Cycling nitrogen for productivity in agroforestry; nitrogen, lignin and polyphenol control on mineralization
Soil productivity in the Humid Tropics depends on conservation and recycling of nutrients within the soil-plant system. In agroforestry systems, efficient use of organic fertilizers requires that nutrient release from them be timed for maximum uptake by crops and minimal leaching or gaseous loss. Chemical constituents such as nitrogen (N), lignin (L), and polyphenols (PP) are controls on rates of N release. Patterns of N release from the prunings of two tree species and one herbaceous legume were investigated in relation to the chemical characteristics of the materials. Also, N distribution in the soil following slash and burn disturbance was documented. Mixing of pruning types reduced the predictability of N release; interaction between mixed components was consistent with the action of soluble polyphenols. Overall, L+PP:N ratio was the best chemical index for prediction of N release. Slash and burn disturbance resulted in a mineral N flush in the first metre of soil; some of this N was leached below one metre
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| Format: | biblioteca |
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Edmonton, Alberta (EUA)
1999
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| Subjects: | AGROFORESTERIA, FIJACION DEL NITROGENO, CICLO BIOGEOQUIMICO, RELACIONES PLANTA SUELO, PROPIEDADES FISICO-QUIMICAS, PODA, CULTIVO MIGRATORIO, FERTILIDAD DEL SUELO, LIGNINAS, POLIFENOLES, MINERALIZACION, |
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