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Título

Border fertigation: field experiments and a simple model

AutorPlayán Jubillar, Enrique ; Faci González, José María
Fecha de publicaciónsep-1997
EditorSpringer
CitaciónIrrigation Science 17 (4): 163-171 (1997)
ResumenFertilizers are commonly dissolved in border irrigation water. However, there are no available procedures for the proper design and management of surface fertigation. A series of experiments was conducted to determine the uniformity of fertilizer application under varying inflow discharges and fertilizer application times in blocked-end borders. Results from the fertigation evaluations showed that the fertilizer distribution uniformity of the low half (DULH) ranged from 2.9 to 51.6%, while water DULH ranged from 63.5 to 96.9%. A simplified border fertigation model based on one-dimensional convection was formulated and applied to the simulation of the experiments. The model was able to explain 43.8% of the variability in the fertilizer DULH. Application of the model to selected case studies revealed that short-duration applications, such as those resulting from instantaneous release of fertilizer into the irrigation stream, often produce low uniformities. This is particularly true for early applications in blocked-end borders and for early and late applications in level basins. In both irrigation systems, application of fertilizer at a constant rate during the entire irrigation event is frequently the best solution. In the presence of runoff, the model can be used to find a compromise between fertilizer application uniformity and runoff losses. Finally, if large deep percolation losses are expected, the model can identify uniform fertigation options based on late applications of fertilizer.
Descripción39 Pags.- 3 Tabls.- 11 Figs. The definitive version is available at: http://link.springer.com/journal/271
Versión del editorhttp://dx.doi.org/10.1007/s002710050035
URIhttp://hdl.handle.net/10261/101336
DOI10.1007/s002710050035
ISSN0342-7188
E-ISSN1432-1319
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