Components of shifting
There is a special field of ecology that deals with the quantitative and qualitative composition of vegetation depending on the habitat; called phytosociology. The type of soil can be determined on the basis of the species composition of plants living in a given area, water relations and climatic conditions of a given environment. Every grassland consists of grasses, clover and other herbaceous plants, and forests mainly of various trees and shrubs. There is a close harmony in the life and development of these plant communities. The underground part of the plant is closely related to the soil and the organisms living in it. The aboveground part, on the other hand, is surrounded by air, light reaches her, heat and water, has contact with microorganisms and insects, birds and other animals. The interaction of these factors in the entire area produces characteristic habitat features. Agriculture interferes with these natural structures and destroys the interaction of plants, introducing single-species crops that occupy a large area of land. All other plants, that grow between crops, are considered weeds. There is no doubt, that this way of growing has many advantages. By the way, it was noticed, that species growing side by side in natural conditions grow well one after another. This gave rise to a plant rotation.
It is important to know the nutritional requirements of the various species grown in the garden. On this basis, they can be divided into three groups.
The first are plants with high nutritional requirements. These include the tomato, cucumber, cruciferous, seler, leek and lettuce. These plants need a lot of fertilization. Kohlrabi is one of the plants with medium nutritional requirements, onions, carrot, beetroot, scorzonera, chicory, radish, radish, lamb's lettuce and spice plants. These plants are grown after the plants of the first group, use fertilizers, what are left in the soil.
After them, you can grow plants with low nutritional requirements. They are mainly legume plants, which have the ability to bind free nitrogen from the air and to recycle phosphorus immobilized in the soil. The principle of such a three-membered crop rotation is the cultivation of related species in the same field at the earliest 3 years. With more frequent consequences, and also in monoculture, soil fatigue is observed, accumulation of pathogens and plant pests in the soil.