[ Contents | Search | Post | Reply | Next | Previous | Up ]
Date: 21 Dec 2001
Remote Name: proxy1-external.stcla1.sfba.home.com
First time aquaponic grower, have small sytem, 100 gallon tank, 50 6" coy and 6" pvc grow tubes.
My tomatoes are showing iron/zinc/magnesium deficiencies, also the system seems to run very low on pottasium. I tested the water with a NPK test kit, Nitrogen and Phosphorus are off the scale and Pottasium is non-existant.
Symtoms of plants are yellowing of the NEW growth, old growth still green, stunting, and necrotic lesions between the viens on the leaves,(consistant with MG deficiency)of old growth.
I foliar fed with a combo of iron/zinc/magnesium with a little potash, this greened them up considerably.
Is this normal? Will a properly stocked system produce all trace elements needed? And Pottasium?
Can I supplement with kelp meal? this stuff is high in trace elements and pottasium, I would put some in a nylon stocking and hang it in one of the tubes to slowly release in the water?
Thanks for any help!