Tifgreen in sand. Grass takes its oxygen through its roots and the roots will go down only as far as oxygen is available. The growth in sand lies upon two well understood scientific principles. Surface tension for our purposes - is the attraction of water to any wettable surface. Water in a glass always has a curve-up just as the water meets the glass.
Gravity empties the larger tubes.
The smaller tubes, having a greater ratio of surface per unit of water holds the water against the gravity. Construction of greens Leisure World, Ca. 10 months later. As the depth of the sand is increased, the upper levels hold progressively less water and therefore more air than the levels below. This invariably results in longer and stronger roots.