Where did indian tribes get their food from

They got a lot of their food by Fishing and Hunting, I am not sure which kind of Indians you are talking about, so i cannot tell you EXACTLY where they got their food from. but they did Fish and Hunt. so that is my answer. I hope this helped. :)

if you are talking about current time the answer is no

if you are talking about when the colonies were developing the answer is yes

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.