Demonstration of Herbicides for Weed Control in Onions (2011-2012) - 5 apges
This project demonstrated the efficacy and crop safety of a range of herbicides for use in yellow onion production.
Thorough, consistent weed control is essential for successful onion production. Onions remain sensitive to weed competition for the entire growing season. Presently weed control in onions is achieved through mechanical tillage and/or application of herbicides. Herbicides have several potential advantages over tillage for controlling weeds in onions. Well-timed application of an appropriate herbicide can provide long-lasting weed control - including the weeds growing within the row. Chemical weed control may also be achieved at a lower overall cost than repeated tillage operations – especially if hand weeding is required to deal with weeds within the rows that are typically missed by standard between-row tillage.
Trials were conducted in 2011 and 2012 at the University of Saskatchewan Horticulture Field Research Facility in Saskatoon. This site has been in the long term production of horticultural crops and has a “typical” spectrum of broadleaf weeds seen in vegetable fields. Grassy weeds are uncommon. Both fields used in the trials were in summer fallow the previous year. Summer fallowing is a common practice in land designated for onion production – as it reduces the weed pressure.
The products tested, the rates applied and the recommended crop stage for treatment were;
Trmt 1- Chateau (51 WDG) (flumioxazin) @ 28-56 g/a. Apply at 4-6 leaf stage
Trmt 2 - Goal (4SC) (oxyfluorfen) @ 230 ml/a. Apply after 2 leaf stage
Trmt 3 - Buctril (bromoxynil) @ 94-236 ml/a. Apply at 2-5 leaf stage
Trmt 4 - Dual Magnum (7.6E) (metolachlor) @ 330-615 ml/a. Apply after 2 leaf stage
Trmt 5 - Prowl (3.8 ACS) (pendimethalin) @ 340-950 ml/a. Apply after 2 leaf stage
