soil moisture content Is different for each soil. However, it is considered to have a moderate amount.for example follow this Note:
(( Most damage in the field occurs during harvesting on the harvester. For more information on bruise prevention see guidelines on the "Handling of potatoes to reduce bruising". Timing of operations is critical in managing for a healthy damage-free potato crop. Tillage affects harvest bruising primarily by influencing clod formation. Clods are a significant source of bruising during harvest. All field operations should be managed to minimize soil compaction and clod formation. Potatoes intended for long-term storage should not be harvested until the vines have been dead for at least 10-14 days to allow for skin set. Soil moisture and temperature must be monitored closely. Optimal soil conditions are 60-65% available soil water and a tuber temperature of 10-18ºC.))