1932 Print Nitrogen Green Manure Alfalfa Montana Grain Farming Field Soil FZ1 SAI This is an original 1968

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1932 Print Nitrogen Green Manure Alfalfa Montana Grain Farming Field Soil FZ1 SAI This is an original 1968This is an original 1932 halftone print of an alfalfa field in Montana. The caption writes, "The nitrogen industry can never wholly displace green manure which farmers grow on their own soil. Two crops are being harvested on this alfalfa field in Montana, a crop of forage and a crop of fertilizer. For the alfalfa plants, still growing after mowing, will be plowed under and (since alfalfa, like other members of the clover family, is a nitrogen