A Roller Gallery

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Several pictures of cover crop crimper/rollers at this site.
The New Farm - Roller Gallery

(They are used for mechanical kill of cover crops in no-till systems.
Here is an article about Cover Crop Rollers )

They include:

 

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And

 

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Here is a picture of planting soybeans no-till into rolled rye.

Article about planting soybeans into rye cover.