Korea, 1963 - A new system of land terracing is spreading throughout Korea which will vastly increase food production as well as achieving maximum soil and water conservation. This improved agricultural technique was first introduced in a U.N. Special Fund project - agricultural survey and demonstration program in the Korean uplands being carried out by FAO with the cooperation of the American-Korean Foundation. Sweet potatoes, fertilized with N-F-K and log manure produced over 14 tons per acre.