Organic manures are a valuable source of plant available nitrogen (N). However, using either too much or too little N can adversely affect crop yields and quality. By integrating manure and inorganic fertiliser N additions, crop yields and quality will be optimised and pollution risks reduced.
 

WHAT IS MANNER?

MANNER is a decision support system that can be used to accurately predict the fertiliser nitrogen value of organic manures on a field specific basis. MANNER has been developed using results from the latest research, funded by DEFRA, on organic manure utilisation on agricultural land.
 

MANNER can be used either:

• in advance of applying manure to check the likely effect of a spreading policy, or
• to assess the actual fertiliser N value of a spread manure using manure application details and weather data.