White Cheese Auto Seedling - Nitrogen Def ?

Hi All,

I wonder if you can help me with some advice - Basically the first set are yellowing on the 2 seedlings. One is worse than the other.

Light - 250w HPS
Method - 2 plant 20L DWC bucket
Age - 10 days from sprouting
Nutes - 400ppm Veg - Tap water is 290ppm so a total of 110ppm nutes
pH - 5.6-5.8
Temp - 70-75F
Medium - Rockwool / Hydroton

It looks like a N def to me which I guess could be cured by increasing the nutes - finally they were just on plain ph'd water until 6 days ago when I added 10ml of veg nutes to them (400ppm total)

Any ideas would be appreciated - As always great site



One final thing to note is that the cotlydons on the worst affect seedling are starting to turn brown...

Thanks

BtS

Anyone got an opinion ?

your "Tap water is 290ppm" witch is hard water, try N-P-K of 7-4-10 ppm of 600. Seedlings don't eat very much.

Do you think the worst seedling looks nute burnt ? That's what I am thinking now tbh...

No it looks like N deficiancy. Plus you shouldn't be feeding until after 2 weeks

Thanks for the reply - they are exactly 2 weeks from germ today so would reco adding more nutes ? I changed the res today and backed off the nutes to 380ppm my tap water is 280ppm and raised the light - i will check her tomorrow and if looking worse then i think i will add more nute up to 450-475ppm

Does this sound sensible ?

Checked on my ladies today and I am convinced I burnt them - One is weaker than the other which is improving but slowly and the stronger is now starting to explode

Thanks for the input guys - Hopefully onwards and upwards from here on in

400 PPM is far too high for a plant that young, much less an auto. In my limited experience with autos I have learned they do not like nutrients at all. In hydro? Start at 100PPM and then wait for the plant to show a need to increase.

My Dinafem White Widow Auto got huge and never exceeded 450PPM. Great smoke too. But an Auto AK hated 200PPM and stunted until it was lowered to about 125PPM and still shows slight OD.

If you fed that thing, you burnt it. Seedlings do not need nutrients right away (they have built in food storage in the form of cotyledons). It is normal for the cotyledons to dry and brown, but yours look a little young for that to be happening quite yet.

My recommendation would be to lay off the nutrients for a few days or a week and see if they improve.

Well just to clarify by base water is 300ppm so I added 100ppm nutes - I can't just back off the nutes completely as I am going away for a bit and won't be able to leave with just ph'd water otherwise they will be starving when I return...

I reckon they will fine now - The stronger seedling is taking off and the other is recovering slightly slower but I think they will both be fine - i will post some pics tomorrow.