The high yields are reached because of those inputs. So without them yields go lower. The lower yields likely have much less of these inputs thus are not impact

The high yields are reached because of those inputs. So without them yields go lower. The lower yields likely have much less of these inputs thus are not impacted as much by them. Compare sustenance or near to highly industrialized farming. The first might use some inputs, but the later will almost certainly use them and in much efficient manner.