A few days ago I transplanted some clones into rockwool cubes. And now about 20% of them are showing blotches of rust.
PPM - 480
PH - 5.9 - however, I just caliberated my ph meter and it was off so the actual ph was around 6.3.
I've researched rust spots, not sure I found a universal consensus on what causes it. Some say fungus, which seems unlikely in my case as they have been gives very little water to so far, and the humidity is on the low side.
Nutrient lock-out has also been mentioned. I know my ppm is on the low side, but given how young they are I wouldn't think that low nutes or even lockout would be showing such signs.
What could this be?
PPM - 480
PH - 5.9 - however, I just caliberated my ph meter and it was off so the actual ph was around 6.3.
I've researched rust spots, not sure I found a universal consensus on what causes it. Some say fungus, which seems unlikely in my case as they have been gives very little water to so far, and the humidity is on the low side.
Nutrient lock-out has also been mentioned. I know my ppm is on the low side, but given how young they are I wouldn't think that low nutes or even lockout would be showing such signs.
What could this be?
