>I agree that in 2015, there should be a solution in making a farmland productive without even to burn it

We may be discussing slightly different points here. In Australia, we control bush land (including farm land) by controlled burning.

It releases nutrients back to the soil. It stops build up of plant matter which can become dangerous and cause extreme bushfires.

I am not aware of a better solution than controlled burning that is cost effective. I was told that it's like several smaller natural bush fires than 1 big uncontrollable fire, so the environmental impact (eg. Smoke) is not increased. However seed pods of wildlife are preserved in smaller fires but destroyed in bigger fires.