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Preplant and Postharvest Weed Control: Stale Seedbed and Inter-Row Weeding

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 20 June 2008

Pub 75: Guide to Weed Control > Preplant and Postharvest Weed Control > Stale Seedbed and Inter-Row Weeding

Excerpt from 2008 Chapter 6, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Introduction
  2. Aim EC + Agral 90 or Ag-Surf or + Merge
  3. Glyphosate
  4. Gramoxone or Reglone
  5. Ignite
  6. Preplant and Postharvest Weed Control Tables
    • Non-Selective Herbicides Available for Preplant Site Preparation (Table 6-1) (PDF - 41 kb)
    • Preplant Herbicide Weed Control Ratings (Table 6-2) (PDF - 39 kb)
    • Postharvest Weed Control (Table 6-3) (PDF - 38 kb)
  7. Other Special Methods of Weed Control
  8. Related Links

 

Introduction

The stale seedbed technique is useful when the soil can be worked well before planting, and weeds are allowed to emerge for several weeks. Apply one of the non-selective postemergent herbicides listed here to kill emerged weeds. Seeding or planting directly into the killed weeds with minimal soil disturbance will allow the crop to establish before the next flush of weed emergence. Follow up with either cultivation, hoeing or postemergent or directed herbicides to control later germinating weeds. Where registered, some herbicides can be applied after seeding but before crop emergence.

Aim EC + Agral 90 or Ag-Surf or + Merge

Trade Name
or + Merge
Active Ingredient
carfentrazone-ethyl
+ non-ionic surfactant
or + surfactant/solvent
Formulation
240 g/L
 
 
Rate per hectare (active)
17.5 to 35 g/ha
0.25 % v/v
0.1 % v/v
Rate per hectare (product)
37 to 117 mL/ha
2.5 L/1000 L
1 L/1000 L
Rate per acre (product)
5 to 47 mL/ac
2.5 L/1000L
1 L/1000 L

Precautions

  • Apply POST with a HOODED SPRAYER between the rows or between the plastic mulch.
  • Apply to actively growing weed up to 10 cm tall.
  • Apply in a minimum of 100 L/ha (40 L/ac) water.
  • Apply ONLY once per growing season
  • AIM EC may cause crop injury if the spray is allowed to come in contact with the green stem, leaves, bloom or fruit.
  • Pre-Harvest Interval (PHI) ranges from 1 to 15 days depending on the crop. Refer to the product label for a specific crop's PHI.
  • Refer to product label or Chapter 4, Notes on Herbicides, for a list of registered crop uses.
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Glyphosate
Trade Name
Active Ingredient
glyphosate
or glyphosate
or glyphosate
or glyphosate
Formulation
360 g/L
480 g/L
500 g/L
540 g/L
Rate per hectare (active)
0.27 to 1.26 kg/ha
0.27 to 1.26 kg/ha
0.27 to 1.26 kg/ha
0.27 to 1.26 kg/ha
Rate per hectare (product)
0.75 to 3.5 L/ha
0.56 to 2.63 L/ha
0.54 to 2.63 L/ha
0.5 to 2.3 L/ha
Rate per acre (product)
0.3 to 1.4 L/ac
0.22 to 1.05 L/ac
0.22 to 10 L/ac
0.2 to 0.93 L/ac

Precautions

  • Till and fertilize soil in early spring.
  • Allow weeds to grow, and spray weeds just before seeding crop.
  • Use low rate for small weeds (8 cm), medium rates for weeds 8 to 15 cm and higher rate for weeds over 15 cm tall.
  • Apply recommended herbicides to control new flushes of weeds or use mechanical means of control.

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Gramoxone or Reglone
Trade Name

or Reglone
Active Ingredient
paraquat
or diquat
Formulation
200 g/L
200 g/L
Rate per hectare (active)
0.6 to 1.1 kg/ha
0.6 to 1.1 kg/ha
Rate per hectare (product)
3 to 5.5 L/ha
3 to 5.5 L/ha
Rate per acre (product)
1.2 to 2.2 L/ac
1.2 to 2.2 L/ac

Precautions

  • For emerged weeds after the crop seed is sown, but before crop emergence.
  • For use ONLY in beans (all types), beets, carrots, cole crops, corn, onions, peas, cucumbers, potatoes, soybeans and turnips.
  • In inter-row weeding, special low pressure equipment is used to apply the herbicide on emerged weeds without contact with leaves of the crop plants.
  • For small areas, apply 30 mL product in 10 L water per 100 m2.

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Ignite
Trade Name
Active Ingredient glufosinate ammonium
Formulation 150 g/L
Rate per hectare (active) 0.405 to 0.75 kg/ha
Rate per hectare (product) 2.7 to 5 L/ha
Rate per acre (product) 1.08 to 2 L/ac

Precautions

  • For use ONLY in carrot, lettuce and onion crops.
  • Apply in a minimum of 110-330 L/ha (44-132 L/ac) of water.
  • Apply after seeding, but prior to emergence of the crop.
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Related Links

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