To identify the soil type with the greatest water retention capacity, we must examine the properties of each listed soil:
- Sandy soil: Characterized by large particles and minimal cohesion, it exhibits poor water retention as water rapidly percolates through it.
- Loamy soil: A balanced composition of sand, silt, and clay, loamy soil offers moderate water retention.
- Sandy silt soil: Possessing larger particles than clay, it allows for improved drainage but retains less water compared to clay-dominant soils.
- Clayey soil: Composed of extremely fine particles, this soil is highly plastic and cohesive. Its ability to compact tightly and the minuscule pore spaces between its fine particles result in superior water retention.
Based on these characteristics, clayey soil demonstrates the highest water retention capacity. Its fine texture minimizes water escape, enabling it to hold more water than the other soil types.
Consequently, the accurate identification is: Clayey soil