Hydroponic sweet corn

Here is the hydroponic sweet corn I grew this year in a flood and drain system. The bed is 5 mm (1/4”) gravel, 125mm (5”) deep.
I planted some seed direct into the bed November 21 2020 and some into a seed raising mix. The plants from the seed raising mix I transplanted into the gravel bed.
Initially I was flooding the bed three times a day (every 8 hours). It takes 7 minutes to flood the bed. Then after the plants were growing and the weather was getting hot I upped the flooding to every six hours (4 times a day) then upped to 8 times a day ( every 3 hours).
The sweet corn grew really well and is ready eat at 68 days.