Volume 39, Number 7 | MARCH 11, 2013
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PRACTICAL PRODUCTION TIPS FOR THE PRAIRIE FARMER
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Adding adjuvants to chemicals There are more and more adjuvants available to Prairie farmers. Find out what they are and what they can offer you BY ANGELA LOVELL
A
n adjuvant is a product that is added to a spray mixture to change its physical or chemical characteristics. “Adjuvants are designed to maximize a crop protection product’s ability to function by minimizing the constraints in a pesticide application process,” says Dale Ziprick, product manager with UAP. There are several different adjuvants and they have many different purposes, but they basically fall under two categories as defined by Canada’s Pest Management Regulatory Agency (PMRA). Activators are the first category. Activators, such as surfactants and crop oils, are designed to enhance the activity of pesticides, for example to improve coverage and increase plant uptake. The second category, utility modifiers, change the function and physical characteristics of the chemical. This would be done, for example, to reduce foaming, increase solubility, modify pH or reduce spray drift. Some adjuvants are built into the chemical formulation, so they come in the jug. But sometimes, for vari-
Whether they’re built into the chemicals you buy, or you mix them yourself on the farm, adjuvants can make a big difference. ous reasons, the adjuvant cannot be built in and must be added by the farmer or spray applicator according to the label specifications. When mixing adjuvants into products on the farm, farmers should follow those label instructions carefully and make sure they add the right amount, says
Tom Wolf, a research scientist with Agriculture and Agri-Food Canada at Saskatoon “Most adjuvants work on the basis of a concentration. If you don’t add the correct rate it won’t work. Adjuvants are also product specific. There isn’t a universal adjuvant that helps all pesticides.”
SURFACTANTS Surfactants are the most common type of adjuvant. They’re used to improve performance, particularly of herbicides, in a variety of ways. They can ensure better coverage by increasing spreading on the leaf surfaces, improving
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adhesion properties and enhancing plant uptake. Adding a surfactant to a herbicide formulation reduces the surface tension of the water and also improves its ability to mix with oily substances. This allows the herbicide to more effectively
» CONTINUED ON PAGE 4
Wheat & Chaff ..................
2
Features ............................
5
Crop Advisor’s Casebook
10
Columns ........................... 27 Machinery & Shop ............ 32 Cattleman’s Corner .......... 38
Liquid fertilizer and melting urea
PATRICK FABIAN PAGE 8
Reinventing the combine
FarmLife ............................ 43
SCOTT GARVEY PAGE 34
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