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Título

Estimating the flux of nitrate in a sandy loam soil under corn

Autor Fernández Boy, E.; Cabrera, Francisco ; Murillo Carpio, José Manuel ; Moreno Lucas, Félix ; Cayuela, José Antonio ; Fernández Luque, José Enrique
Palabras clave Nitrate leaching
Monolith lysimeter
Water flux
Hydraulic conductivity
Soil water content
Fecha de publicación 1996
EditorKluwer Academic Publishers
Citación Fertilizers and Environment. Developments in plant and soil sciences 66: 457-461 (1996)
ResumenDrainage and nitrate leaching were determined in an undisturbed sandy loam soil contained in two monolith lysimeters (Ll and L2; 1.2 m deep) cropped with corn, irrigated, and fertilized with 510 and 175 kg N ha-1 in L1 and L2 respectively. Drainage was estimated at 0.9 m depth using Darcy's law and the hydraulic conductivity-soil water content relationship. Nitrate leaching at the same depth was obtained multiplying the estimated drainage by the nitrate concentration of the soil solution extracted with suction cups. A comparison between results from measurements at the bottom of lysimeters and that estimated at 0.9 m depth was made for the whole experimental period (March 1992-February 1993). The N03-N concentrations in the drainage water ranged between 2.8 and 151 mg 1-1 in L1 and between 0.1 and 34.4 mg 1-1 in L2. In the soil solution, they ranged between 5.9 and 240.3 mg NO3-N 1-1 in Ll and between 0.1 and 42.3 mg NO3-N 1-1 in L2. The total drainage at the bottom of lysimeters amounted to 139 and 203 mm and that estimated at 0.9 m depth amounted to 151 and 245 mm, in L1 and L2 respectively. Total NO3-N leached in L1 and L2 was 80 and 30 kg ha-1 respectively. The estimated amounts of NO3-N leached below 0.9 depth were 64 and 42 Kg ha-1 in L1 and L2 respectively. Total drainage and nitrate leached measured at the bottom were of the same order as the estimated values.
Descripción 5 páginas, 3 figuras, 1 tabla, 14 referencias.-- Proceedings of the International Symposium "Fertilizers and Environment", held in Salamanca, Spain, 26-29, september, 1994.
URI http://hdl.handle.net/10261/89562
ISBN 978-94-009-1586-2
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