Environmental Engineering Reference
In-Depth Information
other organic matter that is found between the soil surface and the grass
blades (Fig. 8.5). Its development indicates an imbalance between the
amount of organic matter produced by the turf-grass plants and the
rate of its decomposition. The major factors in thatch development
are growth rate and growth habit of the turf-grass in question, as well
as the maintenance of the turf area. In general, any turf-grass species that
spreads by above-ground stolons or below-ground rhizomes is likely to
produce thatch. For example, cynodon and zoysia (which both have
stolons and rhizomes) are prolific thatch producers. These species re-
spond actively to high fertilization, and under intensive levels of main-
tenance develop moderate to heavy thatch. In most turf situations, some
amount of thatch is desirable. A moderate layer decreases damage to
the area from excessive traffic. For example, highly trafficked turf areas
on football, rugby or hockey fields may greatly benefit from thatch, which
can also act as a valuable shock absorber where players frequently fall
on the field surface. Excessive thatch, however,
is disadvantageous.
The layer of thatch
Fig. 8.5. Thatch, a layer of living and dead grass stems, roots and other organic
matter, develops between the soil surface and the grass blades.
