Libro-Agroecologia

332Agroecología: Bases científicas para una agricultura sustentable. 1992b. Winter pugging. Allan’s observations. Stockman Grass Farmer 49(10): 20 21.. 1992c. Wet weather grazing tips. Stockman Grass Farmer 49: 17.. 1993. Spring pasture management similar to flying a jet. Stockman Grass Farmer 50(4): 1, 8.National Academy of Sciences (NAS). 1977. Leucaena: Promising Forage and Tree Crop for theTropics. Washington, D.C.: NAS.National Research Council. 1984. Alternative Agriculture. Washington, D. C.: National AcademyPress.Netting, R. Mc. 1974. Cultural Ecology. California: Cummings.. 1974. Agrarian ecology. Ann. Rev. Anth. 1: 21 55.Nettles, W. C. 1979. Eucelatoria sp. females: factors influencing response to cotton and okra plant.Environmental Entomology 8: 619 623.Norgaard, R. B. 1994. Development Betrayed: The End of Progress and a CoevolutionaryRevisioning of the Future. New York: Routledge.Norman, D. W. 1977. The rationalization of intercropping. African Envir. 2(4)/3(1): 97 109.. 1979. «The farming systems approach: relevancy for small farmers.» In: Increasing the Productivityof Small Farms. H. S. Karaspan, ed. Lahore: Pakistan Centro. pp. 37 49.Norman, M. J. T. 1979. The Rationalization of Intercropping. Gainesville: University Presses ofFlorida.Nye, P. H. and D. J. Greenland. 1961. The Soil Under Shifting Cultivation. England: Comm. Agri.Bur.Obiefuna, J. C. 1989. Biological weed control in plantains (Musa AAB) with egusi melon(Colocynthis citrullus L.). Biol. Agric. Hort. 6: 221 227.O’Brien, T. A., J. Moorley, and W. J. Whittington. 1967. The effect of management and competitionon the uptake of 32P by ryegrass, meadow fescue and their natural hybrid. Journal of AppliedEcology 4: 513 520.Odum, E. P. 1984. «Properties of agroecosystems.» In: Agricultural Ecosystems. Lowrance et al.,eds. New York: Wiley InterscienceOelhaf, R. C. 1978. Organic Agriculture. New Jersey: Allanheld, Osmun and Co. Pub., Inc.Office of Technology Assessment, United States Congress. 1990. Beneath the Bottom Line:Agricultural Approaches to Reduce Agricultural Contamination of Groundwater. Wash., D. C.:U.S. Govt. Printing Office.Ofori, F., and W. R. Stern. 1987. Cereal-legume intercropping systems. Adv. Agron. 41: 41 90.Okigbo, B. N., and D. J. Greenland. 1976. «Intercropping systems in tropical Africa.» In: MultipleCrop- ping. R. I. Papendick, P. A. Sanchez and G. B. Triplett, eds. Wisconsin: Amer. Soc.Agron.Oldeman, R.A.A. 1981. «The design of ecologically sound agroforests.» In: Viewpoints onAgroforestry. K. F. Wiersum, ed. The Netherlands: Ag. Univ. Wageningen.Oostenbrink, M., K. Kuiper, and J. J. S’Jacob. 1957. Tagetes als feindpflanzen von PratylenchusArten. Nematologica 2, Suppl: 424 433.Osiru, D. S. O., and R. W. Willey. 1972. Studies on mixtures of dwarf sorghum and beans withparticular reference to plant population. J. Agri. Sci. 79: 531 540.Palada, M. C., S. Ganser, R. Hofstetter, B. Volak, and M. Culik. 1983. «Association of interseededlegume cover crops and annual row crops in year-round cropping systems.» In: EnvironmentallySound Agriculture. W. Lockeretz, ed. New York: Praeger.Palada, M. C., B. T. Kang, and S. L. Classen. 1992. Effect of alley cropping with Leucaenaleucocephala and fertilizer application on yield of vegetable crops. Agroforestry Syst. 19: 139147.Palmer, R., and N. Parsons. 1977. The Roots of Rural Poverty in Central and Southern Africa.Berkeley: Univ. Calif. Press.Palti, J. 1981. Cultural Practices and Infectious Crop Diseases. New York: Springer Verlag.Papadakis, J. 1938. Compendium of Crop Ecology. Buenos Aires, Argentina.. 1941. Small grains and winter legumes grown mixed for grain production. J. Amer. Soc. Agron.33: 504 511.