na INLIS000000000005944 0010-1021000778 Potassium in The Agricultural Systems of the Humid Tropics Proceedings of the 19th Colloqium of the International Potash Institute Held in Bangkok International Potash Institute Bangkok International Potash Institute 1985 405p; ill;23cm 631.84 631.84 AGRICULTURAL SYSTEMS POTASSIUM TROPICS. 5244