If you do not want chemicals in your body, do not put them in your food. For soils as peat and chernozem, regular application of organic fertilizers in addition to nitrogen, is most suitable. They contain microorganisms that can significantly increase soil fertility several times in a very short time. Humus is an organic component of the soil, which is the mail food of the plants. Fertility depends on the availability and guantity of this component. Rich soil contains from 8 to 12 % humus. Soil with a high content of nutrients has a dark color and is ideal.