Recover from summer and gear up for fall
What is thatch, and why can it have a negative effect on water quality?
Thatch is the layer of dead and decomposing plant tissue that forms above the soil. A thin layer of thatch is beneficial to lawns. It will protect the crown of the plants and reduce soil compaction. Heavy thatch buildup results when the production of plant tissue exceeds the decomposition rate and can be encouraged by excessive growth in the spring. Fertilizers and nutrients are ineffective when water and materials cannot penetrate the thatch layer. Localized dry spots appear when the thatch becomes water-repellant and runoff increases.
|What is compaction, and why can it have a
negative effect on water quality?
Compaction is a physical condition in which soil particles are crushed together and oxygen levels in the soil are reduced. It usually occurs in areas of high traffic or near impervious surfaces (pavement). Water infiltration and percolation are poor, and soils remain wet longer.
The lawn is perforated during
The plants respond with reduced root and shoot growth as well as reduced water and nutrient uptake.
As the turfgrass thins, the risk of surface runoff from bare areas increases. This is common on heavy clay soils or soils that receive traffic such as athletic fields.
What is core aeration, and how can it have a positive effect on water quality?
Core aeration, which should be done in late August, punches holes in the lawn and pulls out cores. The holes increase infiltration of water, nutrients, and air into the soil. Core aeration should be
performed as temperatures cool and soil moisture is adequate. Allow cores to dry on the surface, then break up with a rake and distribute evenly over the lawn as a topdressing. Be careful not to move soil particles off site because they contain phosphorus, which is a leading threat to water quality in many parts of the country.