The Kwatrijn concept makes it possible to close nutrient cycles and to meet a large part of the company’s protein requirements. The use of solid manure is ideal for soil life and soil fertility, the liquid manure stimulates optimum crop growth. Fertilizer is hardly needed anymore. Grass clover, herb-rich grass mixtures and own grain cultivation mean that less concentrates and straw (for in the stable) have to be purchased. Hay from the nature parcels can be used for the young stable stock.