Alegre J.C., Cassel D.K. and Bandy D.E. 1988. Effect of land clearing method on chemical properties of an Ultisol in the Amazon. Soil Sci. Soc. Am. J. 52: 1283-1288.
Andriesse J.P. and Koopmans T.T. 1984. A monitoring study on nutrient cycles in soils used for shifting cultivation under various climatic conditions in tropical Asia. I. The influence of simulated burning on form and availability of plant nutrients. Agric. Ecosyst. Environ. 12: 1-16.
Andriesse J.P. and Schelhaas R.M. 1987. A monitoring study on nutrient cycles in soils used for shifting cultivation under various conditions in tropical Asia. III. The effects of land clearing through burning on fertility level. Agric. Ecosyst. Environ. 19: 311-332.
Boyle J.R. 1973. Forest soil chemical changes following fire. Commun. Soil Sci. Plant Anal. 4: 369-374.
Brinkman W.L. and do Nascimento J.C. 1973. The effect of slash and burn agriculture on plant nutrients in the Tertiary region of Central Amazonia. Turrialba 23: 284-290.
Clapham W.M. and Zilbilske L.M. 1992. Wood ash as a liming amendment. Commun. Soil Sci. Plant Anal. 23: 1209-1227.
Clesceri L.S., Greenberg A.E. and Eaton A.D. 1998. Standard methods for the examination of water and wastewater. American Public Health Association, New York.
de las Salas G. and Folster H. 1976. Bioelement loss on clearing a tropical rainforest. Turrialba 26: 179-186.
Durgin P.B. and Vogelsang P.J. 1984. Dispersion of kaolinite by water extracts of Douglas-fir ash. Can. J. Soil Sci. 64: 439-443.
Erich M.S. 1991. Agronomic effectiveness of wood ash as a source of phosphorus and potassium. J. Environ. Qual. 20: 576-581.
Erich M.S. and Ohno T. 1992. Titrimetric determination of calcium carbonate equivalence of wood ash. Analyst 117: 993-995.
Etiegni L., Campbell A. and Mahler R. 1991a. Evaluation of wood ash disposal on agricultural land. I. Potential as a soil additive and liming agent. Commun. Soil Sci. Plant Anal. 22: 243-256.
Etiegni L., Mahler R., Campbell A. and Shafii B. 1991b. Evaluation of wood ash disposal on agricultural land. II. Potential toxic effects on plant growth. Commun. Soil Sci. Plant Anal. 22: 257-267.
Ewel J., Berish C., Brown B., Price N. and Raich J. 1981. Slash and burn impacts on a Costa Rican wet forest site. Ecology 62: 816-829.
Gillman G.P. and Sumpter E.A. 1986. Modification to the compulsive exchange method for measuring exchange characteristics of soils. Aust. J. Soil Res. 24: 61-66.
Grundon N. 1997. Hungry Crops. Department of Primary Industries, Brisbane, Australia.
Hands M.R., Harrison A.F. and Bayliss-Smith T. 1995. Phosphorus dynamics in slash-and-burn and alley cropping systems of the humid tropics. In: Tiessen H. (ed.), Phosphorus in the Global Environment: Transfers, Cycles and Management. John Wiley and Sons, Chichester, UK, pp. 155-170.
Huang H., Campbell A.G., Folk R. and Mahler R.L. 1992. Wood ash as a soil additive and liming agent for wheat: field studies. Commun. Soil Sci. Plant Anal. 23: 25-33.
Humphreys F. and Craig F. 1981. Effects of fire on soil chemical, structural and hydrological properties. In: Gill A., Groves R. and Nobel I. (eds), Fire and the Australian Biota. Australian Academy of Science, Canberra, Australia, pp. 177-200.
Juo A.S.R. and Manu A. 1996. Chemical dynamics in slash-and-burn agriculture. Agric. Ecosyst. Environ. 58: 49-60.
Kahl J.S., Fernandez I.J., Rustad L.E. and Peckenham J. 1996. Threshold application rates of wood ash to an acidic forest soil. J. Environ. Qual. 25: 220-227.
Kang B.T. and Sajjapongse A. 1980. Effect of heating on properties of some soils from southern Nigeria and growth of rice. Plant Soil 55: 85-95.
Khanna P.K., Ludwig B. and Raison R.J. 1996. Comparing modelled and observed effects of ash additions on chemistry of a highly acid soil. Aust. J. Soil Res. 34: 999-1013.
Khanna P.K. and Raison R.J. 1986. Effect of fire intensity on solution chemistry of surface soil under Eucalyptus paucifloraforest. Aust. J. Soil Res. 1986: 423-434.
Kyuma K., Tulaphitak T. and Pairintra C. 1985. Changes in soil fertility and tilth under shifting cultivation. I. General description of soil and effect of burning on the soil characteristics. Soil Sci. Plant Nutr. 31: 227-238.
Lal R. and Cummings D.J. 1979. Clearing a tropical forest. I. Effects on soil and micro-climate. Field Crops Res. 1: 91-107.
Lerner B.R. and Utzinger J.D. 1986. Wood ash as soil liming material. HortScience 21: 76-78.
Lim C. and Jackson M. 1982. Dissolution for total elemental analysis. In: Page A., Miller R. and Keeney D. (eds), Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties. American Society of Agronomy/Soil Science Society of America, Madison, Wisconsin, pp. 1-12.
Lindsay W.L. 1979. Chemical Equilibria in Soils. John Wiley and Sons, New York.
Ludwig B., Khanna P.K., Holscher D. and Anurugsa B. 1999. Modelling changes in cations in the topsoil of an Amazonian Acrisol in response to additions of wood ash. Eur. J. Soil Sci. 50: 717-726.
Ludwig B., Khanna P.K., Raison R.J. and Jacobsen K.L. 1998. Modelling cation composition of soil extracts under ashbeds following intense slashfire in a eucalypt forest. For. Ecol. Manage. 103: 9-20.
Menzies N.W. and Gillman G.P. 1997. Chemical characterization of soils of a tropical humid forest zone: A methodology. Soil Sci. Soc. Am. J. 61: 1355-1363.
Motomizu S., Wakimoto T. and Toei K. 1983. Spectrophotometric determination of phosphate in river waters with molybdate and malachite green. Analyst 108: 361-367.
Naylor L. and Schmidt E. 1986. Agricultural use of wood ash as a fertilizer and liming material: field trials. TAPPI J. 69: 114-119.
Nye P.H. and Greenland D.J. 1964. Changes in soil after clearing a tropical forest. Plant Soil 21: 101-112.
Ohno T. 1992. Neutralization of soil acidity and release of phosphorus and potassium by wood ash. J. Environ. Qual. 21: 433–438.
Ohno T. and Erich M.S. 1990. Effect of wood ash application on soil pH and soil test nutrient levels. Agric. Ecosyst. Environ. 32: 223-239.
Olsen S.R. and Sommers L.E. 1982. Phosphorus. In: Page A.L., Miller R.H. and Keeney D.R. (eds), Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties Vol. 2nd. American Society of Agronomy/Soil Science Society of America, Madison, Wisconsin, pp. 403-430.
Parkhurst D.L. 1995. PHREEQC-A computer program for specia-. tion, reaction path, advective-transport, and inverse geochemical calculations. U.S. Department of the Interior, Lakewood, Colorado.
SAS 1996. SAS/STAT Release 6.11. SAS Institute Inc., Cary, North Carolina.
Searle P.L. 1988. The determination of phosphate-extractable sulphate in soil with an anion-exchange membrane. Commun. Soil Sci. Plant Anal. 19: 1477-1493.
Seubert C.E., Sanchez P.A. and Valverde C. 1977. Effects of land clearing methods on soil properties of an Ultisol and crop performance in the Amazon jungle of Peru. Trop. Agric. (Trinidad) 54: 307-321.
Steiner K.G. 1991. Overcoming soil fertility constraints to crop production in West Africa: Impact of traditional and improved cropping systems on soil fertility. In: Mokwunye A. (ed.), Alleviating Soil Fertility Constraints to Increased Crop Production in West Africa. Kluwer Academic Publishers, Dordrecht, The Netherlands, pp. 69-91.
Thomas P. and Wein R. 1994. Amelioration of wood ash toxicity and jack pine establishment. Can. J. For. Res. 24: 748-755.
Uhl C. and Jordan C.F. 1984. Succession and nutrient dynamics following forest cutting and burning in Amazonia. Ecology 65: 1476-1490.
van Reuler H. and Janssen B. 1993. Nutrient fluxes in the shifting cultivation system of south-west Cote d'Ivoire. I. Dry matter production, nutrient contents and nutrient release after slash and burn for two fallow vegetations. Plant Soil 154: 169-177.
van Reuler H. and Janssen B.H. 1996. Comparison of the fertilizing effects of ash from burnt secondary vegetation and of mineral fertilizers on upland rice in south-west Cote d'Ivoire. Fert. Res. 45: 1-11.