PRAGWATER now providing daily reference evapotranspiration for Cuba


Daily reference evapotranspiration (ETo) is now available for Cuba at the following link: Northern Caribbean ETo.  The link also includes ETo data for Puerto Rico, the US Virgin Islands, Hispaniola and Jamaica.

Yesterday’s Reference Evapotranspiration

CUBA

Click for archived maps of reference evapotranspiration and  other climate variables.

 

The following links will provide guidance on scheduling irrigation using the ETo map data.

Harmsen E.W., 2012.  TECHNICAL NOTE: A Simple Web-Based Method for Scheduling Irrigation in Puerto Rico.  J. Agric. Univ. P.R. 96 (3-4) 2012.

A simple irrigation scheduling tool for using ETo maps

PRAGWATER now providing daily reference evapotranspiration for St. Thomas, USVI


Daily reference evapotranspiration (ETo) is now available for St. Thomas (USVI) at the following link: Northern Caribbean ETo.  The link also includes ETo data for Puerto Rico, St. Croix (USVI), Hispaniola and Jamaica.

Yesterday’s Reference Evapotranspiration

St. Thomas, USVI

The following links will provide guidance on scheduling irrigation using the ETo map data.

Harmsen E.W., 2012.  TECHNICAL NOTE: A Simple Web-Based Method for Scheduling Irrigation in Puerto Rico.  J. Agric. Univ. P.R. 96 (3-4) 2012.

A simple irrigation scheduling tool for using ETo maps

Daily Reference Evapotranspiration (ETo) for Haiti and the Dominican Republic


Daily reference evapotranspiration (ETo) is now available for Haiti and the Dominican Republic.  CLICK HERE to visit the new pragwater page, which provides a link to the daily image data and the method background information.  The page also provides information related to the practical application of the results for scheduling irrigation in Haiti and the Dominican Republic.

reference_ET_PenmanMonteith20130729

ACKNOWLEDGEMENTS: This research received partial funding from the following sources: NOAA-CREST (grant NA06OAR4810162) and USDA Hatch Project (Hatch-402). Special thanks to Dr. John Mecikalski for providing the solar radiation data, and Alejandra Rojas for providing various GIS maps used in this research. I would like to thank my student, Victor Reventos, who made this possible through his Python programming skills.

DISCLAIMER: The information is provided “as is”. The authors and publishers of this information disclaim any loss or liability, either directly or indirectly as a consequence of applying the information provided herein, or in regard to the use and application of said information. No guarantee is given, either expressed or implied, in regard to the accuracy, or acceptability of the information.

CROP WATER USE ( HARGREAVES ET EQUATION) WOLFRAM ALPHA WIDGET


CROP WATER USE ( HARGREAVES ET EQUATION) NEW WOLFRAM ALPHA WIDGET. Reference: Hargreaves, G. H. and Z. A. Samani, Reference Crop Evapotranspiration from Temperature. Appl. Eng. Agric., ASAE. 1(2). 1985,. pp.96-99.

Widget Application: Suppose you want to schedule irrigation by replacing the water evapotranspired by your crop each day.  1. Click on the appropriate link to get yesterdays solar radiation for your location: Puerto Rico or Northern Caribbean, 2. Check the internet for the average daily air temperature at your location (average = (minimum + maximum)/2),  3. Get the appropriate crop coefficient for your crop from this link, and 4. Finally, enter solar radiation, air temperature and crop coefficient into the widget to estimate ET. Multiply ET x acres x 1069.0663 to get the number of gallons of water you need to apply to your field.