Abstract
Managed fallows which recover nutrients more rapidly than natural secondary vegetation may improve the performance of shifting agriculture systems operating under inadequately long fallow cycles. Our objective was to construct nutrient balances for the soil, vegetation, and litter compartments of six planted leguminous fallows and natural secondary vegetation during 53 months. The fallows were planted on a previously cultivated Ultisol (Acrisol) in the Peruvian Amazon and included:Centrosema macrocarpum (Centrosema),Pueraria phaseoloides (Pueraria),Stylosanthes guianensis (Stylosanthes),Desmodium ovalifolium (Desmodium),Cajanus cajan (Cajanus), andInga edulis (Inga). In addition, in the natural fallow treatment secondary vegetation was allowed to establish and grow naturally. Quantities of extractable P, K, Ca, and Mg, total N, and organic C in soil to a 45 cm depth, and macrouttrients in aboveground biomass, roots, and litter were estimated at fallow planting, at 8, 17, and 29 months afterward, and at fallow clearing (53 months). Total N stocks increased by 10% in the Stylosanthes, Desmodium, Pueraria, and Inga treatments, but changed little in the Cajanus, Centrosema and natural fallows. This difference was largely due to greater net increases in both soil and vegetation compartments in the former group of treatments. In the Inga, Desmodium, and natural fallows, total stocks of P and K at 53 months were about 40% to 80% greater and 12% greater, respectively, than initial values, but Ca and Mg stocks were reduced by 25% to 40%. In the other treatments, there was generally little change in P stocks, but large (30% to 60%) reductions in K, Ca, and Mg during the course of the fallow. Although there were net decreases of stocks of P, K, Ca, and Mg in soil in all treatments during the fallow, storage of P and K in vegetation and litter in the Inga, Desmodium, and natural fallows offset losses of these nutrients from soil. These treatments also tended to accumulate more Ca and Mg in biomass and litter than the other treatments. These results suggest that leguminous fallow vegetation that accumulates large amounts of biomass may increase N, P, and K stocks, but that incomplete recuperation of Ca and Mg may limit the sustainability of short-rotation fallow-based systems on acidic, infertile soils. ei]Section editor: G R Stewart
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References
Adepetu J A and Corey R B 1976 Organic phosphorus as a predictor of plant-available phosphorus in soils of southern Nigeria. Soil Sci. 122, 159–164.
Adepetu J A and Corey R B 1977 Changes in N and P availability and P fractions in Two soils from Nigeria under shifting cultivation. Plant and Soil 46, 309–316.
Aweto A O 1981a Organic matter build-up in fallow soil in a part of south-western Nigeria and its effects on soil properties. J. Biogeogr. 8, 67–74.
Aweto A O 1981b Secondary succession and soil fertility restoration in south-western Nigeria. II. Soil fertility restoration. J. Ecol. 69, 609–614.
Ayarza M A 1988 Potassium dynamics in a humid tropical pasture in the Peruvian Amazon. Ph. D. dissertation. Department of Soil Science, North Carolina State University, Raleigh, North Carolina, USA.
Bartholomew W J, Meyer J and Laudelout H 1953 Mineral nutrient immobilization under forest and grass fallow in the Yangambi (Belgian Congo) region. Congo Belge. Inst. Natl. Etude Agron., Serie Sci. 57, 27 p.
Beck M A and Sanchez P A 1994 Soil phosphorus fraction dynamics during 18 years of cultivation on a Typic Paleudult. Soil Sci. Soc. Am. J. 58, 1424–1431.
Binkley D 1988 Forest Nutrition Management. John Wiley and Sons, New York, USA. 283 p.
Bremner J M and Mulvaney C S 1982 Nitrogen-Total.In Methods of Soil Analysis, Part 2. Chemical and Microbiological Properties. DnSecond Edition. Series 9. Eds. A LPage, R H Miller and D RKeeney. pp 595–641. American Society of Agronomy, Madison, USA.
Brubacher D, Arnason J T and Lambert J D H 1989 Woody species and nutrient accumulation during the fallow period of milpa farming in Belize, C.A. Plant and Soil 114, 165–172.
Cerri C C, Volkoff B and Andreaux F 1991 Wature and behavior of organic matter in soil under natural forest, and after deforestation, burning and cultivation near Manaus. For. Ecol. Manage. 38, 247–257.
Denevan W R and Padoch C 1987 Swidden-Fallow Agroforestry in the Peruvian Amazon, Advances in Economic Botany. NY Botanical Gardens, NY, USA.
Giller K E and Wilson K J 1991 Nitrogen Fixation In Tropical Cropping Systems. CAB INternational, Wallingford, UK. 313 p.
Hunter A H 1979 Suggested soil and plant analytical techniques for tropical soils research program labs. Agro Services International, Inc., Orange City FL, USA.
Jaffre T 1985 Composition minérale et stocks de bioéléments dans la biomasse épigée de recrus foresters en Cote-d'Ivoire. Oecol. Plant. 6, 233–246.
Jaiyebo E O and Moore A W 1964 Soil fertility and nutrient storage in different soil-vegetation systems in a tropical rainforest environment. Trop. Agric. St. Augustine 41, 129–139.
Jordan C F 1985 Nutrient Cycling in Tropical Moist Forest Ecosystems. John Wiley and Sons, New York, NY, USA. 190 p.
Jordan C F (ed) 1989 An Amazonian Rain Forest. Man and the Biosphere Series, Vol. 2. UNESCO and Parthenon Publishing, Paris, France. 176 p.
Juo A S R and Lal R 1977 Soil fertility and nutrient storage in different soil-vegetation systems in a tropical rainforest environment. Plant and Soil 47, 567–584.
Lal R, Wilson G F and Okigbo B N 1979 Changes in properties of an Alfisol produced by various cover crops. Soil Sci. 127, 377–382.
Lambert J D H and Arnason J T 1986 Nutrient dynamics in milpa agriculture and the role of weeds in initial stages of secondary vegetation in Belize, C.A. Plant and Soil 93, 303–322.
Miller H G 1984 Dynamics of nutrient cycling in plantation forests.In Nutrition of Plantation Forests. Eds. G FBowen and E K SNambiar. pp 53–78. Academic Press, London, UK.
Mobbs D C and Cannell M G R 1995 Optimal tree fallow rotations: some principles revealed by modelling. Agrofor. Syst. 29, 113–132.
Nye P H and Hutton R G 1957 Some preliminary analyses of fallows and cover crops at the West African Institute for Oil Palm Research, Benin. J. West Afr. Inst. Oil Palm Res. 2, 237–243.
Olsen S R and Sommers L E 1982 Phosphorus.In Methods of Soil Analysis, Part 2. Chemical and Microbiogical Properties. Second Edition. Series 9. Eds. A LPage, R HMiller and D RKeeney, pp 403–430. American Society of Agronomy, Madison, WI, USA.
Raintree J B 1986 Agroforestry pathways. Land tenure, shifting cultivation, and sustainable agriculture. Unasylva 38, 2–15.
Ramakrishnan P S and Toky O P 1981 Soil nutrient status of hill agroecosystems and recovery pattern after slash and burn agriculture (jhum), in north-eastern India. Plant and Soil 60, 41–64.
Szott L T, Palm C A and Davey C B 1994 Biomass and litter accumulation under managed and natural tropical fallows. For. Ecol. Manage. 67, 177–190.
Tiessen H, Stewart J W B and Cole C V 1984 Phosphorus transformations in soils of differing pedogenesis. Soil Sci. Soc. Am. J. 48, 853–858.
Toky O P and Ramakrishnan P S 1983 Secondary succession following slash and burn agriculture in north-eastern India. II. Nutrient cycling. J. Ecol. 71, 747–757.
Tyler E J 1975 Genesis of the soils within a detailed soil survey area in the upper Amazon basin, Yurimaguas, Peru. PhD dissertation, North Carolina State University, Raleigh, North Carolina, USA. 165 p.
Uribe E and Cox F 1988 Soil processes affecting the availability of potassium in highly weathered soils. Soil Sci. Soc. Am. J. 52, 148–152.
Wadsworth G, Reisenauer H M, Gordon D R and Singer M J 1990 Effects of length of forest fallow on fertility dynamics in a Mexican ultisol. Plant and Soil 122, 151–156.
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Szott, L.T., Palm, C.A. Nutrient stocks in managed and natural humid tropical fallows. Plant Soil 186, 293–309 (1996). https://doi.org/10.1007/BF02415525
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DOI: https://doi.org/10.1007/BF02415525