Backyard Aquaponics
A place to discuss aquaponics

Don't know but I've got exactly the same prob with my horsh radish. Looks like a bed for the reprobates!

I have this problem as well. On my thread I have some pictures of Ceylon spinach showing 3 levels of deficiency growing reasonably close together in the same bed. This is my theory on it.
I think that when certain nutrients are low (such as iron or magnesium) there is little to none in the water flowing through the system. The plants get what micro nutrients they can from the "solids" in the media. As this can vary depending on what plants came before, the size of the root system or if there are other plants accessing (ie stealing) it then these isolated nutrient deficiencies could occur. When I dose up the micro nutrients (for example if I see iron deficiency I add some Iron chelates or apply seasol) the problem is less pronounced or goes away.

In one bed I had lettuce and in the middle of the lettuce I had basil. The lettuce was growing well (as they do) and the basil had iron or magnesium deficiency. The lettuce was fine. When I dosed the whole system the symptoms largely disappeared. When I gave a local dose to the basil it resolved it. The lettuce could have been acting like a filter removing the nutrients they required and leaving less for the basil and /or the basil is more sensitive/has greater requirements for certain nutrients.

Anything improved with the plants? The original post I noticed it looks mostly like a temperature problem.

Beans, Cucumbers, Zucchini, Capsicum all like more heat not sure whats up with the Rocket. The others that are doing well like it cool. Mr D. pointed out this but I'm wondering if things have warmed up and did it make any difference.

Cheers

Marc - lettuce likes it cool, basil needs to have the water above 60 F. Don't know if that helps you but it's a thought.

Scotty, interesting and it may be temperate related issue in the sense that at the lower temps the capacity to absorb nutrients at low levels may be impaired. It is summer over here and the air temp in the greenhouse (where this particular growbed is) would be in the mid to high 30C (90-100F) during the day and the water is 18C to 23C (65-73F)

That is interesting Marc. I don't know if it's related to the water temp, it doesn't really sound like it but who knows. I've never noticed anything like this with water temps that high and it stays cool here in the Summer. On the other hand it may be a combination of things and this could just be one part.

too true Scotty, but thats half the fun of aquaponics. always something interesting going on.
I do agree that it is probably a combination of factors, as are so many aquaponic problems.

Could it just be genetic variation? When it comes to the crunch one out performs the other? Unless the horseradish was propagated by root cuttings...

Things are going pretty much the same as they were. I've managed to buffer the pH and get it up to 6.5 (it was hanging around 6.0), which seems to have been good for my cherry tomatoes. I put some magnolias in which immediately withered. I put in 4 baby spinach, two thrived, two died.

The water has varied from 14-24 degrees the last 2 weeks, fun Victorian weather for you.

At the moment I've just decided to plant the stuff that grows well, and avoid the others.

I concur with Freedy. I found it easier to plant the stuff thats growin atm. and try again later on with the others

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It was.