Determination of nitrogen content in urea

Urea is a common nitrogen source of all solid nitrogenous fertilizer, widely used as a release of nitrogen fertilizer.Urea standard crop nutrient level NPK level) for 46-0-0.Therefore, elements it contains 46% nitrogen (N), phosphorus (P) and 0% 0% elements of potassium (K).As a result, nitrogen per unit transportation cost is very low.Under the effect of enzyme activities of urease, the soil after urea decomposition.The presence of soil moisture and enzyme, urea usually hydrolysis and translated into ammonia and carbon dioxide.The reaction occurs after urea dissolves in water.Under the condition of alkaline needs about 48 hours to complete the reaction.Without protection, ammonia will evaporate.After urea fertilizer to the soil surface or plants, without protection, with 50-90% of the nitrogen will be released for ammonia.As a result, the urea must be applied to the soil rather than soil surface, in order to store nitrogen fertilizer.In this paper, the determination of nitrogen in urea fertilizer samples is to use KjelDigester K - 449 K (kjeldahl digestion apparatus) and KjelMaster system - 376-375 / K (automatic kjeldahl nitrogen determination apparatus).

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