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Agroecology and Environment

Climate normals


Climate normals are the mean climate for a 30 year period. Climate normals were calculated for the new period 1961-90 (Olesen, 1991).

Organic crop rotations for grain production


Organic farming relies on a fertile interaction between soil, crops and livestock. The character of the crop rotation is therefore of great importance for both productivity and sustainability. A crop rotation experiment was started in 1997. The experiment will investigate the effects of rotational design and of fertiliser level on yield, nutrient leaching and weed infestation.

The experiment is part of the experimental units for research and experimentation in organic farming coordinated by the Danish Research Centre for Organic Farming (DARCOF).

SimDen - a simple model for quantification of denitrification and N2O-emission


The denitrification and N2O-emission are important both from an agricultural and an environmental point of view. However, the processes are, due to their high spatial and temporal variability, very difficult and resource demanding to quantify, and the only possibility is often to use simulation models. Simulation models, however, often need more input information than what is available. Therefore, two simple empirical models for quantifying the N2O-emission and denitrification are presented, where only information about

  • soil type and N-input is needed for “SimDen”, or
  • clay content and N-input is needed for “SimDen-clay”.

Soil quality in organic farming: Effects of crop rotations, animal manure and soil compaction