Alkaline soil

Alkaline soil is a type of soil that has a high pH value, usually due to the presence of sodium, calcium and magnesium carbonates. It is one of the many types of soil that exist in the world, each with its own unique set of characteristics and suitability for different types of plants and crops.

Characteristics

Alkaline soils are characterized by a pH value above 7.0, which is considered neutral on the pH scale. They are often rich in carbonates, especially those of sodium, calcium and magnesium. These soils can be identified by their hard, compact nature in dry conditions, and a soapy or slippery feel when wet due to the high sodium content.

Formation

Alkaline soils are formed through a process known as alkalization. This occurs when there is a high rate of evaporation and low rainfall, causing the water in the soil to move upwards. As the water evaporates, it leaves behind salts that increase the soil's alkalinity.

Effects on Plant Growth

The high pH of alkaline soil can have a significant impact on plant growth. Many nutrients, such as iron, manganese, and zinc, become less available to plants in alkaline conditions. This can lead to nutrient deficiencies and poor plant growth. However, some plants have adapted to thrive in these conditions, such as the saltbush and blue grama grass.

Management

Managing alkaline soils can be challenging but is necessary for successful agriculture. This often involves the addition of organic matter, such as compost or manure, to increase the soil's acidity and improve its structure. In some cases, sulfur or sulfuric acid may be added to lower the soil's pH.

See Also

• Acidic soil
• Soil pH
• Soil fertility
• Soil types