Abstract
Five fertilizer treatments were applied to a maize-millet-sorghum rotation over four years on granitic soils of the Upper Region of Ghana. Millet responded least to NPK fertilizers, and after one complete rotation unfertilized millet and sorghum yields had declined las than that of maize. No crop responded to added K which seemed adequately supplied by burnt crop residues and droppings of grazing animals, as practised locally, but maize and sorghum showed some Indication of a response to S. It is suggested that cereal fertilizer requirements under the conditions of these trials would be met by a high analysis seedbed fertilizer based on ammonium phosphate/sulphate and calcium ammonium nitrate top dressings.
