The type of farming system used affects the chemical properties of soil. Organic farming, which uses natural fertilizers, increases soil humus, organic carbon, and micronutrients. Conventional farming can make soil more acidic with high mineral fertilization. Different crops also change soil chemistry. A study in Poland compared organic and conventional farming on loess soil. They grew the same crops in both systems: potato, winter wheat, field bean, and spring barley. Over four years, organic farming increased soil magnesium, boron, copper, manganese, zinc, organic carbon, and total nitrogen. It also improved soil pH, humus content, and total sorption capacity. Organic farming had more nitrogen in the form of N-NH4 and less in the form of N-NO3.