agriculture is the production of plants and animal useful to man. it includes tilling conserving . improving and reclaiming the soil . breeding better plants and animals . protecting plants and animals from diseases and predators . and caring for them . The main branches of agriculture are agronomy or the growing of field crops animal husbandry horticulture and forestry . But apart from these major divisions agriculture has ramifications almost without end . in its widest sense it embraces processing transporting and marketing agricultural product and it is served not only by farmer ranchers gardeners and foresters but also by engineers biologists and other scientists and by markers of farm implements and machinery and by other manufacturers