QCM : Soil Fundamentals and Layers — 5 questions

Explication

The source describes soil horizons as distinct layers within the soil profile formed due to natural processes, but it does not attribute this concept to any specific individual. Therefore, the most accurate answer based on the source is that no specific individual is credited.

Explication

The classification of soil texture is primarily determined by the proportions of sand, silt, and clay particles in the soil, as explicitly stated in the source. These proportions influence water retention, drainage, and aeration, which are key features of soil texture.

Explication

Adding organic matter promotes soil aggregation, leading to the formation of stable peds, which improves water movement, aeration, and root penetration—key factors for healthy plant growth.

Explication

The correct answer is that soil pH measures the acidity or alkalinity of the soil, affecting chemical processes and nutrient availability, while NPK refers to the essential nutrients nitrogen, phosphorus, and potassium needed for plant growth, as explicitly described in the source.

Explication

The formation of soil horizons is mainly due to natural processes such as leaching, organic matter accumulation, and mineral deposition, which cause the development of layers with different properties over time, as stated in the source.