CRSS 2830 Lesson 11: Thatch. THATCH...a layer of partially decomposed and undecomposed plant tissue located at the soil surface....a layer of partially.

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Presentation transcript:

CRSS 2830 Lesson 11: Thatch

THATCH...a layer of partially decomposed and undecomposed plant tissue located at the soil surface....a layer of partially decomposed and undecomposed plant tissue located at the soil surface.

COMPOSITION OF THATCH stems (tillers, stolons, rhizomes, crown)stems (tillers, stolons, rhizomes, crown) rootsroots

THATCH ACCUMULATION...plant tissue accumulation occurs faster than plant tissue decomposition....plant tissue accumulation occurs faster than plant tissue decomposition.

THATCH ACCUMULATION MatMat –Plant tissue mixed with soil that occurs beneath thatch

DISADVANTAGES OF THATCH harbors insect and disease organismsharbors insect and disease organisms increased scalpingincreased scalping decreased tolerance to environmental stressesdecreased tolerance to environmental stresses

DISADVANTAGES OF THATCH sponge when wetsponge when wet repels water when very dryrepels water when very dry impedes water and chemical movement into soilimpedes water and chemical movement into soil

FACTORS AFFECTING THATCH ACCUMULATION rapid turfgrass growthrapid turfgrass growth decreased microbial activitydecreased microbial activity certain turfgrass speciescertain turfgrass species use of certain pesticidesuse of certain pesticides

CONTROLLING THATCH Mechanical removal (dethatchers)Mechanical removal (dethatchers) Core cultivation (hollow tine)Core cultivation (hollow tine) Topdressing (improves thatch environment via dilution)Topdressing (improves thatch environment via dilution) –A thin layer of soil spread over the surface of the turf then dragged or brushed into the thatch

DETHATCHING Warm season turfgrasses: late spring or early summerWarm season turfgrasses: late spring or early summer Cool season turfgrasses: late summer or early fallCool season turfgrasses: late summer or early fall