Gradually, the traffic of golf players´ feet and the daily passage of maintenance machines tend to compact the soil of the green. When the soil is compacted, these air bags are “crushed” and the roots run out of oxygen, so roots become weaker and, finally, wither and die.
Aerification is a mechanical process that creates more air space on the soil and benefits deep rooting, helping the lawn to stay healthy. In most cases, it´s done by removing a couple of centimeters from the compacted soil, allowing an injection of air and water that will produce a revival of growth. The spaces are filled with sand (topdressing) which helps the soil to retain air space and makes it easier for the roots to grow downward.
The benefits of hollow tinning: many!
The elimination of the thatch layer prevents that the thatch accumulates on the surface, what would dispose soft and slow greens and a retention of water on the surface; also favors and much, soil oxygenation and above all, the development of micro-organisms that benefit the growth of the turf; and finally, the hollow tinning facilitates good drainage and infiltration of water, as much from rain and as from irrigation.
So do not despair when you find a hollow tined green. The green recovery does not usually exceed two or three weeks of discomfort or even less, and is typically only done twice a year, to count with 48 weeks of perfect, firm and fast greens.