Many Australian farmers who lease their land to electricity companies for use as solar farms run sheep on those same solar farms.

Since the solar panels track the sun, grass grows under them and sheep being small enough to fit under the panels are perfect at keeping that grass under control.

So the farmer actually gets two incomes from the one field.

Really? Such tracking systems do exist, but outside of CSP they are generally not economic. I would be surprised if many PV solar plants in Australia use tracking motors.

Not to say grass won't grow under static panels. I have no idea about that.