Potassium should be placed away from the seed. Sulphur deficiency may occur in many other soils and in any area of the province. Because of this, a soil test is recommended to determine the available sulphur status of your fields. Manitoba's Soil Fertility Guide Weed Control Soybean seedlings are non-competitive. Weed management is primarily by herbicide.
Cultivation is possible if soybeans are grown as a row crop.
In this case, herbicides can be applied in a band over the row. See Manitoba Agriculture's Guide to Crop Protection and Field Scouting Guide for information on currently registered herbicides and weed management in soybeans. Under most conditions, moderate defoliation early in the season has no appreciable effect on soybean yield. Fifty per cent defoliation before flowering results in an average yield loss of only three per cent. As the soybean plant reaches the flowering and pod-filling stage, defoliation is a greater threat to yield and controls may be needed.