My tree do good on this just getting feed back.
Sounds good but you will have to add a lawn/grass fertilizer (33-1-1) and mix that in a half and half to get a 50-13-23 ratio and feed according to instruction to get ma 25-6.5-11.5 and you have it. I use Miracid 30-10-10. and flush the pot every 3 weeks to get the build up of P out and I feed the waste water to my other crops.
All my sweetlee tangerine tree have put on or are putting another growth spurt. I have had 7 growth spurts since September 1 with this fertilizer. I also use the 33-1-1 grass food and it works good but doesn't have the micros. I just use it to push the nitrogen supply in summer.
check out the link below, where I got the advice that really made a difference. I was ready to scrap my citrus at that time and they are doing very well now.
PS how are your kumquat seedlings doing. They look like nagami kumquat trees.
Here is a link that might be useful: http://forums.gardenweb.com/forums/load/citrus/msg062354098834.html?19
This post was edited by poncirusguy on Mon, Mar 17, 14 at 11:20
And, that would be a HUGE amount of N in a container plant. Possible issues with N burn. If your tree is doing well with this fertilizer, I would not add additional N unless you see evidence of low N (overall chlorosis). Flushing will help, but not sure it's necessary if you simply skip adding the additional N. Be sure this fertilizer has the full complement of micros as well. In general, Jack's fertilizers are good quality products.
I just use this and they love it