The Decision Support Instrument AgrivisioN'air is an innovative solution that maintain the fertilizer quality of livestock manure when applied. AgrivisioN’air simulator provides for three days a forecast loss of nitrogen by ammonia volatilization, and three indicators “spreading quality”, “spreading equipment performance” and “impact of weather”, for an application of fertilizer defined by the type of fertilizer (manure and mineral fertilizer), the amount, the spreading equipment and the the tillage delay. These indicators and more detailed annual summaries help to adjust their practices (change of equipment, change of the day of application…) to reduce volatilization in the short term, or to help them to understand the changes to implement in a mid-term strategy. The product is quick and easy to use, very intuitive and bring together agricultural practices and weather forecast over a single instrument. That give access to the users to unknown information and allow them to become more effective to optimize the value of their livestock manure.