What is the basis for textural classification of soil?

The basis for textural classification of soil is primarily determined by particle size. Soil texture refers to the relative proportions of different-sized particles, which include sand, silt, and clay. These particle sizes significantly influence the soil's physical properties, such as drainage, aeration, and nutrient-holding capacity.

Understanding soil texture is essential for various agricultural practices because it affects how soil retains moisture and nutrients, as well as how well crops can grow. For instance, sandy soils drain quickly but may not retain sufficient nutrients, while clay soils retain water well but may have poor drainage.

Other factors like organic matter content, moisture content, and pH level also play important roles in soil quality and health, but they do not define the soil texture itself, which is strictly categorized based on the sizes of the soil particles. Thus, particle size is the correct basis for textural classification of soil.