{"id":24243,"date":"2025-08-21T17:38:23","date_gmt":"2025-08-21T17:38:23","guid":{"rendered":"https:\/\/prograin.ca\/ca\/?p=24243"},"modified":"2025-08-21T17:38:24","modified_gmt":"2025-08-21T17:38:24","slug":"pre-harvest-herbicide-use-in-soybeans","status":"publish","type":"post","link":"https:\/\/prograin.ca\/ca\/en\/2025\/08\/21\/pre-harvest-herbicide-use-in-soybeans\/","title":{"rendered":"Pre-Harvest Herbicide use in Soybeans"},"content":{"rendered":"\n

Pre-harvest herbicide use can contribute to a better harvest. It can also help soybeans achieve food grade when the fields have a certain weed density that could potentially stain the soybeans and in turn affect its grading for human consumption.<\/p>\n\n\n\n

The effectiveness of this solution is determined by: (1) the choice of the right herbicide for the targeted type of weeds, (2) when the product is applied.<\/p>\n\n\n\n

Pre-harvest herbicide use in soybeans<\/h2>\n\n\n\n

Pre-harvest<\/a> herbicide use in soybeans will accelerate the time until harvest by 3 to 10 days as the products will kill the green tissues of the soybean plants (leaves, stems and pods) and the weeds without desiccating the beans.<\/p>\n\n\n\n

This technique generally improves the harvest quality as it: (1) makes the harvest time after spraying more predictable, (2) dries out the weeds, which facilitates the work of the combine harvester and the possible cleanup of perennial weeds in the fields.<\/p>\n\n\n\n

Pre-harvest herbicides to use on soybeans<\/h2>\n\n\n\n

Glyphosate is the herbicide of choice when targeting perennial weeds. Applying glyphosate in the fall helps the active ingredient translocate to the roots. This makes it possible to fight certain weeds more easily, including Canada thistle, Perennial sow-thistle and field bindweed, to name only a few.<\/p>\n\n\n\n

Glyphosate is also recommended for targeting annual weeds. However, since it is slower-acting that other products, it is suggested to use one of the following fast-action herbicides instead:<\/p>\n\n\n\n

  1. Carfentrazone (Aim EC)<\/li>
  2. Saflufenacil (Eragon)<\/li>
  3. Diquat (Reglone)<\/li><\/ol>\n\n\n\n

    Tip: don\u2019t mix glyphosate with a fast-action herbicide if targeting perennial weeds. <\/p>\n\n\n\n

    When to apply pre-harvest herbicide for soybean crops<\/h2>\n\n\n\n

    Once the soybean seed has detached from the pod, the bean is considered mature and the field can be sprayed. To check their maturity, randomly pick some pods from the upper level of the soybean plant and split them open. If the skin separates from the seed, they\u2019re ready!<\/p>\n\n\n\n

    Here are four other ways to determine if it\u2019s time to apply a pre-harvest herbicide:<\/p>\n\n\n\n