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Instructions: To determine amount to irrigate; add daily ET for each day since your
last irrigation or significant rainfall…..(look below table for more info).
Growing Degree-days for small grains(32d) planted Apr 10							582	vs.30 yr Avg =		619	94.1%	% Avg
Growing Degree-days for potatoes (45 d) planted May 5 =							108	vs.30 yr Avg =		93	116.6%	% Avg
Estimated Crop Water Use (ET)
Weather Data from SLV Research Center Extension Office
		Daily Crop Water use for				Accumulated Water Use (ET)
	Date	Dates Shown (inches/day)				From Latest Day Shown
Crop	Planted	05/23	05/22	05/21	05/20	2day	3day	4day	5day	7day
Moravian 69	04/05	0.24	0.24	0.19	0.17	0.47	0.66	0.83	0.99	1.36
Moravian 69	04/20	0.16	0.15	0.12	0.10	0.31	0.43	0.53	0.62	0.83
Moravian 69	05/05	0.10	0.09	0.07	0.05	0.19	0.25	0.31	0.36	0.46

Early Wheat	04/05	0.24	0.24	0.19	0.17	0.47	0.66	0.83	0.99	1.36
Early Wheat	04/20	0.15	0.15	0.11	0.10	0.30	0.42	0.51	0.60	0.80
Early Wheat	05/05	0.09	0.08	0.06	0.05	0.17	0.23	0.28	0.32	0.44

White Wheat	04/05	0.24	0.24	0.19	0.17	0.47	0.66	0.83	0.99	1.36
White Wheat	04/20	0.15	0.15	0.11	0.10	0.30	0.42	0.51	0.60	0.80
White Wheat	05/05	0.09	0.08	0.06	0.05	0.17	0.23	0.28	0.32	0.44

Winter Wheat	10/01	0.24	0.24	0.19	0.17	0.47	0.66	0.83	1.00	1.39

Norkotah Potato	04/25	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.19	0.27
Norkotah Potato	05/05	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.19	0.27
Centennial Potato	05/05	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.19	0.27
Nugget Potato	04/25	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.19	0.27
Nugget Potato	05/05	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.19	0.27

Alfalfa	Estab.	0.27	0.27	0.22	0.19	0.54	0.76	0.95	1.14	1.59
Canola Early	05/05	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.19	0.27
Canola Late	05/20	0.04	0.05	0.04	0.03	0.09	0.13	0.16	0.16	0.16
Lawngrass	Estab.	0.22	0.23	0.18	0.16	0.45	0.63	0.79	0.95	1.33

For the latest recorded message, call 754-3494 extension 40 (Center), Ext 38 for LaJara and Ext 36
for Center #2. Use the crop maturity and planting date closest to your own. The Internet address is:
http://www.slvet.colostate.edu			This information provided by Andrew Houser & Robert Davidson,
SLV Research Ctr	Colorado State University. For information on using the data,
call 754-3496 x26 or e-mail:			ahouser@lamar.colostate.edu

Note: Weather stations used for ET calculations are located at
Center (SLV Research Center), Center02 (7 mi NE of Center),
Blanca and La Jara. Use the weather station closest to the field for which you want the ET (crop water use).


Instructions: To determine amount to irrigate; add daily ET for each day since your
last irrigation or significant rainfall..
Instructions: Add daily evapotranspiration (ET) for each day since your last irrigation.
This is the amount of water the crop has used. This amount plus 10-20% for efficiency must be added.
Totals for two, three, four, five, and 7-days are added for you.
Rainfall is not included. Subtract effective rainfall for each individual field. What is presented is
the net amount of irrigation needed. Add 10 to 20% for irrigation inefficiency. You might add 20% for high
pressure overhead sprinklers and add at least 10% for low pressure drop nozzles. In the early season, do
not irrigate until the amount needed is at least 0.50 inches unless you are trying to keep the surface wet for
emergence. Irrigating with small amounts wastes water as most of the water is lost to soil evaporation.

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