00872nam a2200193 a 450000100080000000500110000800800410001910000190006024500360007925000110011526000340012630000230016052003910018365000160057465000250059065300230061565300190063865300210065716750082005-03-14       1983    bl uuuu      00u1 u    #d1 aRUTHENBERG, H.  aFarming systems in the tropics.  a3. ed.  aOxford: Clarendon Pressc1983  a424 p., il. color.  aSome characteristics of farming in a tropical environment. Shifting cultivation systems. Fallow systems. Ley systems and dairy systems. Systems with permanent upland cultivation. Systems with arable irrigation farming. Systems with perennial crops. Grazing systems. Tendencies in the development of tropical farming systems. Notes of methodology in cropping and farming system research.  aAgricultura  aProdução Agrícola  aAspecto econômico  aEconomia rural  aRegião Tropical