Can any one answer this...it seems pretty simple but cant seem to get anything in plant problems to match ...i keep having a problem when i switch from one growth stage to the next ...i had ak47 and burmese kush plants in 4x4x4 rock wool cubes which i watered daily by hand with a basic flora nova grow and hygrozyme nutriernt mix the plants flourished ..i did this for almost 7 weeks and was able to sex out the true males...i then took my remaining females and put those into a 4'x4' ebb and flow table and set them up to get the same nutrient mix flooded in 3 times a day ...mind you there were no roots coming out of the bottom of the cubes they had been air pruned from growing out... . i had the water level set to just touch the bottoms of the rock wool cubes which were in white pots on top of about 4 inches of hydroton rocks...the cubes always stayed wet it seemed ..and 4 days later i noticed the growth tips begin to turn pale yellow...my ph is spot on 5.9-6.2 and my ppm is about 900...the same strength that they were getting when i was watering by hand....are the rockwool cubes just drowning the roots by holding too much water causing them to uptake not enough nutrients because they cant breath ...i have turned off the nutrient pump and just have a few air stones in the resevoir so that hopefully the rock wool cubes can dry out some.
zoomatl Reviewed by zoomatl on . Ebb and flow problem...why are my plants turning yellow? (merged) Can any one answer this...it seems pretty simple but cant seem to get anything in plant problems to match ...i keep having a problem when i switch from one growth stage to the next ...i had ak47 and burmese kush plants in 4x4x4 rock wool cubes which i watered daily by hand with a basic flora nova grow and hygrozyme nutriernt mix the plants flourished ..i did this for almost 7 weeks and was able to sex out the true males...i then took my remaining females and put those into a 4'x4' ebb and flow Rating: 5