There is nothing that says a farmer can't use sustainable crop rotation practices with fertilizer and pesticide use. In fact, that is what farmers do regularly ... in many places. They aren't idiots that just pump fertilizer and pesticide in their fields to destroy them. If you actually spend some time on a regular commercial farm, you'll find that is the case in this day and age ... even in the US.
Organic food theory is bunk. The double blind taste tests prove, scientifically that your better taste theory is wrong. You know you can grow heirloom varieties and perishable varieties with pesticide and fertilizer too right? Just because people grow perishable and heirloom varieties with organic methods, because rich people like organic, and rich people pay for these lower yielding varieties also, doesn't make these factors inherently confounded. You can separate them if consumer tastes at the top of the market change.
My family grows very delicious fruit and vegetable by using a judicious amount of pesticide and fertilizer, in a sustainable way, in central california. We practice crop rotation in our vegetable gardens (but our primary crop is walnuts which does not allow for crop rotation ... but we are exploring mixed use ... but harvesting constraints and other issues dominate the calculation on whether crop mixing is feasible there).
I am a programmer in San Francisco, and my father would probably have been one in 1970 if such a career was available to him then. He is a really smart guy. You think he is an idiot who doesn't examine all the issues when choosing to use pesticide and fertilizer? Our land has been in our family for almost a century. It is still yielding well. We know very well how to farm sustainably.
Edit: as for subsidies, we don't want them. But we live in a market where prices are determined by them. Subsidies are bad. But, we cannot remove subsidies as individuals. And I disagree that low prices are a result of subsidies in the aggregate. They are certainly for specific crops ... and certainly for meat. But unless you consider water use a subsidy, I don't think food would get 50% more expensive without subsidies. Total US Ag subsidies is around $20 Billion while the size of the Ag sector is like $900Billion. 20 Billion removal will not effect an almost 1 Trillion dollar market in such a drastic way. Specific crops will be more expensive, but on the whole, agriculture will migrate to better, unconventional crops. We will actually meet market demand BETTER once subsidies don't distort our crop choices.