I really don't wish to embarrass you, but had you gone to the link and read what is there, you'd not have left the comment that you left.
The purpose of the Shemita as explained at C_O's link is NOT to give the land a break, it's ultimately to teach by long tradition of planning and experience how to withstand siege and to provide the knowledge of the terrain from which to fight back.
As is the nature of short explanations, you'd be foolish to think that that is all there is to it. Go to the link and you will see why hydroponics does nothing to solve the problem that is addressed by either C_O or Kartographer.
I’m quite aware of the thesis presented in Shemita.
I still have the pre-release copy I reviewed for C_O.
I simply do not share his appreciation for the Mormon, and other, tribal collectivism implicit in the proposed “solution”.
Preferring instead a Reformation of American Ideals, where the purpose of governance is to secure the inalienable rights of the Individual, rather than subjugating them via tribal theocratic Shock and Awe.