What are the three primary soil particles in order from largest to smallest?

The correct order of the three primary soil particles from largest to smallest is sand, silt, and clay. Sand particles are the largest in size, typically ranging from 0.05 to 2 millimeters in diameter. This larger size allows sand to drain quickly and provides good aeration for plant roots.

Silt particles are intermediate in size, measuring between 0.002 and 0.05 millimeters. They possess better water retention properties compared to sand and can hold nutrients more effectively.

Clay particles are the smallest, with a diameter of less than 0.002 millimeters. Due to their small size, they pack tightly together, leading to higher water retention but lower drainage capacity. Clay is also crucial for nutrient exchange, as its surface carries a negative charge that attracts positively charged ions (cations) essential for plant growth.

Understanding the size and characteristics of these soil particles is fundamental in agriculture, as it affects water drainage, nutrient availability, and the overall health of the soil ecosystem.