Emissie-evaluatie MJP-G 2000; Achtergronden en berekeningen van emissies van gewasbeschermingsmiddelen

The long-term crop protection programme (MJP-G) of the Netherlands aimed for the period 1990 - 2000 a.o. at 50 to 90 % reduction of emissions of plant protection products to the environment. The success of the emission reduction part of this plan was evaluated by calculating emissions to air, surface water, soil and groundwater for the reference period and the year 2000. Reductions were estimated to be 79 % (aim: at least 75 %) for emissions to soil and groundwater, 54 % (aim: at least 50 %) for emissions to air and 79 % (aim: at least 90 %) for emissions to surface water. The emissions to air constitute over 95% of total emitted amounts. This report presents technical backgrounds, boundary conditions and calculation methods. As compared to the interim evaluation in 1995, several calculations methods have changed significantly. For the calculation of emissions to air, new information has become available so that it is now possible to account for direct emission of droplets to air and interactions of the plant protection products with soil and crop. The leaching and drainage is calculated directly for the most important substances, while in the interim evaluation an overall distribution was calculated. Drift to surface water and non-target areas is now based on an extended database on drift measurements and includes drift reduction measures. Emissions for the reference period and for 1995 have been recalculated with the new calculation procedures to make a proper evaluation of the reduction percentages possible