Libro-Agroecologia

Bibliografía327Groden, E. 1982. «The interactions of root maggots and two parasitoids, Alesacharas bileneata(Gyll) and Aphaerta pillipes (Say).» M.S. Thesis. East Lansing: Michigan State University.Habte, M., and M. Alexander. 1978. Protozoa density and the coexistence of protozoan predatorsand bacterial prey. Ecology 59: 140 146.Hall, M. H., and K. D. Kephart. 1991. Management of spring planted pea and triticale mixtures forforage production. J. Prod. Agric. 4: 213 218.Hansen, M., L. Busch, J. Burkhardt, W. B. Lacy, and L. R. Lacy. 1984. Plant breeding andbiotechnology. BioScience 36(1): 29 39.Hamilton, H., and S. Luk. 1993. Nitrogen transfers in a rapidly eroding agroecosystem: LoessPlateau, China. J. Environ. Qual. 22: 133 140.Hardin, G. 1968. The tragedy of the commons. Science 162: 1243 1248.Hargrove, W. L., and G. W. Thomas. 1981. Effect of organic matter on exchangeable aluminum andplant growth in acid soils. In: Chemistry in the Soil Environment. Wisconsin: Amer. Soc Agron.Special Publ. No. 40.Harlan, J. R. 1976. Genetic resources in wild relatives of crops. Crop Sci. 16: 329 333.Harper, J. L. 1977. Population Biology of Plants. New York: Academic Press.Hart, R. D. 1978. «Methodologies to produce agroecosystem management plans for small farmersin tropical environments.» Paper presented: Conf. on Basic Techniques in Ecological Agriculture,Third World Agric. Workshop, Int. Fed. Organic Agric. Movements, Montreal, Canada.. 1979. Agroecosistemas: Conceptos Basicos. Costa Rica: CATIE.Hartl, W. 1989. Influence of undersown clovers on weeds and on the yield of winter wheat inorganic farming. Agric., Ecosyst., Environ. 27: 389 396.Harwood, R. R. 1979a. Small Farm Development Understanding and Improv-ing Farming Systemsin the Humid Tropics. Boulder: Westview Press.. 1979b. The need for regional agriculture. The New Farm 1: 55 57.. 1984. «Organic farming research at the Rodale Research Center.» In: Organic Farming: CurrentTechnology and its Role in Sustainable Agriculture. Bezdicek, D. F., and J. F. Powers, eds.Wiscon- sin: Amer. Soc. Agron.Harwood, R. R., and E. C. Price. 1976. «Multiple cropping in tropical Asia.» In: Multiple Cropping.Papendick, R. I., P. A. Sanchez, and G. B. Triplett, eds. Wisconsin: Amer. Soc. Agron.Haynes, R. J. 1980. Influence of soil management practice on the orchard agroecosystem. Agroecosystems6: 3 32.Heath, M. E., R. F. Barnes, and D. S. Metcalf. 1985. Forages: The Science of GrasslandAgriculture. Ames: Iowa State Univ. Press.Hecht, S. B. 1985. Environment, development and politics: capital accumulation and the livestocksector in eastern Amazonia. World Development 13(6): 663 684.Heichel, G. H. 1978. Stabilizing agricultural energy needs: role of forages, rotations and nitrogenfixation. J. Soil and Water Conserv. Nov. Dec. pp. 279 282.Hesterman, O. B., T. S. Griffin, P. T. Williams, G. H. Harris, and D. R. Christenson. 1992. Foragelegume small grain intercrops: nitrogen production and response of subsequent corn. J. Prod.Agric. 5: 340 348.Hiebsch, C. K., and R. E. McCollum. 1987. Area x time equivalency ratio: a method for evaluatingthe productivity of intercrops. Agron. J. 79: 15 22.Hildebrand, P. 1979. «Generating technologies for traditional farmers: the Guatemalan experience.»In: Proc. IX Int. Congress of Plant Protection. Washington, D.C. pp. 31 34.. 1981. Combining disciplines in rapid appraisal: the Sandeo approach. Agriculture Administration8: 423 432.Hofstetter, R. 1984. Overseeding Research Results, 1982 1984. Agronomy Department Pennsylvania:Rodale Research Center.Holmes, C. W., G. F. Wilson, D. D. S. MacKenzie, D. S. Flux, I. M. Brookes, and A. W. F. Davey.1984. Milk Production From Pasture. New Zealand: Butterworths.Horwith, B. 1985. A role for intercropping in modern agriculture. BioScience 35(5): 286 291.House, G. J., and B. R. Stinner. 1983. Arthropods in no-tillage soybean agroecosystems: communitycomposition and ecosystem interactions. Env. Management 7: 23 28.