Why are sandy soils generally less fertile than clayey soils?

Answer 1

All things being equal (which, of course, they never are), sandy soil will feel drier than clay soil because sand provides better drainage, mainly because it far more porous than clay. Clay is dense, less porous than sand, and acts somewhat like a sponge. actually

sand is less porous then clay but other then that the above answer is fine. clay has a better ability to retain water like a sponge.

Answer 2

Clay soils are much thicker and have a higher water-holding capacity, which means that water cannot drain throught it faster. However, Clay soils have much more humus in it. Sandy soils let water drain through fast and have rarely any minerals and humus.

Answer 3

Sandy soils are comprised of larger (and fewer) solid particles than clayey soils. These particles are irregularly shaped and so "fit" together in a way that creates spaces between particles. More particles = more space, especially when you consider the difference in particle sizes we are talking about here. Sand > 50 micrometers. Clay < 2 micrometers (USDA classification system). More space results in lower bulk density.

Answer 4

Sandy soils are generally less fertile than clay soils because they do not hold water as well as clay soils. Clay soils are usually fertile and hold more nutrients than sandy soils.

Answer 5

Loamy soil has a higher clay content, and usually is easier to maintain organic matter content.