Is red soil acidic or alkaline, and is red soil acidic or alkaline?

In the high temperature and rainy zone in the south, the organic matter in the soil decomposes at high temperature, and is leached by rainwater, leaving a large number of aluminosilicate clay particles and a large amount of red iron oxide in the soil, so the formation of red and yellow soil, the acidity of the soil reaches pH3, which is a strong acidic soil.

Red clay is acidic soilIt has very good air permeability and very loose soil. When cultivating plants, they will not be as easy to harden as alkaline soil, which is very helpful for the growth of plant roots. The water retention of this kind of soil is generally very good, and the compressibility is also very low, and it is easy to spread out after being pinched by hand.

Common ones are jasmine and gardenia.

Oleander, rhododendron, smiling flower, camellia.

These plants can be planted in red soil, and they are afraid to grow in alkaline soil.

Characteristics of the formation of red soil

1) Strong weathering of primary minerals: In the composition of sand minerals, the more feldspar content, the weaker the weathering. Conversely, the more weathered.

2) High weathering leaching solubility: red soil has different formation ages and parent materials, and its corresponding silica.

Calcium oxide, aluminum oxide.

and so on. In addition, the older the formation age of the red soil, the stronger the weathering leaching solubility.

3) High degree of free iron: red soil releases a large amount of free iron and manganese during geochemical weathering, which becomes iron and manganese hydrated oxides. Under obvious alternating wet and dry climates, free iron crystallizes into hematite after dehydration.

Dye the weathered shell red.

In the process of leaching and deposition, a part of the free iron and manganese is deposited on the soil structure to form an iron-manganese adhesive film (mainly ironized), and a part of the free iron and manganese is concentrated to form an iron-manganese nodule.

The difference between acidic soil and alkaline soil is that the soil color is different, the texture is different, the situation after watering is different, and the feel is different.

1. The soil color is different.

Acidic soils are generally darker in color and mostly black-brown, while alkaline soils are mostly light-colored in color such as white and yellow. In some saline-alkali areas, there is often a layer of alkaline white powder on the soil surface.

2. The texture is different.

Acidic soil is loose in texture, with strong air permeability; Alkaline soil is hard, easy to form lumps, and has poor aeration and water permeability.

3. The situation after watering is different.

After watering, acidic soil infiltrates quickly, does not bubble white, and the water surface is muddy; After watering the alkaline soil, the infiltration is slower, the water surface bubbles white, foams, and sometimes there is a layer of white alkaline material around the pot.

4. The feel is different.

Acidic soil has a "soft" feeling in the hand, and after letting go, the soil is easy to spread out and not easy to agglomerate; Alkaline soil has a "hard" feeling in the hand, and it is easy to agglomerate and not fall apart after letting go.

Elm trees prefer acidic or alkaline.