There are deep soil layers and shallow soil layers. Deep soil layers are raw soil, and shallow soil layers are cultivated soil, also called loam. Careful observation shows that the raw soil in the deep soil layer is an independent soil aggregate structure, while the cooked soil in the shallow soil layer is an aggregate structure. It is humus organic matter in soil that can combine many soil particles and separate them. The aggregate structure in soil is rich in humus organic matter, and the roots of crops can only grow healthily if they extend into it, because the soil is fertile. The soil accumulated in deep soil has no humus, and the content of organic matter is extremely low, and many soil particles are not in aggregate structure. Crops planted in this soil grow short and yellow because of the extremely low organic matter content in the raw soil.
The condition of soil aggregate structure is that there must be a lot of humus, which can differentiate into organic matter for various reasons and condense soil particles into aggregate structure. One of the reasons is the advantage of earthworm. Its food is humus, which eats humus and soil particles in the cavity and discharges condensed soil aggregates after digestion. Earthworms are one of the reasons for soil aggregate structure. There are many earthworms in the soil, and the aggregates in the soil structure are rich, and the soil quality is more fertile than the soil with fewer earthworms. Therefore, the land with earthworms is fertile and good.
Earthworms are reptiles and like to live in fertile soil. They usually make a living by absorbing nutrients from soil fertilizers. Their main function is to loosen the soil, make the roots of your vegetables grow luxuriantly, absorb a lot of water and nutrients in the soil, and achieve the purpose of rapid growth and increase its yield. However, earthworms also need living conditions. Compared with barren land, they seldom stay. As we all know, earthworms usually stay in the sewer in front of and behind the house, in fermented soil machine fertilizer, in vegetable fields compared with fertilizers, in loose and breathable ridges, and in fertile soil in ditches. Besides soil fertilizer, they also need enough water in the soil to promote their survival.