Red Sails, a reddish loose-leaf variety, has been a dependable lettuce for me in the past. I will be comparing it to a new lettuce, Adriana, a green butterhead variety. Since my 3.5-gallon bucket will hold 3 plants, I will grow 1 Adriana plant and 2 Red Sails.
Dec 2, 2015 = Day 0. Plants started from seed: Adriana (Johnny’s Seeds), Red Sails (Botanical Interests). Moistened with dilute fertilizer: Dyna-Gro Liquid Grow, diluted 1 mL (1/5 tsp) per gallon of tap water. Nutrient concentrations (in ppm): N 18, P 24, K 13, Ca 5, Mg 1, S 0.13, Fe 0.26, Mn 0.13, B 0.05, Zn 0.13, Cu 0.13, Mo 0.002, Ni 0.0003, Co 0.004. pH = 7.0.
Roots are now visible growing out of the bottom of the rockwool cubes, so it is time to install these plants into a larger 3.5-gallon bucket.
Dec 19, 2015 = Day 17. Plants installed in 3.5-gallon bucket. Hydroponic solution composed of 3.5 gal (13.25 L) tap water, 7 g MasterBlend 4-18-38, 7 g calcium nitrate, 3.5 g magnesium sulfate, 0.7 mL Dyna-Gro Pro-TeKt, 2.8 mL pH Down. Nutrient concentrations (in ppm): N 103, P 95, K 202, Ca 100, Mg 29, S 34, Fe 2.1, Mn 1.1, B 1.1, Zn 0.3, Cu 0.3, Mo 0.05, Si 4. pH = 6.5.
I thinned out the plants so that there are now only 2 plants growing out of each net-pot.
Feb 28 = Day 88. The entire Adriana plant has been harvested, only the 2 Red Sails plants remain. The plant stems are getting quite long, but the leaves still taste fine.
Mar 10 = Day 99. Harvested all leaves. Final statistics: 3.2 gallons (12.1 L) of fluid used. Final pH of fluid = 8.0.
Based on my experience, I conclude that Red Sails gives a better yield than the Adriana variety. Both types of lettuce did well, but the Red Sails leaves were bigger and more plentiful than the Adriana.