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Turfgrass Soils

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Information about Turfgrass Soils
Education

Published on September 9, 2008

Author: gooseunl

Source: authorstream.com

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Turfgrass Soils:  Turfgrass Soils Think Turf?:  Think Turf? Functions of Soil:  Functions of Soil support provides nutrition for plants retains moisture Soils have 3 phases:  Soils have 3 phases solid liquid air Components of soil:  Components of soil Organic Matter (5%) Air (25%) Water (25%) Minerals (45%) Soil Pores:  Soil Pores water-filled holes size affects water availability provides soil solution air-filled holes not continuous RH at 100% high CO2 (>300x that of air) low O2 (10-12%) Soil texture = size range of particles in the soil:  Soil texture = size range of particles in the soil qualitative = “feel” quantitative = particle size analysis USDA Soil Textural Classes:  USDA Soil Textural Classes Very Coarse Sand 2.00 - 1.00 Coarse Sand 1.00 - 0.50 Medium Sand 0.50 - 0.25 Fine Sand 0.25 - 0.10 Very Fine Sand 0.10 - 0.05 Silt 0.05 - 0.002 Clay <0.002 diameter (mm) Slide9:  % Sand 0 % Clay % Silt 100 100 0 0 100 Sand Clay Silt Loam Quantitative measurements of soil structure :  Quantitative measurements of soil structure Bulk density = weight of a volume of dry soil ex. how much does 1 cm3 of soil weigh ?? Particle density = weight of the solids volume of the solids Why are these terms important ??:  Why are these terms important ?? Bulk density - determines the porosity of the soil soils that are loose and porous have low weights per volume soils that are packed have high weights per volume As a general rule, turfgrasses will always perform better in soils with low bulk density than soils with a high bulk density:  As a general rule, turfgrasses will always perform better in soils with low bulk density than soils with a high bulk density The 3 secrets of growing good turf:  The 3 secrets of growing good turf drainage ! drainage ! drainage ! Adequate drainage for turfed surfaces can be achieved by::  Adequate drainage for turfed surfaces can be achieved by: surface drainage subsurface drainage both is ideal Slide15:  Surface Subsurface Slide16:  Coarse Layer (large pores) Less Coarse Layer (smaller pores) Drainage is promoted Soil Texture and Drainage are Interconnected Slide17:  Coarse Layer (large pores) Less Coarse Layer (smaller pores) A “Perched” Water Table Occurs Soil Texture and Drainage are Interconnected Where do you find perched water tables ???:  Where do you find perched water tables ??? USGA Putting Greens Precision Athletic Turf Sports Fields Fragipan soils Shallow soils over rock Slide19:  The USGA Rootzone When is surface drainage important ??:  When is surface drainage important ?? always high-traffic areas with soil growing zones sports fields where play must continue general rule of thumb for adequate slope is 1-2% Slide21:  12-18” 160 ft. drain tile Native Soil Football Field (crown dimensions) Slide22:  Wet soils are easily compacted Slide23:  Herringbone drainage system under a crowned sports field Slide24:  6-12” 160 - 225 ft. drain tile Native Soil Soccer Field (crown dimensions) Slide25:  6-12” 160 ft. drain tile Sand-Based Football Field (crown dimensions) * superior internal drainage reduces the need for a high crown

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