How much monoammonium phosphate (MAP)

Q1. You take a soil sample from your field, weigh it moist, oven-dry it, and weigh it dry. If the initial weight is 77 g and the final weight is 62 g, what is the gravimetric water content? If you know from previous soil sampling that the bulk density is 1.25 g cm-3, what is the volumetric water content? Make sure to show your work for full credit!

Q2. How much monoammonium phosphate (MAP) would you need to apply to an onion crop to get 30 lbs. N per acre if the fertilizer bag reads 11-52-0? How much phosphorus and potassium would this supply in oxide forms?


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