Fertilizer and manure can be added to the soil in order to increase the yield of crops. Fertilizer, however, has more nutrients in it and is therefore more beneficial to growing plants. Manure can be prepared in fields (created by animal and plant wastes) while fertilizer is created in factories (using chemical compounds). Manure provides humus to the soil while fertilizer does not, but fertilizer is absorbed by plants more quickly than manure.
