Yellowing and browning . Over fert i think

Picnic101 · Jul 31, 2012

I thought there was a magnesium def so i put some epsom salts in the other night. I have 4 plants in my nft hydro system under a 400 w light. The largest one bottom leaves have been turning yellow and brown the younger cannabis plants seem fine
Please help this is my first grow and im not sure what i should be doing she is far the biggest so dont know what im doing wrong
Thanks.

Have changed the res tank adjusted the ph to 5.8 and let it run for about 3 - 4 hours should i put back in the nutrients to about 400ppm?
Im using Growzilla 25 - 5 - 30 and also nitrozyme . The plant is 3 weeks old. Optimal tempertures are 26 in the day to about 22 at night really unsure what is happening any help would be great .

Picnic101 · Jul 31, 2012

Anyone ? it has spread to some more leaves is it burn?

jswett1100 · Jul 31, 2012

Look more like a burn, a fert burn more makes the leaves yellow.

lahadaextranjera · Jul 31, 2012

Deficient. Up or change the nutes, esp P . Dont like those numbers btw. Try to get a different Bloom fert now. You are getting burn at the edges as this where the plants dissipate heat and they need P to do this. This is why. I would cut out extra N too.

Picnic101 · Jul 31, 2012

lahadaextranjera said:
Deficient. Up or change the nutes, esp P . Dont like those numbers btw. Try to get a different Bloom fert now. You are getting burn at the edges as this where the plants dissipate heat and they need P to do this. This is why. I would cut out extra N too.

Would u be wanting more of a even number eg 5-5-5 as such ? will go get some a different fert tommorrow

lahadaextranjera · Jul 31, 2012

Well to be honest I need a bit more info but yes, when they go into flower they need less N and more P & K. They've been getting plenty of N by the look of it. The Ph is important. Soil 6.5 - 7.0 is ideal.

U said 3 weeks, I take it ur in veg and not 3 weeks into 12:12. How tall are they? Pot size? Whole picture would be good. What water are u using ?

Picnic101 · Aug 1, 2012

lahadaextranjera said:
Well to be honest I need a bit more info but yes, when they go into flower they need less N and more P & K. They've been getting plenty of N by the look of it. The Ph is important. Soil 6.5 - 7.0 is ideal.

U said 3 weeks, I take it ur in veg and not 3 weeks into 12:12. How tall are they? Pot size? Whole picture would be good. What water are u using ?

Some more pictures. THe yellowish / browning is happening in the middle of some of of the leaves as well. I am 3 weeks since germination so would say 2 full weeks in veg . i am on 19 - 6 they around about 10 cm tall . I am growing in hydroponics using a nft system with 8 pots. only using 4 to grow . Using Tap water which is brought down to 5.5 and let to sit overnight to get rid of the chlorine.
Thanks

lahadaextranjera · Aug 1, 2012

yes, I sticking to what I said before

Picnic101 · Aug 3, 2012

lahadaextranjera said:
yes, I sticking to what I said before

Thanks dude using flairform grow which is 3 -1 - 5 and the plants have started growing like they used to thankyou! . should i prun cut off the leaves which have been affected or?

Sencha · Aug 4, 2012

No reason to remove fan leaves unless they are blocking a bud site that you want to open up. If a fan leaf wont come off with a gentle tug, leave it (unless it's burnt to a crisp).

Also, no reason to leave the water out. Not enough chlorine in your water to do harm. Ph you're water after you add nutes and before you feed your plants.

Yellowing and browning . Over fert i think

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