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Título: | Border fertigation: field experiments and a simple model |
Autor: | Playán Jubillar, Enrique CSIC ORCID ; Faci González, José María | Fecha de publicación: | sep-1997 | Editor: | Springer Nature | Citación: | Irrigation Science 17 (4): 163-171 (1997) | Resumen: | Fertilizers 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. | Descripción: | 39 Pags.- 3 Tabls.- 11 Figs. The definitive version is available at: http://link.springer.com/journal/271 | Versión del editor: | http://dx.doi.org/10.1007/s002710050035 | URI: | http://hdl.handle.net/10261/101336 | DOI: | 10.1007/s002710050035 | ISSN: | 0342-7188 | E-ISSN: | 1432-1319 |
Aparece en las colecciones: | (EEAD) Artículos |
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PlayanE_IrrigatSci_1997.pdf | 137,91 kB | Adobe PDF | Visualizar/Abrir |
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