lower leaves turning yellow..help!!

hey guys i am growing white widow in a ebb and flow sytem with a 400 wat mh bulb.watering once a day in the middle of the light cycle for 15min. using gh nutes flora series at 500 ppm. ph is at 5.8. plant are in a 8ft by 8ft room with pleanty of fresh air blowing in the room. the plants are just over 30 days old and they seem to be doing good until about a week ago i noticed the lower branches where turning yellow on the tips. what could this be? am i watering to much? not enough? or is my ppm to low? someone please help

early signs of nitrogen deficiency...

what should i do?

well... first thing first... raise your ph to at lease 6.2 then see if the yellowing stops...

if it stops, then you dont need to add anything...

if it continues, then add something that is high in nitrogen... ill use dyna gro liquid grow as a diluted spray and add foliage pro to the nute solution (almost one tsp per gallon of working water)...


or completly flush out and restart your nute solution at at least pH6.2

cool i will try that.. thanks bro

no prob..

just make sure your ph is between 6.2 through 6.7

alright.. what about my water schedule? is that good? im using 4 in. rockwool cubes so they hold a pretty good amount of water.. i just thought maybe i mught be over watering

rockwool holds a good amount of water... keep in mind rockwool is acidic, so the blocks need to be either treated or soaked or flushed with balanced water a few times before use..

so you are once a day for 15 minutes? it should be okay... in the past before switching to dwc i did two 10 minutes a day every other day and that worked well...

stinkynugs420 said:

what should i do?

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Use the search function.... https://www.rollitup.org/search.php?searchid=15414918

do you like dwc better?

is my ppm low?