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Corn gluten meal:An Organic Pre-Emergent Herbicide (2)

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  • Time of issue:2021-07-01
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(Summary description)

Corn gluten meal:An Organic Pre-Emergent Herbicide (2)

(Summary description)

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2021-07-0115
  • Views:
Information

How Much Is Corn gluten meal Needed?

Application rates vary by form: powder, pelletized or granulated. The standard application rate is 20 pounds of corn gluten per 1,000 square feet of lawn. This rate also provides about 2 pounds of nitrogen per 1,000 square feet.

 

The effects of corn gluten are cumulative, meaning that the results improve with repeated use over time.

 

The Downside

Some experts are critical of using corn gluten as a pre-emergent crab-grass killer, pointing to several points:

 

Corn gluten meal is costlier than conventional pre-emergent herbicides. Because multiple applications are often required, you could be handling hundreds or even thousands of pounds of the product, depending on the size of the yard. Sprayable, liquid forms of corn gluten can make applications easier, but they are still costly.

Timing is critical for both organic and synthetic chemical pre-emergents. It's very important to remember that all pre-emergents, including corn gluten, will suppress all seeds, including grass and flower seeds. If you are using non-selective pre-emergents in the spring and summer, any lawn seeding should be done in the fall.

What Are Synthetic Chemical Pre-Emergents?

A synthetic chemical pre-emergent is a non-organic herbicide that is applied to the landscape prior to weeds and other unwanted plants growing. In essence, it prevents those plants from emerging from the soil where seeds might lie.  

 

The nitrogen in corn gluten has drawbacks. Some turf specialists argue that extra nitrogen only gives weeds the advantage.

Encouraging new grass is more effective. Crabgrass is a filler weed that thrives in bare spots or areas with thin turf grass, and organic turf specialists contend that seeding with new grass is just as effective as applying pre-emergent herbicides such as corn gluten. Dense, healthy turf will naturally crowd out crabgrass, so growing more grass and filling in those thin areas and bare patches may be a better solution.

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