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vol.11 número2THE INFLUENCE OF ARBUSCULAR MYCORRHIZAL COLONIZATION ON THE GROWTH PARAMETERS OF CAPE GOOSEBERRY (Physalisperuviana L.) PLANTS GROWN IN A SALINE SOILBIOFERTILIZERS AND COMPOSTING ACCELERATORS OF POLLUTING MACROPHYTES OF A COLOMBIAN LAKE índice de autoresíndice de materiabúsqueda de artículos
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Journal of soil science and plant nutrition

versión On-line ISSN 0718-9516

Resumen

SALAZAR, Osvaldo; WESSTROM, Ingrid  y  ABRAHAM, Joel. IDENTIFICATION OF HYDROLOGICAL FACTORS CONTROLLING PHOSPHORUS CONCENTRATION IN DRAINAGE WATER IN SANDY SOILS. J. Soil Sci. Plant Nutr. [online]. 2011, vol.11, n.2, pp.31-46. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162011000200004.

The relationship between total phosphorus (TP) and molybdate-reactive phosphorus (MRP) concentrations in subsurface drainage waters in the hydrological conditions prevailing during autumn and spring flow events was statistically analysed using multiple linear regression analysis. Data on hydrological conditions in three drainage experimental plots in a loamy sand in south-east Sweden complemented with DRAINMOD-predicted data were used as independent variables. Regression models explained at least 80% of the variation in TP and MRP concentrations in drain outflow, based on adjusted coefficient of determination (R2adj) calculations. DRAINMOD-predicted cumulative infiltration (INFILcum) was identified as the most important hydrological condition controlling TP and MRP concentrations in drain outflow in three autumn events and in two out of three spring events. This suggests that the first infiltrating water found more soluble P forms available for transport, after which TP and MRP concentration in drainage outflows gradually decreased during the flow events.

Palabras clave : Controlled drainage; DRAINMOD; Matrix flow; Preferential flow; Subsurface flow.

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