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Kale Problem


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Old 08-31-2017, 12:02 AM
docjay docjay is offline
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Join Date: Aug 2017
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Default Kale Problem

Hi All,

I was hoping someone could help me identify a potential problem I am having with my hydroponic Kale.

They were going fine and then one of the mature leaves turned yellow (and then interestingly it went green again). I then started seeing new yellow growth. One of the mature plants also appears to have some spots. I've also noticed some leaf curl on a mature leaf. All of the problems are pictured below.

The tank is also growing lettuce, basil and coriander all with no problems.

Specs:

DWC (30 litres / 8 gal) - Water is aerated, 2.5 litres per plant (above 2 litre minimum for small plants).

Water Temperature: ~15c / 60f overnight to 20c / 68f daytime

Ambient Temperature: ~12c / 53f overnight, 20c / 68f daytime.

Water is around 2-3 weeks old (was planning to change this weekend, what is the recommended change frequency?)

18hrs of T5 light per day (distance of mature kale leaves from globes approx 70mm on average).

nutrients (16ml diluted into 30l / 8gal) - resulting cF 8
NPK (24-6-31)
Calcium 21.4
Nitrogen 24.25
Potassium 31
Phosphorous 6.2
Sulphur 8.60
Boron .009
Copper .005
Molybdenum .0003
Iron .2
Manganese .009
Zinc .02
Magnesium Sulfate (1.5 teaspoons per 8 gal diluted and added manually).

pH maintained between 6 and 6.4

Any help appreciated.










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