REFERENCES

Abelson P.H. and Rowe J.W. 1987. A new agricultural frontier. Science 235:1450-1451.

Bouwman A.F. ed. 1990. Soils and the greenhouse effect. New York: Wiley.

EPA (Environmental Protection Agency). 1990. Greenhouse gas emission from agricultural systems, vols. 1 and 2. Washington, DC: EPA.

Gillis M. and Repetto R. 1988. Deforestation and government policy. Cambridge: Cambridge University Press.

Goedert W.J. 1983. Management of the Cerrado soils of Brazil: a review. Journal of Soil Science 34:405-428.

Hauck F.W. 1974. Shifting cultivation and soil conservation in Africa. FAO Soils Bulletin 24:1-4. 

Hecht S.B. 1979. Spontaneous legumes and developed pastures in the Amazon and their forage potential. In: Sanchez P.A. and Tergas L.E. eds. Pasture production in acid soils of the tropics. Cali, Colombia: CIAT. 65-79.

Houghton R.A., Boone R.D., Fruci J.R., Hobbie J.E., Melillo J.M., Palm C.A., Petersen B.J., Shaver G.R. and Woodwell G.M. 1987. The flux of carbon from terrestrial ecosystems to the atmosphere in 1980 due to changes in land use: geographic distribution of the global flux. Tellus 39B:122-139.

Huntley B.J. 1982. Southern African savannas. In: Huntley B.J. and Walker B.H. eds. Ecology of tropical savannas. Ecological Studies vol. 42. Berlin: Springer Verlag. p 101-110.

Juo A.S.R. and Law R. 1977. The effect of fallows and continuous cultivation on the chemical and physical properties of an Alfisol in western Nigeria. Plant and Soil 47:567-584.

Jurion F. and Henry J. 1969. Can primitive farming be modernised? Brussels: Institut National pour Etude Agronomique du Congo.

Kang B.T., Reynouds L. and Atta-Krah A.N. 1990. Alley farming. Advances in Agronomy 43.315-339.

Kartasubrata, J. 1991. Deforestation and sustainable land use development in Indonesia. Indonesia: Bogor Agricultural University.

Lal R. 1991. Myths and scientific realities of agroforestry as a strategy for sustainable management of soils in the tropics. Advances in Soil Science 13:91-132.

Lal R., P.A. Sanchez and R.W Cummings Jr. eds. 1986. Land clearing and development in the tropics. Rotterdam: Balkema.

Lungu O.I. 1987. A review of soil productivity research in high rainfall areas of Zambia. NORAGRIC Occasional Paper No. 8, Series A. Aas: Agricultural University of Norway.

MacIntosh J.L., Ismail I.G., Effendi S. and Sudjadi M. 1981. Cropping systems to preserve fertility of red-yellow Podzolic soils in Indonesia. International Symposium on Distribution, Characterization and Utilization of Problem Soils. Tsukuba, Japan: TARC.

Mahar D. 1988. Government policies and deforestation in Brazil, Amazon Region. World Bank Environment Department Working Paper No. 7. Washington, DC: World Bank.

Myers N. 1989. Deforestation rates in tropical forests and their climatic implications. London: Friends of the Earth.

Nye P.H. and Greenland D.J. 1960. The soil under shifting cultivation. Commonwealth Bureau of Soils Technical Communication 51, Harpenden, U.K.

Palm C.A. and Sanchez P.A. 1991. Nitrogen release from the leaves of some tropical legumes as affected by their lignin and polyphenolic contents. Soil Biology and Biochemistry 23:83-88.

Ramakrishnan P.S. 1984. The science behind rotation bush fallow agricultural system (jhum). Proceedings Indian Academy of Sciences (Plant Sciences) 93(3):79-400.

Ramakrishnan P.S. 1987. Shifting agriculture and rainforest ecosystem management. Biology International 15:17-18.

Sajise P.E. 1980. Alang-alang (Imperata cyclindrica) and upland agriculture. Biotropica Special Publ. 5:35-6.

Sanchez P.A. 1976. Properties and management of soils in the tropics. New York: Wiley.

Sanchez P.A. 1987. Management of acid soil in the humid tropics of Latin America. In: Sanchez P.A., Stoner E.R. and Pushparajah E. eds. Management of acid tropical soils for sustainable agriculture. IBSRAM Proceedings 2:63-107. Bangkok, Thailand: IBSRAM.

Sanchez P.A. and Benites J.R. 1987. Low-input cropping for acid soils of the humid tropics. Science 238:1521-1527.

Sanchez P.A., Palm C.A. and Smyth T.J. 1990. Approaches to mitigate tropical deforestation by sustainable soil management practices. In: Schapenseel H.W., Schomarker M. and Ayoub A. eds. Soils on a warmer earth. Developments in Soil Science 20:211-220. Amsterdam: Elsevier.

Sanchez P.A., Stoner E.R. and Pushparajah E. eds. 1987. Management of acid tropical soils for sustainable agriculture (Yurimaguas-Brazilia Workshop). IBSRAM Proceedings No. 2. Bangkok: IBSRAM.

Sanchez P.A., Swift M.J., Buol S.W., Dvorak K.A., Lathan M. and Mokwunye U. 1991. Soils research in Africa: a report to the Rockfeller Foundation. New York: Rockfeller Foundation.

Sanchez P.A., Vilachica J.H. and Bandy D.E. 1983. Soil fertility dynamics after clearing a tropical rainforest in Peru. Soil Science of America Journal 47:1171-1178.

Serrao E.A.S., Falesi I.C., Veiga J.B. and Texeira J.F. 1979. Productivity of cultivated pastures in low fertility soils of the Amazon of Brazil. In: Sanchez P.A. and Tergas L.E. eds. Pastures production in acid soils of the tropics. Cali, Colombia: CIAT. p 195-226.

Seubert C.E., Sanchez P.A. and Valverde C. 1977. Effects of land clearing methods and soils properties of an Ultisol and crop performance in the Amazon jungle of Peru. Tropical Agriculture 54:307-321.

Smyth T.J. and Bastos J. B. 1984. Alteracoes na fertilidade em um latossolo amarelo alico pela queima da vegetacao. Revista Brasileira de Ciencia do Solo 8:127-132.

SPRP (Soil Productivity Research Programme). 1987, 1988. Annual research reports from 1983-86; 1987 and 1988. Misamfu Regional Research Station, Kasama, Zambia.

Swift M.J. ed. 1987. Tropical soil biology and fertility: interregional research planning workshop, Yurimaguas, Peru. Biology International Special Issue 13. Paris: IUBS.

Szott L.T. and Palm C.A. 1986. Soils and vegetation dynamics in shifting cultivation fallows. In: I Simposio do Tropico Umido 1:360-379. Belem, Brazil: EMBRAPA.

Szott L.T., Palm C.A. and Sanchez P.A. 1991. Agroforestry in acid soils of the humid tropics. Advances in Agronomy 45:275-301.

Toky O.P. and Ramakrishnan P.S. 1981. Cropping and yields in agricultural systems of the northeastern hill region of India. Agro Ecosystems 7:11-25.

Von Uexkull H.R. 1990. Phosphorus important in rehabilitation of anthropic savanna (alang-alang land). Better Crops International June 1990, p 12-15.

Von Uexkull J.R. 1984. Managing Acrisols in the humid tropics. Food and Fertilizer Technology Centre Book Series 27. Taipei, Taiwan: FFTC. p 382-397.

Wade M.K., Gill D.W., Subagjo H., Sudjadi M. and Sanchez P.A. 1988. Overcoming soil fertility constraints in a transmigration area of Indonesia. TropSoils Bulletin 88-01. Raleigh: North Carolina State University.

Woomer P.L. and Ingram J.S.I. 1990. The biology and fertility of tropical soils. TSBF Report. Nairobi, Kenya: TSBF.

Yamoah C.F., Agboola A.A., Wilson G.E. and Mulungoy K. 1986. Soil properties as affected by the use of leguminous shrubs for alley cropping with maize. Agriculture, Ecosystems and the Environment 18:167-177.