Put plastic down.
If you're trying to kill off the weeds but the ground has not been worked yet, put down heavy black/dark polythene sheeting. The weeks will die off underneath it, and the ground underneath will dry out.
If the ground is ready for planting, put down permeable sheets on it. For example, that plastic sheeting that's made out of weaved plastic, like a coal sack. Prevents seeds from landing on the soil and germinating, but keeps the soil moist and ready-to-go.