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PostPosted: Jun 20th, '19, 09:42 
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Joined: Jun 15th, '19, 21:25
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Location: USA, Kansas
This is my first go at this. My cucumbers leaves are yellow. The system is about 30-40 gallon tube, 8 gold fish about 3 to 4 inches long, with two 5 gallon buckets with lava rock. They are running flood and drain with self starting siphons. The bucket with the yellow leaves are cucumbers, the other bucket has zucchini squash. What could I be missing for my cucumbers?

Thanks

Sparky


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PostPosted: Jun 20th, '19, 23:57 
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Looks like they both get fed from the same water source with neither really getting first shot at the nutrients so either something is different in the buckets or with the plants. Here are a couple of thoughts -

1. Sometimes root rot can do this because the plant has troubles taking up the nutrients through the roots.

2. Might be some carryover from whatever they were started in (if it contained fertilizer or nutrients and wasn't completely cleaned off).

I guess I'd try foliar feeding the plant with the deficiency using an fertilizer that contains nitrogen in the form of nitrate but no ammonia or urea. I think what you're seeing is probably a potassium deficiency - make sure the fertilizer provides this along with some calcium and magnesium (just to cover the bases in case I'm wrong about what the deficiency is). You'll probably need to do this a few times at weekly or biweekly intervals until the symptoms disappear.

Another option for taking care of just the potassium - check your water pH and if it's time to adjust it back up you could give the plants some potassium by using potassium carbonate or potassium bicarbonate or if you are trying to avoid the carbonates use potassium hydroxide (but use with caution).

Cheers


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