Daily Evapotranspiration Prediction from Louisiana Flooded Rice Field

During 1995, daily evapotranspiration (Et) from a flooded rice field was calculated with a water balance equation using measured values of water level, precipitation, irrigation, seepage, and tailwater runoff. Stagewise Et was 6.3, 8.1, and 6.8 mm d for the vegetative, flowering, and yield formation...

Full description

Saved in:
Bibliographic Details
Published inJournal of irrigation and drainage engineering Vol. 126; no. 1; pp. 8 - 13
Main Authors Shah, S. B, Edling, R. J
Format Journal Article
LanguageEnglish
Published Reston, VA American Society of Civil Engineers 01.01.2000
Subjects
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agricultural and forest meteorology
Agronomy. Soil science and plant productions
Biological and medical sciences
Crops
Evapotranspiration
Flood irrigation
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Grains
Louisiana
TECHNICAL PAPERS
Water balance
Water balance and requirements. Evapotranspiration
Louisiana
United States
North America
America
Subtropical zone
Monocotyledones
Water balance
Forecast model
Cereal crop
Penman formula
Oryza sativa
Gramineae
Angiospermae
Evapotranspiration
Flooded soil
Spermatophyta
Paddy field
Field study
Online AccessGet full text

Cover

More Information
Summary:During 1995, daily evapotranspiration (Et) from a flooded rice field was calculated with a water balance equation using measured values of water level, precipitation, irrigation, seepage, and tailwater runoff. Stagewise Et was 6.3, 8.1, and 6.8 mm d for the vegetative, flowering, and yield formation stages, respectively; average daily Et was 6.8 mm d. Grass reference Et (Etr) combination models Penman-Monteith, FAO-Penman, and 1963 Penman were evaluated for their capabilities to predict rice Et using daily weather data. Daily Etr was also calculated by summing up hourly values with the Penman-Monteith method. The Penman-Monteith (daily) method had a coefficient of determination (R2) of 63.7%, as compared with 62.9, 60.0, and 61.7% for Penman-Monteith (hourly), FAO-Penman, and 1963 Penman methods, respectively. Crop coefficients (Kc) using the Penman-Monteith (daily) model were 1.39, 1.51, and 1.43 for the vegetative, flowering, and yield formation stages, respectively. Developed Kc values were verified using limited rice Et data in 1996. The Kc values underpredicted rice Et by 3.7%, which was acceptable for water management.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0733-9437
1943-4774
DOI:10.1061/(ASCE)0733-9437(2000)126:1(8)