This Wolfram-Alpha widget calculates the surface runoff (mm) based on the value of precipitation (mm) and the Natural Resource Conservation (NRCS) Curve Number (CN). More information on the methodology can be obtained from the following reference: Fangmeier, D. D., W. J. Elliot, S. R. Workman, R. L. Huffman, and G. O. Schwab, 2005. Soil and Water Conservation Engineering, Fifth Edition. pp. 528. Values of CN for various land covers, soils and antecedent moisture conditions are available in the NRCS Pond Construction Handbook. Click here to download
Note to user: Sorry about all the digits to the right of the decimal point. I couldn’t find a way to control this when creating the widget.
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) 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.
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
Small Scale Farming: Simple, Successful, Sustainable
Sugeno-san is a philosopher. His love affair with the land is poetry. “These trees are planted by our ancestors. These ‘tambos’ — the orderly descending terraces of rice paddy fields — are blessings from our communal mountains and forests. We smallholder farmers are the guardians of this Earth. It is our ancestral connection with their spirits. We pay our respects by respecting the land.” I realise that this deep and profound link between our planet and our humanity is being shattered by our human greed and ever-rising consumption. Read more…
Cool!! Remotely accessible sensor for managing irrigation and other stuff. The device is sold by a Switzerland-based company called Koubachi. Too expensive for house plants but could be great for agricultural applications. http://allthingsd.com/20130613/high-tech-help-for-the-green-thumb-challenged/.
The review focuses on the remote (mobile) accessibility of the device, which is amazing, but doesn’t talk at all about how accurate the internal sensors are. If anyone has this information please leave a comment. I also will try to check on this.
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I thought the visitors to pragwater.com would find this link on drip irrigation tips useful.
PRAGWATER 
