DLG and official forestal forestry bodies in the federal state of Baden-Wurttemberg developed testing regulations together with the Freiburg Research Institute (FVA) and a number of lime producers. This regulation ensures that only tested lime will be spread over the forests in this federal state.
The DLG quality seal gives peace of mind, because it involves audits, frequent samplings by qualified manufacturer staff and unbiased external staff. The products leave the production site only after they have passed the lab tests.
The products used for the forests in southern Germany are mixes from dolomites dolomite lime and dolomite wood ash. Depending on the product, the following parameters are routinely tested:
- Moisture level
- pH value
- Nutrient levels
- Pollutant levels
Before the raw materials dolomite and wood ash are processed they are subjected to a recognition analysis which focuses on the analysis of pollutants. This procedure offers synergy effects for those producers who form part of DLG quality seal programme. Dolomiten bereits die Anforderungen.
The wood ash that is supplied to the producer is systematically sampled on arrival, the focus being again on pollutant control.
Before the finished mixes leave the plant they are consistently sampled for nutrient and screening sieving levels. These checks are carried out at short intervals and at varying intensities. A basic analysis will test the material for critical ingredients. A comprehensive analysis will also probe also for pollutants.