Lettuce – Red Sails, Rouge Grenobloise

greens-lettuce-rouge-grenobloise-img_0312-002Rouge Grenobloise is a Batavian (crisphead) type of lettuce from France.  I will be comparing this lettuce to Red Sails, one of my favorites.

Mar 10, 2016 = Day 0.  Plants started from seed (Botanical Interests, Bountiful Gardens).  Seeds sowed in 1.5-inch rockwool cube in 2-inch net-pot.  Moistened with dilute fertilizer solution: 1.2 mL Dyna-Gro Liquid Grow, 0.8 mL pH Down per gallon of tap water.  Nutrient concentrations (in ppm):  N 22, P 29, K 16, Ca 6, Mg 1.6, S 0.2, Fe 0.3, Mn 0.2, B 0.1, Zn 0.2, Cu 0.2, Mo 0.003, Ni 0.0003, Co 0.005.  pH = 6.0.

Mar 12 = Day 2.  Plant germinated, placed directly under a fluorescent light (2 ft. T8 bulb, 17W, 6500k) for 16 hours per day.

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Mar 19 = Day 9.  Red Sails (left), Rouge Grenobloise (right)

Mar 22 = Day 12.  Installed plants into 3.5-gallon bucket.  Hydroponic solution composed of 3.5 gal (13.2 L) tap water, 53 mL 250x Masterblend 4-18-38, 53 mL 250x calcium nitrate, 53 mL 250x magnesium sulfate, 0.7 mL Dyna-Gro Pro-TeKt, 3.5 mL pH Down.  (This solution is equivalent to 3.5 gallons water, 7 g Masterblend, 7 g calcium nitrate, 3.5 g magnesium sulfate).  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 = 6.0.  Plants moved to indoor grow room, receiving 9 hours LED grow light per day, plus 3 hours sunlight per day.

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Mar 29 = Day 19.  Red Sails (left), Rouge Grenobloise (right).  Thinned to 1 plant per net-pot.
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Apr 7 = Day 28.  Red Sails (left), Rouge Grenobloise (right)
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Apr 19 = Day 40.  Red Sails (left), Rouge Grenobloise (right)

Apr 26 = Day 47.  Started harvesting lower leaves.  Plants appear identical.

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May 2 = Day 53

May 19 = Day 70.  Both plants were quite large and were falling over.  Harvested all leaves.

At the end of this comparison between Rouge Grenobloise and Red Sails, it is clear that there is no noticeable difference in yield, color, quality, or taste.

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