Under no circumstances should cold tap water be used to water the melons.
This would seriously impede the growth of the plants. So you use stale, water from a tank or basin, slightly heated during the day. This also applies to the administration of nutrient solutions. It's embarrassing to watch out for, that the earth in the immediate vicinity of the trunk or. of the root collar remains dry, to prevent stem rot from occurring. A useful and common method is to do this, Dig a flower pot to the left and right of the plants up to the edge and pour the irrigation water and nutrient solutions into them. Water sparingly between flowering and fruit setting.