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Thumb of Michigan | Depending on several factors including soil type.
Here's what I do on samdy loam (CEC 6-10).
Take first cutting off by first couple days of June, kill (RU) around the 15th of June. Spend the next month or so leveling ground hog holes/dens. Re-spray RU, first week of August. No-till at ~9# of actual seed per pass (I plant twice, in to different directions). Total seed per acre ~18# of actual seed.
This my method that I've been doing for over 25 years.
I'll try attaching MSU's autotoxicity spreadsheet.
Attachments
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 Alfalfa-autotoxicity-risk-spreadsheet.xls (32KB - 73 downloads)
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Alfalfa autoxicity
