I have no idea what you mean by "bulk of land..", so I can not comment on that<quoted text>
Yes you farm in Arid land like Israel and leave the "bulk of land" to be taken over by weeds and thorns.
I thought that you are supposed to be the "genius" on this thread.
But may be it is for Hugh Be and Joel and the gang.
But my point is that if you ONLY introduce the nutrients needed to grow your crop, in the proper amounts and ratios, then you really shouldnt be feeding the weeds. Basic 20th or 21th century agriculture.