Modellanlage zur Bestimmung von Ammoniakverlusten aus organischen und mineralischen Düngern unter kontrollierten Bedingungen

A model system for the determination of ammonia losses from organic and mineral fertilizers under controlled conditions A closed-dynamic model was developed for the continuous registration of losses of ammonia. NH₃ escaping from the soil surface is introduced to an acid trap. The resulting increase in pH is equivalent to the amount of NH₃ and is recorded by an automatic data recorder. Wind velocity in this system can be adjusted between 100 and 400 L air/h, which corresponds to a 12 to 40-fold total air exchange per minute. Temperature can be regulated between +5°C and +30°C. In addition, air humidity can be controlled. The testing of the model revealed deviations of maximally 0.6% between measured pH value and destillation. The average recovery amounted to 97.2%.