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

Courses offered this semester at UPRM: Farm Irrigation and Agroclimatology (TMAG)


I will be offering the following two courses this semester at UPR-Mayaguez. Please click the following links for the course fliers.

TMAG 5017 Agroclimatology

TMAG 4019 Farm Drainage and Irrigation Systems

Please feel free to contact me if you would like additional information about either course.

Eric Harmsen, Professor
University of Puerto Rico
Dept. of Agricultural and Biosystems Engineering
Mayaguez, Puerto Rico 00681
email: harmsen1000@hotmail.com, eric.harmsen@upr.edu
phone: 787-955-5102
websites: http://pragwater.com , http://bahai.org

irrigation

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.

Course offerings this semester at UPRM: Farm Irrigation and Agroclimatology (TMAG)


I will be offering the following two courses this semester at UPR-Mayaguez. Please click the following links for the course fliers.

TMAG 5017 Agroclimatology

TMAG 4019 Farm Drainage and Irrigation Systems

Please feel free to contact me if you would like additional information about either course.

Eric Harmsen, Professor
University of Puerto Rico
Dept. of Agricultural and Biosystems Engineering
Mayaguez, Puerto Rico 00681
email: harmsen1000@hotmail.com, eric.harmsen@upr.edu
phone: 787-955-5102
websites: http://pragwater.com , http://bahai.org

irrigation

Why Leaves Evolved


The Glory of Leaves

Click here to read article

leaves
Water Lily:  Like snorkels, the mouthlike stomata on water lily leaves point up, where they find the air they need.
From National Geographic Magazine, October 2012, http://ngm.nationalgeographic.com/2012/10/leaves/dunn-text

This article is very interesting, describing some of the evolutionary processes that created the wide diversity of plant leaves that exist over the surface of the Earth.  It also discusses the process of photosynthesis as a unique mechanism for deriving food directly from the sun.  The article, unfortunately, never once mentioned the extremely important temperature regulation mechanism of evapotranspiration, which is the other important function of the stomata (microscopic pores on the surface of leaves).  The reader may find it interesting that only about 1% of the solar energy received by the leaf is used for photosynthesis.  The other 99% is converted into other energy fluxes for maintaining the leaf temperature within a comfortable range.  When sufficient water is present in the soil, virtually all of the solar radiation is converted into the latent energy flux  (i.e., water vapor), which keeps the plant leaf cool,  the same way perspiration is used to cool humans.  Keeping cool is critically important for plants, to avoid heat stress and a reduction in their growth and yield (e.g., fruit, seed, etc.).

 

NOAA CREST SUMMER CAMP at UPRM


Students from across Puerto Rico attended the NOAA CREST Summer Camp this week on the UPRM Campus.  This afternoon, they attended a workshop by Dr. Eric Harmsen, which focused on the use of GOES-PRWEB for scheduling irrigation in Puerto Rico.  Irrigation scheduling is important for water conservation and for achieving optimal crop yields.  The presentation is provided below:

DOWNLOAD PDF PRESENTATION HERE

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