What is a soil triangle used for?

The soil triangle is a useful tool for determining soil texture by visualizing the proportions of sand, silt, and clay in a given soil sample. When soil samples are analyzed for their composition, the percentages of each of these components are plotted on the soil triangle, which helps in identifying the specific type of soil based on its texture classification.

Understanding soil texture is crucial for various agronomic practices as it influences water retention, drainage, nutrient availability, and suitability for different crops. As such, option B accurately reflects the primary use of the soil triangle, which is to ascertain soil composition by percentage, enabling farmers and agronomists to make informed decisions regarding soil management and crop selection.