Can I still use this low-biuret urea

[FruitGrower]

Urea - (NH2)2CO - 5 Pounds https://www.amazon.com/dp/B0054PA524/ref=cm_sw_r_cp_api_glc_fabc_dtn3Fb403TR29

I purchased this low-biuret urea just under two years ago. Is it still safe to use as recommended in this post - http://tropicalfruitforum.com/index.php?topic=26567.0

That same post says biuret concentration increases over time so I don’t want to damage my citrus.  If I can’t use it for my citrus, can it be used to fertilize my other tropical trees?

[Millet]

I think your low biuret urea should be OK to use.

[FruitGrower]

Thank you Millet!

[lebmung]

Got some leaves burnt. You can look at it, if it has formed water molecules or not. Biuret builds up over time. I would test it first.

[sea4]

That is a good idea, I am going to do a test spray.
How many days do you think it would take for damage to show up?

[Millet]

Young tender leaves are much more sensitive to biuret than mature older leaves.  Therefore, this time of year is a pretty safe time to spray low biuret urea.

[FruitGrower]

I can report that a week after applying as recommended, I have no damage to even the young leaves and all the trees are looking nice and dark green. I even have tiny flowers (I think) on the Honey Murcott. I removed a little bit of the clumped power from the top but will be using the rest on the second and third applications.
Millet, is there any benefit to applying more often or in higher quantity? I have quite a bit left and want to be able to put it to good use.

[Millet]

The recommendations given on this forum for the spraying of low biuret urea, are the recommendations of the University of California @ Riverside.  I would advise you to  follow their recommendations.

[FruitGrower]

he recommendations given on this forum for the spraying of low biuret urea, are the recommendations of the University of California @ Riverside.  I would advise you to  follow their recommendations.

Got it, thank you!

[sea4]

U Minn. states that biuret forms during manufacture at temps above 200F, and does NOT increase with storage or in soil (https://extension.umn.edu/nitrogen/fertilizer-urea#applying-to-growing-crops-756364)

I am also wondering what I can do with leftover urea. I have young citrus seedlings which will not be flowering, and a variety of tropicals -I'm thinking bananas and colocasias. Perhaps use a reduced urea concentration spray? I don't think any of the citrus seedlings have new growth at this time, that might be damaged.