SOIL

What is the main function of soil in environmental systems?

Soil connects the atmosphere, lithosphere, hydrosphere, and biosphere, supporting life on Earth.

What are the two types of minerals found in soil?

Primary minerals (same as parent material) and secondary minerals (formed from weathering of primary minerals).

Which type of soil particles retain more water, clay or sandy?

Clay retains more water due to its smaller particle size.

What is organic matter's contribution to soil composition?

Organic matter makes up 1% to 5% of soil and enriches it through decomposition.

Which gases are crucial for soil health?

Oxygen, carbon dioxide, and nitrogen are important for respiration and plant functions.

What is the significance of soil texture?

Soil texture affects water retention, aeration, and root growth capabilities.

What does the color of soil indicate?

Soil color can indicate composition, nutrient presence, and environmental conditions.

What does soil structure refer to?

Soil structure describes how soil particles bond to form aggregates affecting water retention and root growth.

What are soil horizons?

Soil horizons are layers of soil each with unique characteristics related to soil composition and history.

What is the O Horizon?

The O Horizon is rich in organic materials like dead plant and animal matter.

What role do microorganisms play in soil?

Microorganisms decompose organic matter, cycle nutrients, and support plant health.

How does water affect soil?

Water transports nutrients, facilitates chemical decomposition, and affects retention based on soil texture.

What is cation exchange capacity (CEC)?

CEC measures the ability of soil to hold and exchange positively charged ions (cations).

What is the effect of soil pH on plant growth?

Soil pH affects nutrient availability, soil properties, and overall plant growth.

What is the typical range of soil pH?

The typical soil pH range is between 4 and 10.

What can cause soil acidity?

Soil acidity can be caused by respiration of plants, organic matter mineralization, and natural precipitation.

What is the significance of the B Horizon?

The B Horizon is where minerals accumulate, including silicate clay and iron.

How do colloidal properties impact soil behavior?

Colloidal properties affect water and nutrient retention and exchange processes.

What is the process of adsorption in soil?

Adsorption is when substances accumulate on the surface of soil particles.

What is a primary characteristic of clay particles?

Clay particles have a high surface area, which enhances their ability to hold nutrients and water.

What does the presence of iron oxides in soil typically indicate?

Iron oxides can indicate soil drainage quality and nutrient availability.

How are organic colloids formed in soil?

Organic colloids are formed from decomposed organic matter, such as humus.

What occurs during the weathering of primary minerals?

Primary minerals break down to release important ions and form secondary minerals.

What is desorption in the context of soil?

Desorption is the process of releasing substances that were adsorbed or absorbed by soil.

What does sorption refer to?

Sorption encompasses both adsorption and absorption processes in soil.

What is the role of surface area in cation exchange?

Larger surface areas allow soil to hold and exchange more cations, affecting soil fertility.

What processes influence soil alkalinity?

Carbonate hydrolysis and mineral weathering primarily contribute to soil alkalinity.