I have a NFT system. I am growing beans in it right now. But they are showing signs of nitrogen deficiency.
I have a 350 liters fish tank with an unknown amount of tilapias in there.
I have a biofilter too.
I know beans require lots of nitrogen. I also know they are able to get some nitrogen out of the air. But some of my beans have very yellow leaves. Some have them almost white.
What can I do to add nitrogen to the water? I added some worm tea. But it didn't help with anything yet.