Can a complete hydroponic salad be grown in one tote? Watch me violate the laws of hydroponics and find out.I grew a radish, romaine and butter crunch lettuce, cilantro, and 2 Nantes Coreless carrots in a 3 gallon Rubbermaid tote with square holes cut in the lid for the 1.5 inch Grodan Rockwool cubes. This is the same tote I used to grow Kratky hydroponic carrots.
image/text credit: Jeb Gardener
In a process similar to that used to make cotton candy, basalt and chalk are spun into Rockwool, which is turned into cubes. Rockwool is a brand name; the generic term is rock wool.Rockwool cubes, 1 or 2 inches wide and 1 1/2 inch deep, are used for germinating seeds for seedlings that are then transplanted into soil or hydroponic gardens. Cubes 3 and 4 inches wide are used as a primary growing medium for small plants.
Rockwool has a high pH, so you have to adjust your water or growing solution to fit the needs of your plants.I don’t check PH anymore, but in the past, this tap water has started around 7.8 and comes with about 350ppm of salts (mostly calcium I hope).
Light fixture is a 4 bulb 4 ft T5 Milliard grow light 216 watts 6500k.
Tops of the plants were on average 8 inches from the bulbs.
14 hours on 10 off light cycle was maintained by a digital Hydrofarm timer (little white box everyone else uses).
Office environment stayed around 70 degrees F with 40 – 50 percent relative humidity.
Nutrient Solution Recipe (same thing I grow everything in)
1 gallon water
2 grams MasterBlend Tomato 4-18-38
2 grams Calcium Nitrate 15.5-0-0
1 gram Epsom Salt (Magnesium Sulfate)