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Título

Low-pressure sprinkler irrigation in maize: Differences in water distribution above and below the crop canopy

AutorZapata Ruiz, Nery ; Robles, Octavio; Playán Jubillar, Enrique ; Paniagua Antón, Pilar ; Romano González, César; Salvador Esteban, Raquel ; Montoya Sevilla, Francisco
Palabras claveCatch-cans
Stemflow
Throughfall
Irrigation uniformity
Low-pressure
Wind drift and evaporation losses
Fecha de publicaciónabr-2018
EditorElsevier
CitaciónZapata N, Robles O, Playán E, Paniagua P, Romano C, Salvador R, Montoya F. Low-pressure sprinkler irrigation in maize: Differences in water distribution above and below the crop canopy. Agricultural Water Management 203: 353-365 (2018)
ResumenReducing the working pressure at the sprinkler nozzles is one of the alternatives to reduce energy requirements in solid-set sprinkler irrigation systems. Previous studies reported ≈10% lower seasonal Christiansen uniformity coefficient (CUC) for low-pressure treatments than for standard treatments, but no differences in maize yield. This research analyses the effect of maize canopy water partitioning on irrigation performance indexes (CUC and wind drift and evaporation losses, WDEL). Three irrigation treatments were considered, based on the working pressure: 1) A standard brass impact sprinkler operating at a pressure of 300 kPa (CIS300); 2) A standard brass impact sprinkler operating at a pressure of 200 kPa (CIS200); and 3) A modified plastic impact sprinkler (with a deflecting plate attached to the drive arm) operating at a pressure of 200 kPa (DPIS200). Irrigation performance was measured using a catch-can network located above the maize canopy (CUCac, WDELac) along the whole crop season and using stemflow and throughfall devices below the maize canopy (CUCbc, WDELbc) in eight irrigation events. Maize growth, yield and its components were measured. Under low-wind and fully developed canopy conditions (a frequent situation for maize irrigation), CUCbc resulted higher than CUCac for the low-pressure treatments, while the opposite was observed for the standard pressure treatment. Maize canopy partitioning reduces the differences in irrigation performance indexes between pressure treatments, explaining why there are no differences in grain yield between them. Caution should be used when measuring sprinkler irrigation performance above tall canopies, since the elevation of the catch-cans and the crop canopy partitioning affect performance estimations.
Descripción51 Pags.- 4 Tabls.- 12 Figs. The definitive version is available at: https://www.sciencedirect.com/science/journal/03783774
Versión del editorhttps://doi.org/10.1016/j.agwat.2018.03.025
URIhttp://hdl.handle.net/10261/165194
DOIhttps://doi.org/10.1016/j.agwat.2018.03.025
ISSN0378-3774
http://dx.doi.org/10.13039/501100003329
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