It is now five days after the above garden picture was taken, and there has not been much growth in the last week.  After trying week without special watering, I went out to water this PM, and will water twice a day hereafter.  It may be that my new lead-free planting mix with wood organic matter added to sand does not hold enough water to carry the plants to the end of the day.  If this fails to make  a difference, I will check some other things.  Our radishes should be nearly ready to eat by now.