fertilization planning and fertilizer amounts. Based on scientifically
validated long-term experiments, Flisch et al. (2009) describe the
following agricultural management aspects and soil properties that
need to be considered to determine the fertilizer amount:
Management aspects:
• Crop rotation design.
• Types of previous crops.
• Usage of intermediate crops.
• Crop residue management.
• Number of grassland cuts or grazing of pasture.
• Long-term effects of organic fertilization (correction factors for second
year after application).
• Animal-type-specific nutrient composition of organic fertilizer.
• Consideration of organic farming practices.
• Amount of precipitation during several time periods (e.g. outside
vegetation period).
Soil properties:
• Mineralized N content.
• Soil organic matter content.
• Humus content.
• Clay content.
• Soil structure.
• Nutrient content.
• pH.
• Soil depth (shallow to deep)