I believe this is what you seek
see
http://home.us.archive.org/details/onagriculturewit02coluuoft
also
L. Junius Moderatus Columella Of Husbandry: In Twelve Books: and His Book Concerning Trees (Google eBook)
> The inquiry into these and similar questions concerns those who search into the hidden secrets of nature rather than husband- men. They are subjects more agreeable to the students of literature, who can read at their leisure, than to farmers who are busy folk, seeing that they are of no assistance to them in their work or in the increase of their substance. -- Columella
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