Arugula – Roquette

arugulaJan 29, 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 (1/4 tsp) 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.

Jan 31, 2016 = Day 2.  Plants germinated, placed directly under a fluorescent light (2 ft. T8 bulb, 17W, 6500k) for 16 hours per day.

 

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Feb 6 = Day 8

Feb 11 = Day 13.  Installed plant into 0.5-gallon glass jar.  Hydroponic solution composed of 0.5 gal (8 cups, 1.9 L) tap water, 3 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 11 = Day 13
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Feb 20 = Day 22
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Feb 28 = Day 30

Mar 1 = Day 32.  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 39.  Moved plant to indoor grow room.  Plant receives 9 hours LED grow light plus 3 hours sunlight per day.

Mar 17 = Day 48.  Only 3 cups of fluid remain in the container.  Added 2 cups fresh hydroponic fluid.  Began harvesting lower leaves for salads.

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Mar 19 = Day 50

Mar 22 = Day 53.  Only 1.5 cups of fluid remain in the container.  Added 3 cups fresh hydroponic fluid.

Mar 25 = Day 56. Only 2.5 cups of fluid remain in the container.  Plant is currently using about 0.7 cups of fluid per day!  Added 2 cups fresh hydroponic fluid.

Mar 27 = Day 58.  Added 3 cups fresh hydroponic fluid.

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Mar 29 = Day 60

Apr 5 = Day 67.  Added 2 cups fresh hydroponic fluid.

Apr 9 = Day 71.  Added 2 cups fresh hydroponic fluid.

Apr 13 = Day 75.  Added 2 cups fresh hydroponic fluid.

Apr 16 = Day 78. Added 2 cups fresh hydroponic fluid.

Apr 27 = Day 89.  Harvested all remaining leaves.  Total fluid usage = 1.38 gallons.

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