Most of the literature that is available about the subject of ‘sustainable agriculture’ tends to make the whole issue look very complicated. As a consequence, many people are dissuaded from adopting sustainable agriculture practices: thanks to the feeling that it is too complicated. The truth of the matter, however, is that sustainable agriculture is actually quite simple.
To the extent that you can stop using herbicides in your farm, you will, in my opinion, have done more than 30% of what sustainable agriculture is all about. You can get rid of weeds organically, thus doing away with the need for herbicides.
Further, to the extent that you can stop using pesticides in your farm, you will, in my opinion, have done more than (another) 30% of what sustainable agriculture is all about. You can use organic methods to get rid of pests.
Further still, to the extent that you can stop using chemical fertilizers in your farm — and instead use organic manure and other such alternatives — you would have, in my opinion, done more than (yet another) 40% of what sustainable agriculture is all about.
There are, of course, other advanced practices in sustainable agriculture: like those of desisting from tilling the land, those of protecting the land from erosion and those of desisting from using GMO seeds. In the final analysis though, we do get the impression that sustainable agriculture need not be a complex subject.