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Evapotranspiration Rate of Lettuce (Lactuca sativa L., Asteraceae) in a Non-Circulating Hydroponics System

Vivencio A. Pelesco, Feliciano B. Alagao

Abstract


This paper analyzed how the evapotranspiration (ETc) of lettuce in a non-circulating hydroponics system correlates with the reference crop evapotranspiration (ETo) and the age of the plant. Regression analysis was carried out to determine the relationship between ETc with the ETo and the age of the plant. Fully developed and mature lettuce plants consumed much water, and the changes in climatic conditions also caused a significant change in water consumption during this stage of growth. The ETc of lettuce in non-circulating hydroponics correlates with the climatic condition and the age of the plant. Water demand for lettuce in non-circulating hydroponics is high at higher reference evapotranspiration and for mature plants.


Keywords


water demand; reference evapotranspiration; climatic condition; vegetable

References


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British Columbia Ministry of Agriculture, Food and Fisheries (2001). Crop Coefficients for Use in Irrigation Scheduling. Water Conservation Factsheet, Retrieved August 15, 2014, from www.agf.gov.bc.ca/resmgmt/publist/500Series/577100-5.pdf.

FAO (1998). Crop Evapotranspiration. Rome: Food and Agriculture Organization.

Gallardo, M., Snyder, R., Schulbach, K., and Jackson, L. (1996). Crop Growth and Water Use Model for Lettuce. Journal of Irrigation and Drainage Engineering, pages 354-359.

Jones, J. and Benton, J. (2005). Hydroponics: A Practical Guide for the Soilless Grower (2nd ed.). Boca Raton, Florida: CRC Press, Inc.

Santos, J. A. and Ocampo, E. T. M. (2009). SNAP Hydroponics. Institute of Plant Breeding, College of Agriculture, U.P. Los Baños, College, Laguna.


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