O-F-241D, FEDERAL SPECIFICATION, FERTILIZER, MIXED, COMMERCIAL (1 AUG 1975)

O-F-241D, FEDERAL SPECIFICATION, FERTILIZER, MIXED, COMMERCIAL (1 AUG 1975)., This specification covers a commercial fertilizer mixture containing either two or three of the primary plant nutrients, namely, nitrogen (N), available phosphoric acid, and potash. Secondary and micro plant nutrients may also be included in the mixture. These mixtures may be applied directly to the soil in solid or liquid form.