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

AuthorsFernández Boy, E.; Cabrera, Francisco ; Murillo Carpio, José Manuel ; Moreno Lucas, Félix ; Cayuela, José Antonio ; Fernández Luque, José Enrique
KeywordsNitrate leaching
Monolith lysimeter
Water flux
Hydraulic conductivity
Soil water content
Issue Date1996
PublisherKluwer Academic Publishers
CitationFertilizers and Environment. Developments in plant and soil sciences 66: 457-461 (1996)
AbstractDrainage 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.
Description5 páginas, 3 figuras, 1 tabla, 14 referencias.-- Proceedings of the International Symposium "Fertilizers and Environment", held in Salamanca, Spain, 26-29, september, 1994.
Appears in Collections:(IRNAS) Libros y partes de libros
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