Lettuce – Red Sails

431gFeb 10, 2016 = Day 0.  Plants started from seed (Botanical Interests).  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.

Feb 13 = Day 3.  Plants germinated, placed directly under a fluorescent light (2 ft. T8 bulb, 17W, 6500k) for 16 hours per day.

 

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Feb 17 = Day 7

Feb 20 = Day 10.  Installed plant into 11 cup (0.69 gallon) plastic container (Vega).  Hydroponic solution composed of 0.69 gal tap water, 4.125 mL Dyna-Gro Liquid Grow.  Nutrient concentrations (in ppm): N 111, P 143, K 79, Ca 32, Mg 8, S 0.8, Fe 1.6, Mn 0.8, B 0.3, Zn 0.8, Cu 0.8, Mo 0.01, Ni 0.002, Co 0.024.  pH = 6.0.  No pH adjustment required.

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Feb 28 = Day 18

Mar 1 = Day 20.  Based on information obtained in this post and this post, it seems that the pH of the Liquid Grow-based hydroponic solution tends to drop below 4.0 by the end of the growing period, which is not ideal for nutrient uptake.  Therefore, I have switched to a Masterblend-based solution.  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.

Mar 8 = Day 27.  Moved plant to indoor grow room.  Plant receives 9 hours LED grow light plus 3 hours sunlight per day.

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Mar 19 = Day 38.  Leaves are ready for harvesting.
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Mar 29 = Day 48

Mar 31 = Day 51.  Harvested all remaining leaves.  Final statistics: 9 cups (0.56 gal) of fluid used.  Final pH of fluid = 7.0.

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