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In general, one is required to take t'rumos and maasros from grain only once the pile of grain is been smoothed (מירוח הכרי, meruach hak'ri). (I think other halachos also kick in then.) What exactly is this act of smoothing, and why would a farmer do it?

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What do you do when you finish raking leaves on your lawn? Do you square off the pile a little? Push it together a bit? – Double AA Aug 8 '13 at 18:22

Double AA answered the question already: The obligation for terumos and ma'aseros begins when the harvest ends. The harvest ends when the bales are topped off.

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I do not endorse this answer. – Double AA Aug 8 '13 at 19:27
My question was what miruach hak'ri is, and you seem to be saying it's topping off bales. Can you edit in what that means, how you know it's the meaning of miruach hak'ri, and why a farmer does it? – msh210 Aug 8 '13 at 20:56

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