I did a similar experiment last year with the same result. I had seven hundred 3 gallon figs that I was hand watering with a hose 1 time a day, taking about 4 hours to complete watering. I thought what if I put them in trays of water 2 inches deep 1.3 gallons of water per tray. I put half of them in trays and left the other half. Besides saving 2 hours of watering time, their growth exploded, the ones in trays grew 2x faster then the ones not in trays. A few of them grew 2ft in a month!