The effect of each manure management factor on plant available nitrogen supply is displayed on screen, summarising information as shown in the following example:

Manure details
Manure type Application rate Dry matter content Total N Readily available N	Cattle FYM 35 t/ha 25 % 6 kg/tonne 1.5 kg/tonne
Field information
Topsoil texture Subsoil texture Application date Speed of incorporation	Clay loam Clay 4 November 6-12 hours
Rainfall effects
End of soil drainage Total rainfall	31 March 292 mm
N gains and losses
Total N applied Potentially available N Ammonia-N loss Nitrate -N loss	210 kg/ha 68 kg/ha 10 kg/ha 16 kg/ha
Benefit to the crop
Nitrogen available to the crop: 42 kg/ha

PUTTING IT INTO PRACTICE

The nitrogen supplied by organic manures is only one source of crop available N. Others are: Soil supply. There is a reservoir of soil N and where fields have a history of manure applications this can be large. On these fields sampling to measure the soil mineral nitrogen supply is recommended. Fertiliser nitrogen. The amount of inorganic fertiliser nitrogen required by crops is summarised in publications such as the DEFRA Fertiliser Recommendations book (RB 209). By taking into account the MANNER prediction of crop available manure nitrogen supply, or soil N supply where this has been measured, the amount of inorganic fertiliser nitrogen needed by the crop can be calculated.