Red clay soil — categorized as “Ultisol” in the U.S. Department of Agriculture’s grouping of 12 broad types of soil in the country — gets its color from oxidized iron, otherwise known as ...
That is, unless Isner has decided that maybe red clay suits him better. This is an extremely pleasant emerging story for the down-at-the-heels American tennis establishment. It's also an unexpected ...
Sandy soil is pale coloured and has large particles. These create lots of small air gaps. Water drains through them easily so it usually feels dry. Clay soil is usually sticky and has small particles.