Liming grazed grassland

Soil pH is a key factor in the vitality of microbial life and the fertility of grazed grassland. Natural acidification caused by rain, the mineralisation of organic matter and nitrogen fertilisers reduces nutrient availability and increases the toxicity of aluminium and manganese. Regular liming counteracts this effect, improves fertility, promotes a balanced mix of grasses and legumes, and maintains the productivity of permanent grassland. A pH above 6 favours the dactyl-lucerne mixture, whilst a pH below 5.5 leads to structural deterioration and the presence of Rumex acetosella.