Getting close to harvest (about a week), this is 20 days from transplant and 27 from germination! Few notes:
- Some of the lettuce is significantly smaller than others, this is happening in both reservoirs and oddly enough on opposite corners of the reservoir even (WHY?!?!)
- One concern I always have with DWC is water temperature. I noticed on 9/8 that the plants appeared to “wilting” and the roots even looked yellowish. While this doesn’t appear to have really stunted my growth, it’s far from ideal, my current reservoir temp is around 23.1C.
- Instead of completely emptying my reservoirs once a week and refilling (a common practice in DWC) I am choosing to just add in more nutrient/water. This is partly just to be lazy and not waste nutrient, but also because it’s a short-term crop. If this was a plant I planned to keep for months I would not take this approach as the reservoir can get way out of balance (this is the downfall of PPM as a measurement of nutrient instead of individual ion based measurements).
Left Side Starting:
PPM - 909
PH - 6.7
Right Side Changes: It appears that about 1" (1/2 gallon?) of water has been consumed, because more nutrient than water was consumed the PH rose. I added 1/4" gallon of water and also added 1 ML PH down which lowered the PH to 6.
Right Side Starting:
PPM - 1110
PH - 5 - VERY LOW!!!
Right Side Changes: It appears that about 1.5" of water has been consumed. I added 3/4 gallons of water (I try to not add PH up/down unless I have to and just regulate with more water/nutrient at least in DWC), which brought the PH to 6.