Garfield County Cooperative Extension

Winter Canola Field Tours

Rick Nelson Extension Educator, Ag/4-H

Canola producers are invited to any one of the three following locations in Northwest Oklahoma:   

Grant County- South of Medford (36.75,-97.72), from Pond Creek head east on Highway 60 for two miles.  Turn left on 960 road, head north for 5 miles.  Turn left on Greer Road.  Trials are located on the north side of the road approximately ¼ mile. This tour begin at 9:00am on Tuesday, April 10th.

Woods County- East of Dacoma (36.65, -98.48), from Dacoma head south on Comanche Ave.  Turn left on Craig Rd, head east on Craig, plots will be on the south side of the road prior to reaching N2550Rd.  From Carmen, head north out of town on N. Grand Ave, which will turn into N2550 Rd.  On N2550 Rd. travel north for 4 miles.  Turn left on Craig Rd, head west on Craig Rd., plots will be on the south side of the road prior to reaching the city of Dacoma. This tour will begin at 2:00 pm on Tuesday, April 10th.

Major/Garfield County- West of Lahoma (36.39, -98.11) The North Central Research Station is located just one mile west of Lahoma.  You can enter at the cross-over (Road N2750 Rd).  If you take the first major road into the station, continue west until it curves south.  Continue south of this road until it turns back to the east.  The plots will be located just past the curve to the east. The final tour for the district will be held Thursday, April 12th.

The following OSU Extension Specialists tentatively will be on hand to discuss canola agronomic issues, pest management, fertility, and harvest options:

Josh Lofton, OSU Cropping Systems Specialist

Brian Arnall, OSU Precision Nutrient Management Specialist

Misha Manuchehri, OSU Extension Weed Scientist

Josh Bushong, OSU Northwest Area Agronomist

Tom Royer, OSU IPM Specialist and Field Crops Entomologist

John Damicone, OSU Plant Pathologist

Jason Warren, OSU Soil and Water Conservation Specialist

Heath Sanders, OSU Southwest Area Agronomist

Ron Sholar, Oklahoma Oilseed Commission Executive Director

How efficiently can winter wheat use available water?

In regions where yield is limited by water, water is generally used more efficiently and yield potential can be calculated using a water-use efficiency coefficient. This is true for regions where growing season precipitation is generally less than about 15 inches, and precipitation distribution plays a very important role in determining the crop’s water-use efficiency.

Previous studies performed in the Southern Plains and other water-limited regions of the world, such as Australia, have shown that wheat can yield as much as 8.3 bu/acre for every additional inch of precipitation in the growing season when water is used most efficiently. This very effective use of water occurs only when precipitation is very timely and falls during critical periods for grain yield determination - such as stand establishment and tillering, spring green up, and grain filling.

Although 8.3 bu/acre/inch is the potential transpiration efficiency of wheat, this extremely high water-use efficiency value only occurs when all conditions (management- and weather-related) lead to increased grain yields. This is very seldom observed under field conditions. For instance, any limitation due to management, such as disease or pest incidence, nutrient deficiency, or weed pressure, will decrease the efficiency with which wheat uses the available water. Likewise, heat stress during later stages of grain filling will result in shriveled grains and will reduce the crop’s water use efficiency.

As a consequence, wheat water-use efficiency values in the 3 to 5 bu/acre/inch are more often observed under field conditions. A study looking at 11 site-years in central Oklahoma resulted in water-use efficiency ranging from 2.9 to 4.8 bu/acre/inch, meaning that an average water-use efficiency of about 4 bu/acre/inch may be a fair number to use for wheat.

Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Oklahoma Cooperative Extension Service is implied.


Oklahoma State University, U. S. Department of Agriculture, State and Local governments cooperating.  Oklahoma State University in compliance with Title VI and VII of the Civil Rights Act of 1964, Executive Order 11246 as amended, Title IX of the Education Amendments of 1972, Americans with Disabilities Act of 1990, and other federal and state laws and regulations, does not discriminate on the basis of race, color, national origin, gender, age, religion, disability, or status as a veteran in any of its policies, practices, or procedures."


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