A Crop of Maize needs 5 kg of P₂O₅ /ton of grain. If the yield goal is 12 ton/ha and the soil has a concentration of 10 ppm of P₂O₅, how many kg of Diammonium phosphate (DAP fertilizer with 50% P) must be added in the basal fertilizer to meet the crop demand? Assume we apply all 100% DAP at one time
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