... disease resistance,Prolong the shelf life.- Widely used in various grain crop, economic crop, as base fertilizer or ... cultivation without soil, especially suitable for tobacco, fruit crops.- Specification (Industrial Grade) Testing Items/ Quality Standard (First Class ... 8Particle Size : 80 -100MESH / 30-80MESH (200-500UM)- Specification (Optical Glass Grade)Testing Items / Quality Standard / Reference ...