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All urea contains an impurity called biuret. Do you know what the content of the biuret that was in the urea you used?
Biuret is formed from urea with storage, especially under higher summer temperatures. Urea should not be kept for a long time.
What is considered low biuret urea by the University of California and the University of Florida is urea with a biuret contend of 0.25% biuret.Time has passed to apply a winter prebloom foliar application of low-biuret urea. The most effective period for summer spray is between July 1 and July 26. Use summer applications of low biuret urea: (1) If your goal is to increase fruit size, and (2) if your tree is carrying a heavy crop. Spray either in the early morning or early evening.
Quote from: Ilya11 on March 18, 2020, 05:02:50 AMBiuret is formed from urea with storage, especially under higher summer temperatures. Urea should not be kept for a long time.I keep my fertilizers under dry conditions with desiccants.