In general, however, the supply of these ecosystem services is undersupplied by farmers. Organic farming practices can also bring benefits to water quality, such as not using synthetic pesticides, as well as providing other ecosystem services, for example, carbon sequestration and enhanced biodiversity (Greene etal., Farm comparisons with conventional farming show that actual nitrogen leaching rates per hectare can be up to almost 60% lower on organic than on conventional fields, but leaching rates per kilogram of output were similar or slightly higher. Critical areas that can lead to higher nitrate leaching in organic farming are, for example: ploughing legumes at the wrong time, the selection of unfavourable crops planted in a rotation, and composting farmyard manure on unpaved surfaces (Stolze et al.,