Over here, in the guaranteed analysis the %N is broken down further into the types of N and among the common forms that I always see are Nitrate N, Urea-N, and Ammoniacal N.

What is not shown is the biuret N. the biuret N is a result of condensation of urea at high temperature from an improperly controlled manufacturing process. The biuret is bad for the plants.

The 5-1-3 ratio fertilizer (25-5-15 W/Trace minerals) that I use, does not contain any urea at all. The nitrogen content of the fertilizer is 10.75 percent ammoniacal nitrogen, and 14.25 percent nitrate nitrogen. - Millet (1,362-)

Dr Manners said
[some of the leaves are showing minor biuret toxicity]
Can you specifically indicate the symptoms of biuret toxicity in the photos, for future reference. Thanks

The yellow tip leaf pictures in the second picture has some good biuret examples. Especially the ones without the dead burned tip. - Mllet (1,61-)

i finally found out that the nitrogen in my fertilizer is urea based from the MSDS on their website. its frustrating that nobody list that information on the labels. there are a couple other 30-10-10 fertilizers available but they dont have their MSDS on their site

millet, while searching for fertilizer information, i found this product:

http://www.plant-prod.ca/product_e.php?id=366&category=80

do you think i can use this in place of osmocote for my seedlings?

thanks,
kay

Sorry, I don't know anything about that product. - Millet (1,361-)

That product should work fine. It is temp release as is Osmocote. I don't see any info as to whether it has minors or not.

thanks Laaz. i will check it out at the garden centre the next day or 2. another thing that i have not seen here in canada is trace minerals by themselves.

the garden centre feels like my second home these days ...

Unlike their water soluble fertilizers Plant-Prod's SmartCote line does not appear to contain micronutrients. If you need just micronutrients, look into Chelated Micronutrient Mix EDTA available at GrowerCentral.

thanks junglekeeper for growerCentral's website. do you know if the public can buy from any of their locations listed or is it a straight mail order arrangement? i wouldn't mind going in to their vancouver location to browse some time.

The location in Vancouver is fairly small compared to a typical store; it's more like a distribution point with some products on display. I suggest you call ahead of time to see if they have the product and whether it can be purchased from them as a retail customer.

Sorry, Haven't checked this thread in a couple days. Yes, I agree with Millet -- second photo, yellowed tips of leaves is typical biuret damage.
Malcolm

I am sure you were not aware of the law, but if you bought citrus trees in FL and took them to any other state in the US you were breaking the law as there has been a USDA quarentine on all parts of citrus except fruit that is inspected and processed for shipment to non-citrus states. This is due to the fact that FL citrus may be contaminated with either Citrus Canker or Citrus Greening.

http://www.aphis.usda.gov/newsroom/content/2008/01/cgfedord.shtml

Interesting. I wonder why they're allowed to sell them if this is the case.

Most of my citrus were purchased before 2008. I think I've had the oldest one for about 7-8 years and it just started blooming. Some of the leaves are a little spotted yellow, but nothing that's got me worried. The majority of the leaves are a nice deep green and this plant sees nothing more than window light and overhead fluorescents.

Since it's my office, it isn't easy to warm my container, but considering where I sit is on average about 78-80 degrees (not by choice), the environment seems suitable. I'm hoping it holds on to at least one of its fruit to maturity. I should do some time lapse photography.