Libro-Agroecologia

Bibliografía337Trenbath, B. R. 1983. «The dynamic properties of mixed crops.» In: Frontiers of Research inAgriculture. S. K. Roy, ed. India: Indian Stat. Inst. pp. 265 286.Tripathi, B. and C. M. Singh. 1983. Weed and fertility management using maize/soyabeanintercropping in the northwestern Himalayas. Trop. Pest Manage. 29(3): 267 270.Tripathi, R. S. 1977. Weed problems an ecological perspective. Trop. Ecol. 18: 138 148.Tripp, R., and J. Woolley. 1989. The Planning Stage of On-farm Research: Identifying Factors forExperimentation. Mexico: CIMMYT-CIAT.Troeh, F. R., J. A. Hobbs, and R. L. Donahue. 1980. Soil and Water Conservation for Productivityand Environmental Protection. New York: Prentice Hall.Trujillo Arriaga, J., and M. A. Altieri. 1990. A comparison of aphidopha-gous arthropods on maizepolycultures and monocultures in central Mexico. Agriculture, Ecosystems and Environment31: 337 349.Tustin, J. R., R. L. Knowles, and B. K. Klomp. 1979. Forest farming: a multiple land-use productionsystem in New Zealand. For. Ecol. Manage. 2: 169 189.Uhl, C. 1983. Nutrient uptake and nutrient retention related characteristics of common successionalspecies in the upper Rio Negro region of the Amazon basin. (unpub. manuscript).Uhl, C., and C. Jordan. 1984. Vegetation and nutrient dynamics during the first five years ofsuccession following forest cutting and burning in the Rio Negro region of Amazonia. Ecology65: 1476 1490.Uhl, C., R. Buschbacher, and A. Serrao. 1988. Abandoned pastures in Amazonia. I. Patterns of plantsuccession. J. Ecology 76: 663 681.Uhl, C., and P. Murphy. 1981. A comparison of productivities and energy values between slash andburn agriculture and secondary succession in the upper Rio Negro region of the Amazon Basin.Agro ecosystems 7: 63 83.Unamma, R. P. A., T. Enyinnia, and J. F. Emezie. 1985. Critical period of weed interference incocoyam/ maize/sweet potato intercrop. Trop. Pest Manage. 31: 21 23.USDA (United States Department of Agriculture). 1973. Monoculture in Agriculture: Extent,Causes, and Problems Report of the Task Force on Spatial Heterogeneity in AgriculturalLandscapes and Enterprises. Washington, D.C.: USDA.. 1980. Report and Recommendations on Organic Farming. Washing-ton, D. C.: USDAvan den Bosch, R., and A. D. Telford. 1964. «Environmental modification and biological control.» In:Biological Control of Insect Pests and Weeds. P. DeBach, ed. New York: Reinhold, pp. 459 488.Vandermeer, J. 1981. The interference production principle: an ecological theory for agriculture.BioScience 31: 361 364.. 1989. The Ecology of Intercropping. Cambridge, U.K. Cambridge Univ. Press,van Dyne, G. M. 1969. The Ecosystem Concept in Natural Resource Manage-ment. New York:Academic Press.van Emden, H. F. 1965. The role of uncultivated land in the biology of crop pests and beneficialinsects. Sci. Hort. 17: 121 136.Vanderplank, J. E. 1982. Host-pathogen Interactions in Plant Disease. New York: Academic Press.Vink, A. P. A. 1975. Land Use in Advancing Agriculture. New York: Springer-Verlag.Visser, T., and M. K. Vythilingam. 1959. The effect of marigolds and some other crops on thePratylenchus and Meloidogyne populations in tea soil. Tea Quart. 30: 30 38.Voisin, A. 1959. Grass Productivity. New York: Philosophical Library. Reprinted, 1988, Washington,D. C.: Island Press.. 1960. Better Grassland Sward. London: Crosby Lockwood and Son.Vrabel, T. E., P. L. Minotti, and R. D. Sweet. 1980. Seeded legumes as living mulches in sweet corn.Proc. N.E. Weed Sci. Soc. 34: 171 175.Wade, M. K., and P. A. Sanchez. 1984. Productive potential of an annual intercropping scheme inthe Amazon. Field Crops Res. 9: 253 263.Wall, G. J., E. A. Pringle, and R. W. Sheard. 1991. Intercropping red clover with silage corn for soilerosion control. Can. J. Soil Science. 71: 137 145.Wasserstrom, R. 1982. Land and Labor in Chiapas. Berkeley: Univ. Calif. Press.