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Look at the color of the soil. Fertile fields are dark and light in color.
Two to see the earth cracks. Fertile cracks are short and shallow, thin and numerous, and thin fields are cracked and deep.
Look at water retention ability. Fertile land, water, irrigation can maintain a water for 6 to 7 days, thin field water retention capacity is poor.
Look at the night tide phenomenon. Fertility night tide phenomenon is more obvious, dry and wet, not easy to dry sun hard; thin field no night tide phenomenon, easy to dry sun hard.
Five to see the water quality. After the fertilizer is applied to the water, the water is creamy and sticky. When the sun is shining or people walk around, it will bubble; when the skinny goes water, the water is light and colorless, and when the sun or people walk around, there are usually no bubbles or small bubbles.
Six to see the indicator plants. Fertilizer fields have algae, goosegrass, valerian, leeks, and setaria; slender fields usually have cow felt, duckweed, wild pheasant, three-edge grass, wild mushroom, and field pu and so on.
Seven to see the instructions animal. There are snails, cockroaches, and big ants in the field.
Identifying soil fertility with "seven sees"
In the absence of soil analyzers in rural areas, soil fertility can also be identified through observation. There are seven main observations: