SciELO - Scientific Electronic Library Online

 
vol.69 issue1Continuous Stabilization of Chardonnay with Ion-Exchage Resin: Influence on Protein and Phenolic Profile of WinePreference of Quinoa Moth: Eurysacca Melanocampta Meyrick (Lepidoptera: Gelechiidae) for Two Varieties of Quinoa (Chenopodium quinoa Willd.) in Olfactometry Assays author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Chilean journal of agricultural research

On-line version ISSN 0718-5839

Abstract

CASANOVA P, Manuel; MESSING, Ingmar; JOEL, Abraham  and  CANETE M, Alberto. Methods to Estimate Lettuce Evapotranspiration in Greenhouse Conditions in the Central Zone of Chile. Chilean J. Agric. Res. [online]. 2009, vol.69, n.1, pp.60-70. ISSN 0718-5839.  http://dx.doi.org/10.4067/S0718-58392009000100008.

This study evaluates five methods to estimate crop evapotranspiration in greenhouse conditions. It compares their performance in relation to the evapotranspiration directly determined from water balance measurements (ETlys) in an irrigated lettuce (Lactuca sativa L.) crop during 9 weeks. Daily values of the reference evapotranspiration (ETo) from Class A pan (CAP), Piche atmometers (ATM), Andersson evaporimeters (ANE), FAO-Radiation (FRE) and FAO-Penman-Monteith (PME) equations were compared. The methods showed similar temporal variations but at different ranges as follows: ANE < CAP < FRE < PME < ATM. Furthemore, ETo had a clear correlation with solar radiation. Crop coefficients (Kc = ETlys/ETo) varied somewhat amongst the methods, but trends were identified for two periods: in the first week, the overall mean Kc was 0.3 (± 0.1) and in weeks 2 to 9 on average 0.6 (± 0.3). The greenhouse values of Kc were lower than those generally adopted for lettuce in field conditions. In terms of irrigation design, crop evapotranspiration can be estimated by the methods in this study, on the condition that the appropriate crop coefficients are applied. The fact that ANE showed values closest to those of ETlys, along with cost and management convenience, makes it an advantageous alternative as compared to the other methods.

Keywords : evapotranspiration; greenhouse; lettuce; lysimeter.

        · abstract in Spanish     · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License