Lettuce – Red Sails

Feb 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 7-9-5, 0.8 mL pH Down per gallon of tap water. N-P-K (in ppm): 22-12-13.  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.

 

Feb 17 = Day 7

Feb 20 = Day 10.  Installed plant into 11 cup (0.69 gallon) plastic container.  Hydroponic solution composed of 0.69 gal tap water, 4.125 mL Dyna-Gro Liquid GROW 7-9-5.  N-P-K (in ppm): 111-62-66.  pH = 6.0.  No pH adjustment required.

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.  N-P-K (in ppm): 103-41-168.  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.

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

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.