Phosphate gypsum is used to replenish lime without increasing pH. By-products are produced in the process of producing a phosphate solution from phosphorus ore. The main component is 2 water gypsum (CaSO4; calcium sulfate | 2H2O) Basicity is not preferred. However, it requires a lot of CaO, Ca (OH) 2, CaCO3 (egg shell, shell, coral skeleton, etc.) and is effective. Seed potato cutting, disinfection, seed potato curing treatment, sprouting, planting direction, etc. Proper supply of N and K by obtaining excellent seeds and distribution system. Original fertilizer, top dressing, mulch, seed potato weight, strut height, planting density, planting method

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