Hi! I am a new grower trying to learn the craft. I have been having issues with yellow and browning in between the veins on some leaves. It is moving up from the bottom of the plant and I believe that means nutrient problem. I did a flush to try and corrected and the problem continued. My medium is rockwool and I have noticed what seems like calcium buildup on the underside of the cube. I have read through research that you need 15-30% runoff to push the old nutrients out of the bottom and should water 5-7 times a day.
I use Athena pro and my irritation is a floraflex micro drip. I am watering 1.5 ec in veg and flower.
So my first question is how do I achieve the 15-30% runoff without overwater my plants?
Also any advice or knowledge into what these leaf damages tell you would be appreciated! I only started growing about 4 months ago and I am trying to learn all the ins and outs of being a good grower!
Over watering means you don’t let it dry out some in between waterings. You water till a bit comes out. Not a ton. I do this by using measuring cups until i figure out how much i can pour without having to clean up a bunch lol.
Looks like your over doing it a little on the waterings. Reading about growing and putting it into actual real life are 2 different things. The calcium build up on the blocks is probably lock out that’s been happening overtime from to many nutrients. 5 - 7 feedings a day. What temps are you running? Is that a drain to waste system?
Also i cant see the new growth? Can you shoot a pic of the tops so we can see the new leaves and shoots growth. I wonder if you put the block onto anothe rockwool slab it might make the plants roots revive the new growth more. And i think the bkocks need to flushed here and there during/between feedings. I dont grow in blocks all the way to flower. I actually stopped using them all together.
Some kind of burn. Nutes or ph issues. I do that to my home plants from not letting out the salt enough i believe. My rh in my room at home is usually crap so the plants don’t sweat.
Your problem is a fungus disease called Alternaria…do you see the brown ‘necrotic’ lesions…they are surrounded by a yellow halo…That is the hallmark giveaway of Alternaria infections.
They normally do begin on the lower leaves of the plant and if left untreated, randomly spread up the plant and continue to kill leaves.
The good news is you can stop it dead in it’s tracks with an application of hypochlorous acid. You may want to contact @nacho151, I believe he had the same issue earlier…he can help you out and if need be you can contact me via PM if you need more help.
Good Luck…Bob
PS…@codyjester…Welcome to the community! You’ll benefit greatly from all the experienced growers here on GN…an excellent group very generous to share their insights! If you can start a grow log and fill out all the relative information we can follow along with you and offer much more pertinent information if we know your inputs !
@codyjester read this thread and it will help a lot to kill Alternaria. Defoliate every leaf with spots and treat every other day over 3 days with hydrogen peroxide until you can get the hypochlorous acid, them fog your plants with the hypochlorous acid. It will kill the fungus really fast! I almost forgot, Welcome to the forum!
I have pulse monitors to make sure my temp and humidity is keeping my Vpd in range. But with that being said veg is around 75-77°f and 60-62 RH. Yes I do drain to waste.
