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Model No. : | Fertilizer for agriculture |
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Brand Name : | Zhongchang |
Product description
Item | Supreme grade | First grade | Qualified grade |
Appearance | no visible mechanical impurity | no visible mechanical impurity | no visible mechanical impurity |
N content(dry basis),% ≥ | 21.0 | 20.8 | 20.5 |
Water content(H2O),% ≤ | 0.5 | 0.7 | 1.0 |
Free acid(H2SO4)content,% ≤ | 0.03 | 0.05 | 0.20 |
Fe content, % ≤ | 0.007 | - | - |
As content,% ≤ | 0.00005 | - | - |
Heavy metal(Pb)content,% ≤ | 0.005 | - | - |
Water insolubles,% ≤ | 0.01 | - | - |
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