Hydro Tomato youngling issue
Tomato Hydro in Rockwool. these plants are about 20 days old. i attached a pic of a lower leaf branch that recently fell off and it shows purple coloring under the leaves. apparently its a Phosporus deficiency.
i started my youngling mix of around 250ppm mix, in RO Water, using GH flora grow/bloom/micro. i water them by hand 2 times a day with a pour technique. they get 18hrs of light (LED) and i have other cherry tomatoes that i had great success with but they started to develop this purpling about a week ago and has now shed an entire leaf branch.
i upped the PPM to 500, about 4 days ago and mixed to a gallon, which is basically 5ml of grow/micro/bloom with RO Water. Yet i am now seeing a curl and almost like a burn to these leaves. i don't see how 500ppm would nuke this plant at 3 weeks old. when 250-300ppm was not enough...
i always keep PH around 6.0. Just kinda purplexing how these plants are still having issues.