||
Particle size (φ 0.85-2.80mm),% ≥ | 90 | 90 | 90 |