BIOLOGICAL FACTORS Those factors, suci as plant and animal characteristics and pest problems, t-at influence the health and vitality of plants and animals and the quality of harvested products. BIOLOGICAL FEASIBILITY An action :r project is said to have this attribute if it is biological:, practical based on current knowledge of the nature of the plants :r animals involved. BIOLOGICAL SYSTEM A term re+'rring to either CROPPING SYSTEMS or LIVESTOCK SYSTEMS. BUSH FALLOW An intensive FALLOW SYSTEM with bush as the fallow vegetation. CATCH CROP A minor crop (in terms of output) planted after the major crop so as to catch remaining moisture or a market opportunity. It is a subclass c MULTIPLE CROPPING. CLIMATIC ANALYSIS The analysis of time-series data on such factors as precipitation, temperature, relative humidity, wind and radiation. COLLAtORATI'.iG FARMERS Farmeass chosen or tho have volunteered to cooperate with a FARMING SYSTEMS RESEARCH project by allowing researchers to conduct experiments on their farms, or by agreeing to test and evaluate new TECHNOLOGIES themselves. PAGE 2