Little problems

Hello!
i grow in nft system whit advanced hydrophonics of holland nutriens,
And after i rooted plants to rockwool i placed them to nft system and week after that i find some problems leaf joint are turning yellow/white
I use 4x600w led but i dont use all power of them i use like 50%
Water temperature is 19 celsius and ph5.7 and ec 0.7
If anyone can help me whit this situation i will be very happy! And im sorry for my english..

I’m seeing a potassium deficiency at least or the start of light bleaching. Your EC is in a proper range for age so wondering about the lights.

On my last grow i got that same problem and i cut them but now that think is again on my plants pics from last grow

hotrodharley said:

I’m seeing a potassium deficiency at least or the start of light bleaching. Your EC is in a proper range for age so wondering about the lights.

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thank you for reply i will take shut some light off and lets see what happen.

hotrodharley said:

I’m seeing a potassium deficiency at least or the start of light bleaching. Your EC is in a proper range for age so wondering about the lights.

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do you know what i should use for get more potassium wich i can use whit ahh nutrients ?

mdmw47 said:

do you know what i should use for get more potassium wich i can use whit ahh nutrients ?

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Suggest a PK boost. Whatever is available without sending for it. And back those off about 6” for a while.

hotrodharley said:

Suggest a PK boost. Whatever is available without sending for it. And back those off about 6” for a while.

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Don't do that until flowering, Use some NITROZYME or Kelp for K in veg

etruthfx said:

Don't do that until flowering, Use some NITROZYME or Kelp for K in veg

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Thank you, i just think that i use water chiller can that chiller make that kalium or iron deficiency becouse i never haved problem like this before

mdmw47 said:

Thank you, i just think that i use water chiller can that chiller make that kalium or iron deficiency becouse i never haved problem like this before

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It can yeah ph is also correlated to temperature

I disagree with potassium deficiency. I use Advanced Hydrophonics of Holland myself on Coco. It has more than enough Potassium, I always find it hast too little Nitrogen in its mixture. I usually start with nothing, then half of dosage only Bloom and Micro adding some more Mono Nitrogen. The suggested N-P-K Ratio is 3-1-1 in Growth. AH delivers 3-3-6 if standard mixture is used. This gives you yellow leaves very early.

In addition if you have hard (Cacium rich) water (EC>0.4) you should add osmosis water to lower plain EC. AH Micro has a lot (7%) of Calcium in it. Together with water initial calcium this may lead to lockout.

biker61 said:

I disagree with potassium deficiency. I use Advanced Hydrophonics of Holland myself on Coco. It has more than enough Potassium, I always find it hast too little Nitrogen in its mixture. I usually start with nothing, then half of dosage only Bloom and Micro adding some more Mono Nitrogen. The suggested N-P-K Ratio is 3-1-1 in Growth. AH delivers 3-3-6 if standard mixture is used. This gives you yellow leaves very early.

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Sorry I mistyped, at the beginning I use only Grow and Micro, not Bloom and Micro.