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The combination of urea and ammonium nitrate has an extremely low critical relative humidity (18% at 30 °C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N) known as UN32 or UN-32, which consists of 45% ammonium nitrate , 35% urea and only 20% water.
The best option in terms of recovery is to water the plant with more water, maintaining damp soil. Stop fertilizer usage until the plant is hydrated. If a plant is burnt due to an abundance of nitrogen or ammonia, stop fertilizer usage and continue to water. If there is severe root rot, the function may not be able to recover and the plant may die.
Urea is highly soluble in water and is therefore also very suitable for use in fertilizer solutions (in combination with ammonium nitrate: UAN), e.g., in 'foliar feed' fertilizers. For fertilizer use, granules are preferred over prills because of their narrower particle size distribution, which is an advantage for mechanical application.
The high water-solubility of urea can be disadvantageous in some cases as well. [1] One particular technique to mitigate these disadvantages has been to encapsulate prills of urea with less-soluble chemicals. These coatings permit the gradual release of urea in a controlled fashion, allowing for less-frequent applications. [1]
The early product had 60 percent of the total nitrogen cold-water-insoluble, and the unreacted (quick-release) less than 15%. Methylene ureas, e.g. methylene diurea, were commercialized in the 1960s and 1970s, having 25% and 60% of the nitrogen as cold-water-insoluble, and unreacted urea nitrogen in the range of 15% to 30%.
Water damage caused by ice or snow is generally covered, but you will want to consider that there are several ways for moisture to enter your home — and some may not be covered by your policy.
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