Increasing grasland biodiversity by extensive grazing

Aims:

• Investigation of the relationship between excretion behaviour and the development of plant diversity
• Examination of the influence of extensive grazing on nutrient cycles and sustainability of a pasture system
• Development of extensive grazing systems with acceptable pasture performance and increased plant diversity

Field trial:
startet 2002 in Relliehausen
3 treatments:

• High grazing pressure (aiming at high output)
• Low grazing pressure (aiming at increased biodiversity)
• Minimal grazing pressure (aimed at increased biodiversity)

3 replicates, plot size 1 ha, grazed with Simmental

Measurements and Calculations:

• Fodder on offer during grazing period, pasture performance
• Botanical composition and sward structure
• Excretion behaviour and distribution of nutrients
• Nutrient balances
• Stable isotopes in soil, vegetation and cattle switch hair
• Profitability of the grazing system