✹ About 16, 17, 18, 19 July 1661 Gerald Berg on 21 Jul 2014 • Link I have trouble seeing anyone signifying hay solely by the word 'crop'. Rather 'hay' or 'hay crop'. Too early to be harvesting much else. However, there could be grain stored in silo. Hence "upon the ground" (to me) would be the present ripening field crop being let out. If one doesn't wish to spend the remaining growing season tending to the crop, letting out would be optimal.