Abstract
A major tenet of agroforestry, that trees maintain soil fertility, is based primarily on observations of higher crop yields near trees or where trees were previously grown. Recently objective analyses and controlled experiments have addressed this topic. This paper examines the issues of tree prunings containing sufficient nutrients to meet crop demands, the timing of nutrient transfer from decomposition to intercrops, the percent of nutrients released that are taken up by the crop, and the fate of nutrients not taken up by the crop.
The amount of nutrients provided by prunings are determined by the production rate and nutrient concentrations, both depending on climate, soil type, tree species, plant part, tree density and tree pruning regime. A large number of screening and alley cropping trials in different climate-soil environments indicate that prunings of several tree species contain sufficient nutrients to meet crop demand, with the notable exception of phosphorus. Specific recommendations for the appropriate trees in a given environment await synthesis of existing data, currently only general guidelines can be provided.
Tree biomass containing sufficient nutrients to meet crop demand is not enough, the nutrients must be supplied in synchrony to crop needs. Nutrient release patterns from organic materials are, in part, determined by their chemical composition, or quality. Leguminous materials release nitrogen immediately, unless they contain high levels of lignin or polyphenols. Nonlegumes and litter of both legumes and nonlegumes generally immobilize N initially. There is little data on release patterns of other nutrients. Indices that predict nutrient release patterns will assist in the selection of species for synchronizing with crop demand and improve nutrient use-efficiency.
Field trials with agroforestry species ranging in quality show that as much as 80% of the nutrients are released during the course of annual crop growth but less than 20% is captured by the crop, a low nutrient-use efficiency. There are insufficient data to determine how much of the N not captured by the crop is captured by the trees or is in the soil organic matter, the availability of that N to subsequent crops, or how much of that N is lost through leaching, volatilization or denitrification. Longer term trials are needed.
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Aber J and Melillo J (1982) Nitrogen mineralization in decaying hardwood leaf litter as a function of initial nitrogen and lignin content. Canadian Journal of Botany 60:2263–2269
Bowen GD (1984) Tree roots and the use of soil nutrients. In: Bowen GD and Nambiar EKS (eds) Nutrition of Plantation Forests, pp 147–179. Academic Press, London, UK
Budelman A (1989) Nutrient composition of the leaf biomass of three selected woody leguminous species. Agroforestry Systems 8:39–51
CABI (1991) TREE-CD CAB International, Wallingford, UK
Cambardella CA and Elliott ET (1992) Particulate soil organic-matter changes across a grassland cultivation sequence. Soil Science Society of America Journal 56:777–783
Coe R (1994) Through the looking glass: 10 common problems in alley-cropping research. Agroforestry Today 6:9–11
Constantinides M and Fownes JH (1994) Nitrogen mineralization from leaves and litter of tropical plants: relationship to nitrogen, lignin and soluble polyphenol concentrations. Soil Biology and Biochemistry 26:49–55
Cornforth IS and Davis JB (1968) Nitrogen transformations in tropical soils. I. Mineralization of nitrogen-rich organic materials added to soil. Tropical Agriculture 45:211–221
Costa FJSA, Bouldin DR and Suhet AR (1990) Evaluation of N recovery from mucuna placed on the surface or incorporated in a Brazilian oxisol. Plant and Soil 124:91–96
Fernandes ECM, Davey CB and Nelson LA (1993) Alley cropping on an acid soil in the upper Amazon: mulch, fertilizer, and hedgerow root pruning effects. In: Ragland J and Lal R (eds) Technologies for Sustainable Agriculture in the Tropics. ASA Special Publication 56, pp 77–96. ASA, Madison, WI, USA
Fernandes ECM, Garrity DP, Szott LT and Palm CA (1994) Use and potential of domesticated trees for soil improvement. In: Leakey RRB and Newton AC (eds) Tropical Trees: The Potential for Domestication and the Rebuilding of Forest Resources, pp 137–147. HMSO, London, UK
Fox RH, Myers RJK and Vallis I (1990) The nitrogen mineralization rate of legume residues in soil as influenced by their polyphenol, lignin and nitrogen contents. Plant and Soil 129: 251–259
Frankenberger WT and Abdelmagid HM (1985) Kinetic parameters of nitrogen mineralization rates of leguminous crops incorporated into soil. Plant and Soil 87:257–271
Giller KE and Wilson KJ (1991) Nitrogen Fixation in Tropical Cropping Systems. CAB International, Wallingford, UK
Glasener KM (1991) Ammonia volatilization losses from tropical legume mulches. MSc thesis, North Carolina State University, Raleigh, NC, USA
Gutteridge RC (1992) Evaluation of the leaf of a range of tree legumes as a source of nitrogen for crop growth. Experimental Agriculture 26:195–202
Haggar JP, Tanner EVJ, Beer JW and Kass DCL (1993) Nitrogen dynamics of tropical agroforestry and annual cropping systems. Soil Biology and Biochemistry 25:1363–1378
Hairiah K, Van Noordwijk M, Santoso B and Syekhfani MS (1992) Biomass production and root distribution of eight trees and their potential for hedgerow intercropping on an ultisol in southern Sumatra. Agrivita 15:54–68
Handayanto E, Cadisch G and Giller KE (1994) Nitrogen release from prunings of legume hedgerow trees in relation to quality of the prunings and incubation method. Plant and Soil 160:237–248
Hassink, J (1995) Density fraction of macro-organic matter and microbial biomass as predictors of C and N mineralization. Soil Biology and Biochemistry (in press)
Heuvelop J, Fassbender HW, Alpizar L, Enriquez G and Folster H (1988) Modelling agroforestry systems of cacao (Theobroma cacao) in Costa Rica. II. Cacao and wood production, litter production and decomposition. Agroforestry Systems 6:37–48
Iritani WM and Arnold CY (1960) Nitrogen release of vegetable crop residues during incubation as related to their chemical composition. Soil Science 89:74–82
Janzen HH and McGinn SM (1991) Volatile loss of nitrogen during decomposition of legume green manure. Soil Biology and Biochemistry 23:291–297
Kachaka S, Vanlauwe B and Merckx R (1993) Decomposition and nitrogen mineralization of prunings of different quality. In: Mulongoy K and Merckx R (eds) Soil Organic Matter Dynamics and Sustainability of Tropical Agriculture, pp 199–208. John Wiley and Sons Ltd., West Sussex, UK
Kang BT, Wilson GF, and Sipkens L (1981) Alley cropping maize (Zea mays L.) and leucaena (Leucaena leucocephala LAM) in Southern Nigeria. Plant and Soil 63:165–179
Ladd JN, Oades JM and Amato M (1981) Distribution and recovery of nitrogen from legume residue decomposing in soils sown to wheat in the field. Soil Biology and Biochemistry 13: 251–256
Ladd JN, Amato M, jackson RB and Butler JHA (1983) Utilization by wheat crops of nitrogen from legume residues decomposing in soils in the field. Soil Biology and Biochemistry 15: 231–238
Melillo JM, Aber JD and Muratore JF (1982) Nitrogen and lignin control of hardwood leaf litter decomposition dynamics. Ecology 63:621–626
Mulongoy K and Van der Meersch MK (1988) Nitrogen contribution by leucaena (Leucaena leucocephala) prunings to maize in an alley cropping system. Biology and Fertility of Soils 6:282–285
Mulongoy K, Ibewiro EB, Oseni N, Kilumba AO, Opara-Nadi and Osunubi O (1993) Effect of management practices on alley-cropped maize utilization of nitrogen derived from prunings on a degraded alfisol in south western Nigeria. In: Mulongoy K and Merckx R (eds) Soil Organic Matter Dynamics and Sustainability of Tropical Agriculture, pp 223–230. John Wiley and Sons Ltd, West Sussex, UK
Myers RJK, Palm CA, Cuevas E, Gunatilleke IUN and Brossard M (1994) The synchronisation of nutrient mineralization and plant nutrient demand. In: Woomer PL and Swift MJ (eds) The Biological management of Tropical Soil Fertility, pp 81–116. John Wiley and Sons, West Sussex, UK
Nye PH and Greenland DJ (1960) The soil under shifting cultivation. Technical communication 51. Commonwealth Bureau of Soils, Harpenden, UK
Oglesby KA and Fownes JH (1992) Effects of chemical composition on nitrogen mineralization from green manures of seven tropical leguminous trees. Plant and Soil 143:127–132
Palm CA (1988) Mulch quality and nitrogen dynamics in alley cropping system in the peruvian Amazon. PhD dissertation, North Carolina State University, Raleigh, NC, USA
Palm CA and Sanchez PA (1990) Decomposition and nutrient release patterns of the leaves of three tropical legumes. Biotropica 22:330–338
Palm CA and Sanchez PA (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
Palm CA, McKerrow AJ, Glasener KM and Szott LT (1991) Agroforestry systems in lowland tropics: is phosphorus important? In: Tiessen H, Lopez-Hernandez D and Salcedo IH (eds) Phosphorus Cycles in Terrestrial and Aquatic Ecosystems. Regional Workshop 3: South and Central America, pp 134–141. Saskatchewan Institute of Pedology, Saskatoon, Canada
Rosecrance RC, Brewbaker JL and Fownes JH (1992) Alley cropping of maize with nine leguminous trees. Agroforestry Systems 17:159–168
Russo RO and Budowski G (1986) Effect of pollarding frequency on biomass ofErythrina poeppigiana as a coffee shade tree. Agroforestry Systems 4:145–162
Salazari A, Szott LT and Palm CA (1993) Crop-tree interactions in alley cropping systems on alluvial soils of the Upper Amazon Basin. Agroforestry Systems 22:67–82
Sanchez, PA (1976) Properties and Management of Soils in the Tropics. John Wiley and Sons, New York, NY, USA
Singh BB and Jones JP (1976) Phosphorus sorption and desorption characteristics of soil as affected by organic residues. Soil Science Society of America Journal 40: 389–394
Sisworo WH, Mitrosuhardjo MM, Rasjid H and Myers RJK (1990) The relative roles of N fixation, fertilizer, crop residues and soil in supplying N in multiple cropping systems in a humid, tropical upland cropping system. Plant and Soil 121: 73–82
Sitompul SM, Syekhfani MS and Van der Heide J (1992) Yield of maize and soybean in a hedgerow intercropping system. Agrivita 15: 69–75
Swain T (1979) Tannins and lignins. In: Rosenthal GA and Janzen DH (eds) Herbivores; Their Interactions with Secondary Plant Metabolites. Academic Press, New York, NY, USA
Swift MJ, Heal OW and Anderson JM (1979) Decomposition in Terrestrial Ecosystems. Studies in Ecology. University of California Press, Berkeley, CA, USA
Swift MJ (1987) Tropical Soil biology and Fertility: Interregional Research Planning Workshop. Biology International Special issue 13. IUBS, Paris, France
Szott LT, Fernandes ECM and Sanchez PA (1991) Soil-plant interactions in agroforestry systems. Forest Ecology and Management 45: 127–152
Thomas RJ and Asakawa NM (1993) Decomposition of leaf litter from tropical forage grasses and legumes. Soil Biology and Biochemistry 25: 1351–1361
Tian G, Kang BT and Brussaard L (1992a) Effects of chemical composition on N, Ca, and Mg release during incubation of leaves from selected agroforestry and fallow plant species. Biogeochemistry 16: 103–119
Tian G, Kang BT and Brussaard L (1992b) Biological effects of plant residues with contrasting chemical compositions under humid tropical conditions — decomposition and nutrient release. Soil Biology and Biochemistry 24: 1051–1060
Tian G, Kang BT and Brussaard L (1993) Mulching effect of plant residues with chemically contrasting compositions on maize growth and nutrients accumulation. Plant and Soil 153: 179–187
Van Noordwijk M, Sitompul SM, Hairiah K, Listyarini E and Syekhfani MS (1995) Nitrogen supply from rotational or spatially zoned inclusion of Leguminosae for sustainable maize production on an acid soil in Indonesia. Plant and Soil (in press)
Vandenbelt RJ (ed) (1992)Faidherbia albida in the West African Semi-Arid Tropics. ICRISAT, Patancheru, India
Vitousek PM and Sanford Jr RL (1986) Nutrient cycling in moist tropical forest. Annual Review of Ecology and Systematics 17: 137–167
Von Carlowitz PG, Wolf GV and Kemperman REM (1991) Multipurpose Tree Database: An Information and Decision Support System. ICRAF, Nairobi, Kenya
Yamoah CF, Agboola AA and Mulongoy K (1986a) Decomposition, nitrogen release and weed control by prunings of selected alley cropping shrubs. Agroforestry Systems 4: 229–246
Yamoah CF, Agboola AA and Wilson GF (1986b) Nutrient contribution and maize performance in alley cropping systems. Agroforestry Systems 4: 257–264
Young, A (1989) Agroforestry for Soil Conservation. International Council for Research and Agroforestry and CAB International, Wallingford, UK
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Palm, C.A. Contribution of agroforestry trees to nutrient requirements of intercropped plants. Agroforest Syst 30, 105–124 (1995). https://doi.org/10.1007/BF00708916
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DOI: https://doi.org/10.1007/BF00708916