Cucumber leaves with yellow margins and dark veins

Cucumber    UK

Hello, this is my fist deep water culture (DWC) grow and decided to try Cucumbers for my Guinea Pigs. The plant is about 4 weeks old and I'm on 18 hours of light dripfeeding for an hour every 6 hours. I'm using FloraGrow's Micro and Bloom 10ml of each for week 3 for a 15ltr bucket. pH is kept at around 5.8 to 6 checked and corrected every 2 days. I started to see yellow spots and margins on the older leafs and now they are turning yellowish with dark green veins.
I thought it might be a Magnesium deficiency so brought some Epsom Salts and spry every night but it does not seem to be making any difference. Does anyone have any ideas, its probably something I'm doing wrong but not sure what. Its very difficult to identify the issue from pictures online. Any help would be appreciated.

Posted by: Colin Talbot (2 points) Colin Talbot
Posted: November 12, 2014


The images show a symptom that is known as interveinal chlorosis. This is often caused by a zinc deficiency. Zinc deficiency has been shown to be related to pH - soils with high pH tend to have low zinc but considering your pH that doesn't seem to be the case. Zinc is also linked with phosphorous in the soil. Do you know if the the Micro and Bloom contain zinc? I'm not familiar with them, nor the set up I'm afraid but I would not be surprised if they didn't given the symptoms on your cucumber leaves. Zinc deficiency can be corrected through the addition of organic matter or zinc fertilizer.

Posted by: Lindsay McMenemy (2 points) Lindsay McMenemy
Posted: November 13, 2014

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