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I guess another option would be to spray the green manure with
glyphosate and let it die off before digging in.

But I wonder if I would loose any beneficial effects if I do that?

Ed[/quote]

By using a weedkiller, you are losing any possible benefit. Cut off the green manure, then dig it in. As with so many "natural" techniques, hard labour is part of the picture. There are rarely short cuts.