After starting the program, you'll see four screens to fill in: region, soil, crops and fertilisers. With a wizard you are guided through the screens when you are a new user. Only easy available information is asked
You use the data of one of your fields: the last years crops with their fertiliser applications and the realised yields, and the actual and/or planned crop. The regional weather data for the corresponding years are used. For the actual crop and the crops afterwards, you use a reasonable expected yield and expected fertiliser applications. For this preview, the regional average weather data are used, and every two weeks the weather data from the past period are actualised by means of an internet connection.
You can immediately see whether the crop demand is covered by the availability: the green line (available) stays above the red one (crop uptake).
The measured values (circles) do correspond fairly well with the calculated level (solid line). This is a check on reliability of the model results.
Starting a new crop, the graph is reset at zero to enable you to see the losses in every crop period and following bare period.
The contribution of all different typs of organic matter in the soil is show in mutual ratio.
Besides nitrogen, the balance of potassium and phosphorus is shown. Also you see the amount of nitrogen which is added to the soil organic matter or released from the soil organic matter as the net result of application and decay of organic matter. Losses due to leaching or denitrification are calculated.
What is the trend in the amount of soil organic matter with this crop rotation or crop sequence?
© Louis Bolk Instituut, Driebergen, the Netherlands, 2021