I'm a First grower and have problem with my plant the leaves turning yellow

use cal mag ? how much PPM/ph / Temp

Same happened to me. Do NOT overwater those seedlings and if you add nutrients keep the ppm around 200. Keep water high enough in containers so any splashing and bubbles wet your hydroton and will also wet your rockwool or whatever you use the hold the seedling. Then once the roots are long enough that they touch the water you can lower the water level so the rockwool can dry a little while the roots still remain in the water. This is what I'd do for nuts: Week1 0 ppm Week2 200-300 ppm Week3 600-850 ppm Make sure you use Cal/Mag supplement bc if you're using RO/ DI water it will have zero nutrients or minerals. Hope this helps. Good luck!

. This is a hydroponic or a soiless feed chart. Make sure you ph your water at 5.8 for veg, check everyday. Feed chart for photos. Day their born, 400 ppm, 0.8 ec. See good growth that week up to 500 ppm, 1.0 ec. Next week and you see good growth, 600ppm 1.2ec Every week you increase 100 ppm if your seeing good growth. If your not seeing good growth then stay with that amount an extra week. Stop increasing when hit 800 ppm, 1.6 ec. Only give more if you see they really need. Soilless recovers or goes bad very quickly.. If their autos start at 200 ppm from sprout and work your way to 600 to 650 ppm. Keep your water cool with frozen water bottles around and inside your rez if you have one..Clean your buckets once a week or 2 If this is an auto flower your ppm at 2 weeks old should be 350 ppm 5.8 ph. Stay with that until you see improvement , then start upping her feed by 100 ppm a week

@Roberts Nutrition is 150 ppm and ph 5.9 that is good for the young plant? I don't use anything to keep a bucket solution sterile.

Nutrition is way too strong. Is ph 5.8 in solution? I check mine 2 times a day. Are you using anything to help keep bucket solution sterile to avoid root rot?