How do you know the soil is fat and thin?

How do you know the soil is fat and thin? Please introduce how to know how to distinguish between fat and thin soil by referring to the following methods: look at the color of the soil. The color of fertile soil is darker, while that of lean soil is lighter. Second, look at the depth of the soil. The fertile soil layer is generally more than 60 cm, while the lean soil is relatively shallow. Third, look at the tillability of the soil. The fertile soil is loose and easy to cultivate; the clay plough in the lean soil layer is laborious. Fourth, look at the sedimentation and cracks of the soil. Fertile soil is not easy to starch, soil cracks are many and small; lean soil is very easy to starch, easy to consolidate, soil cracks are few and large. Fifth, look at the soil water retention capacity. The infiltration of water is slow, and the soil that can be kept by irrigation for 6-7 days is fertile soil, and the soil that does not infiltrate or seeps quickly along the crack is lean soil. Sixth, look at the water quality. Slippery water, sticky feet, big bubbles in sunshine or stepping on feet are fertile soil; the water quality is light and colorless, the paddy field does not have bubbles, or the bubbles are small and easy to disperse for lean soil. Look at the phenomenon of night tide. There is night tide, dry and wet, it is not easy to dry and hard for the fertile soil; there is no night tide phenomenon, the soil hardening is lean soil. Eighth, look at the ability to keep fat. The soil with strong fertility, sufficient and long-term supply, or potentially fertile soil belongs to fertile soil. Nine, look at the plants. The soil for the growth of red head sauce, goose feather grass, shepherd grass and so on is fertile soil; the soil of long cow hair grass, duck tongue grass, trigonous grass, wild orchid, wild onion and so on is lean soil. Ten look at animals. The soil with snail, Loach, earthworm and leeches is fertile soil, while the soil with small ants and big ants is mostly lean soil. Click to get more compound fertilizer application techniques