Some nos. include Reports compiled from information furnished by State Foresters (and others).In 1965, the average supply of P205 of about 200 lb. per acre constituted nearly 50 percent of all phosphate fertilizer, ... Raising Potassium Level Proves Difficult The element potassium is important in developing vigorous tree planting ... Considering both broadcast and liquid treatments, the total addition of potassium sulfate (50 percent K20) approached 4, 000 lbs. per acre at an average cost of $120.
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