What are the dangers of acidic soil, and how to improve acidic soil?

Acidic soil is a general term for soil with a pH value less than 7. Various red or yellow acidic soils are widely distributed in tropical and subtropical regions of my country.

This article introduces the dangers of acidic soil, as well as how to improve acidic soil and other issues for reference.

1. What are the hazards of acidic soil?

Soil acidification reduces the number of beneficial microorganisms in the soil and inhibits the growth and activity of beneficial microorganisms, thereby affecting the decomposition of soil organic matter and the nitrogen and phosphorus in the soil. , potassium, sulfur and other elements cycle.

Soil acidification will also cause the breeding of pathogens and increase root diseases. For example, soil acidification will aggravate the breeding and spread of root nematodes in crops.

Soil acidification will cause the fixation of nutrients. For example, when the soil pH value is lower than 6, the fixation rate of phosphorus in red soil will rise linearly as the pH value decreases, becoming a factor affecting agricultural development. One of the serious problems.

2. How to improve acidic soil

Soil acidification can use chemicals to adjust the pH value of the soil, such as applying some alkaline products to reduce soil acidity through neutralization reactions, alkaline chemicals You can choose quicklime, alkali residue, calcium chloride, etc.

You can also add fully decomposed organic fertilizer to the soil. Organic fertilizer contains a large amount of organic matter and has great buffering properties. It can adjust the acidity and alkalinity of the soil and improve the soil environment.

3. Should quicklime or hydrated lime be used to improve acidic soil?

Hydrated lime is generally used to improve soil.

Hydrated lime is alkaline, and the effect of improving acidic soil will be more obvious. Generally, lime is used more as a material to improve acidic soil, and there are many ways to use it.

Hydrated lime can react with h+ (hydrogen ions) to neutralize the acidity of the soil, while quicklime does not have this effect.

Because quicklime needs to react with water when improving the soil, it will still turn into hydrated lime after the reaction. Although the properties are the same, the effect is not as good.

IV. Advantages of using hydrated lime to improve soil. The main component of hydrated lime is calcium hydroxide. Calcium hydroxide can not only improve the acidity of the soil, but also provide calcium and increase soil nutrition.

Excess calcium hydroxide will not cause harm to the soil because it can automatically absorb carbon dioxide in the air to generate neutral calcium carbonate.

After calcium carbonate is mixed with soil, it can retain fertilizer, water, and breathability, thereby making the soil fluffy and suitable for plant growth.