Added yellow sticky fly traps to all cubes as a preventative measure to avoid infestation of fungus gnats. So far none have been spotted.
Defoliated and did a little more LST to all the plants to open up the center and give more light to lower shoots.
Blue Dream 3 and Chemdawg 3 started showing some discoloration on the leaves (yellowing around the veins) and also the leaf tips curling down.
Did some research and came up with this...
Possible diagnosis:
- Yellowing around leaf veins could be a sign of Magnesium or Iron deficiency
- Leaf tip curling down could be a sign of Nitrogen Toxicity.
- Both could be caused by improper ph balance in water
Possible solutions:
- Applied Botanicare CalMag+ as a foliar feed and added some to the reservoir. CalMag+ contains Calcium, Magnesium and Iron.
- Diluted nutrients in reservoir to lower amount of nitrogen being fed to plants. Was feeding them at 1300ppm, lowered it to 1050ppm
- Tested runoff and saw it was coming out at 5.4pH so I increased the pH in the reservoir to 6.0. Now the runnoff is testing at 5.7pH, meaning that my rootzone is in the optimal range of 5.5-5.8
Well wait and see how the plants react to these slight tweaks. Hopefully we start to see a nice healthy even green again.