Two days ago, when chatting with an old farmer, I heard the old farmer say such a sentence: "Sand does not bury graves, and red soil is difficult to raise people." Because this sentence is somewhat obscure, although I have been thinking about this sentence for a long time, I still cannot think of the meaning of this sentence, so I have to ask the old farmer for advice, and the old farmer tells me that the meaning of this sentence is like this:
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The so-called "sandy soil" actually refers to a kind of soil made of a mixture of more than 80% sand and less than 20% clay. The formation of sand is often due to nature. For example, the wind blowing sand dunes or the river scouring and wrapping can make the soil "desertification".
In general, sandy land is not suitable for growing crops. The main reason is that the water retention and fertilizer retention capacity of this soil is too poor, and rainwater and fertilizer are very easy to penetrate into the ground through the gap between sand and sand, so that crops cannot absorb enough water and nutrients from shallow soil, so sand land is jokingly called "dispensable low-yield field" by the people.
Sandy land is not enough to grow crops, but why can't it be used for burial?
1. The soil of the sandy land is very loose, and the burial chamber is easy to collapse
Sandy soil belongs to the "loose soil structure", and there are certain pores between sand and sand, so the load-bearing performance is very poor. If a tomb is dug on sandy ground, it will not be long before the tomb collapses. Once the tomb collapses, it is bound to damage the coffin of the deceased relative, which will make future generations feel guilty.
2, the soil of the sandy land is very easy to seep water, resulting in the coffin of the loved one being soaked in water
As we have already said above, the soil retention capacity of sandy land is very poor, which means that rainwater is very easy to penetrate into the ground. And once the rain seeps into the ground, it will definitely cause the coffins of relatives to be soaked by the rain, which will make future generations uneasy.
It is for the above two reasons that the ancients believed that sandy land is not suitable for burial.
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Laterite is a type of soil that develops under tropical and subtropical rainforest or evergreen broad-leaved forest vegetation, which is mainly formed by the weathering of carbonates or rocks containing other iron-rich aluminum oxides in hot and humid climates.
According to studies, laterite contains more metal compounds, the most mainly including iron compounds and aluminum compounds. When the laterite is washed by rain, iron oxides and alumina will crystallize, and will also appear in the form of "granular", "granular" internal structure is tight, "granular" and "granular", the structure is loose.
In general, the permeability of laterite is very poor, which is very unfavorable to the respiration of plant underground roots, and at the same time, due to the small mineral nutrients in laterite, great acidity, easy to produce aluminum and manganese and other poisons, therefore, it is very unsuitable for growing crops.
According to the test, the cultivation of corn on the same area of loam soil and red soil, with the application of the same amount of fertilizer, if 1,000 kg of corn can be harvested on the yellow loam land, then only 300 kg of corn can be harvested on the red soil. It can be seen that the soil quality of the red soil is very poor.
Since the soil quality of the red soil is very poor, it is difficult to rely solely on the red soil to feed human beings without enough red soil. It is precisely because of this that the ancients believed that the red soil was difficult to feed human beings.
The above is the general meaning of this sentence.
After listening to the old farmer's explanation, I finally understood the meaning of the sentence "Sand does not bury graves, and red soil is difficult to raise people" to express. It can be seen from this that the working people have summed up a lot of experience from their long-term life and production practice!