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Yellowing leaf tips on new growth, also growth slowing

strungout88

New member
Hey all. First time I've needed a little help or input with a grow. Let me get through my specifics and then I'll get to the problem.

I have a hydro dwc setup with 3.25 gallon buckets. The strain is white widow grown from seed. I use advanced nutrients sensi grow a and b as my base nute. I also add hygrozyme, Fulvic acid, Voodoo juice, sensizym, and sm-90. The plants are in veg still, 33 days since I started germ. They have been on nutes for 20 days. They are being grown out of rockwool set in hydroton cubes. The temp in the room is a little high, fluctuates between 79-83 during the day, and around 69-72 at night. They are on 18/6 light schedule. The humidity is pretty steady between 35-41% in the room. I have the nutes at 700ppm in the buckets at the moment, with all of the the ph's between 5.69-5.74. I change water and up nutes weekly. I also have a circulating fan moving air over the plants and around the room.

So the problem is for the past 4-5 days growth has been slow, they are still growing about 3/4 an inch a day, but the new leaf sets aren't filling out as quickly as before. They are barely getting bigger at all. Also the tips of the new growth leaves are getting some light yellowing. the rest of the plants look absolutely gorgeous otherwise, close to perfect except for these problems. This is my first time using AN and I just noticed that it says to use voodoo juice once every three weeks. I have put it in the last 3 weeks in a row, don't know if that is the prob or not but I won't be adding it next time. Anyway here are the pics.



Let me know if you think you can help.
 

strungout88

New member
57221DSC01162-med.JPG
 

RC_Colas

Well-known member
Veteran
The 'little' yellowing, and let me say 'little' again is nothing to worry about. Your plants are very healthy and growing at a rate to be expected...plants will often sprout then fill-out. The small bit of yellow tips may be that you setup is a bit on the dry side 35-41% depending on how hard the fan is blowing. I prefer 50% humidity with a light breeze:) Remember that as your plants get bigger they will transpire more and increase the room humidity as a matter of course.

Your plants look great!

Cheers

RC_Colas
 

strungout88

New member
Thanks for the input RC. I appreciate the compliments as well. However I do think there is something going on here, the yellowing has gotten marginally worse since I put the pics up and again it is like the main stem has stopped growing the newest two leaf sets, it is getting taller but no more leaf or outward growth from the main shoot. Maybe I should just flush them and get the voodoo out of there. Can't think of anything else really?
 

RC_Colas

Well-known member
Veteran
Hey strungout88,

I have not grown WW, but I have had a number of strains that show upward growth (stretching) followed by filling out with leaf:) I am not an expert on the PPM for your plant size, but it may be a bit high and nutrient burn does show as yellow tips and yellow/brown spots on the leafs. Try backing off on your nutrient level, as long as the girls do not start to fade in the green (N deficiency).

On the oxygen comment by VenturaHWY, are you using a straight drip system? If so I would highly recommend converting your buckets to 'Bubblers' at this stage in the plants life. All you do is unplug the air-line from the drip system and plug it into the aquarium airstones...I prefer the 8''. Place the stone directly under the root mass and watch your plant explode:)

Cheers and good luck!

RC_Colas
 

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