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abortion acre agriculture ammonia amount animals better Board Boston breed building cattle cause cent Collected composition condition constituents consumed contained corn cost cows crops cultivation dairy Dry Matter early England experiment fact farm farmers feed feet fertilizers field five fodder four give grass ground grow growth horns hundred important inches increase insoluble phosphoric acid interest keep land less live manure Mass Massachusetts material meal means milk Moisture at 100 nature observations pasture period plant Plat potassium oxide pounds of insoluble pounds of nitrogen practical present produce profit question raised record reverted phosphoric acid roots season seed Sept sewage shorts Society soil solids soluble station successful taken thousand tion Total phosphoric acid town trees Valuation variety weight