International Journal of Digital Earth The International Journal of Digital Earth, jointly published by Taylor & Francis Group, is the official academic publication of the International Society for Digital Earth.
The soil texture triangle is one of the tools that soil scientists use to visualize and understand the meaning of soil texture names. The textural triangle is a diagram which shows how each of these 12 textures is classified based on the percent of sand, silt, and clay in each. Note: these percentages are based on the USDA definition of sand and silt only. Follow these steps to determine the textural class name of your soil sample: 1) Determine the percent sand of your sample and find that number on the bottom of the triangle. Note that the numbers read from right to left, not left to right.
contents form a smooth curve, called the compaction curve, which is used to obtain the optimum. water content and maximum dry density. The two standardized tests in use today, the standard. and modified Proctor tests, differ only by the amount of compactive energy. In practice, the. standard or modified Proctor test is conducted on a soil and specifications are written stating: 1) that the soil moisture content during compaction should be within a specified percent of the. optimum water content; and 2) that the dry density of the compacted soil should be 90 to 100.