... nutrient ingredients (Zn, Cu, Fe, Mn, B, Mo and Cl) become less and less. It will cause low yield of crops. It is ... from the soil. Magnesium is important ingredient for enhancing productivity and agriculture yield. So it needs compensated in time. (2 ... ; apply in grass-making, fertilizer, porcelain, paint, match, or and fireproof materials.(6)Culture medium ingredient for animalcule industry, additives ...