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Presentation on theme: "TURF PHYSIOLOGY."— Presentation transcript:


2 Photosynthesis 2-ranked leaf arrangement Chlorophyll gives green color
Photosynthesis is process of using light to create carbohydrates (food)

3 Carbohydrates (CHO) Excess CHO can be produced and stored
Favorable conditions High mowing height Adequate N

4 Carbohydrates (CHO) Lack of CHO available during temperature stress
High respiration Process of CHO consumption Lower CHO production

5 CLIMATE ZONES Cool season zones (humid and dry)
Warm season zones (humid and dry) Transition zone: too hot is summer, too cold in winter Zoysia and tall fescue

Cool-season turfgrass Spring and fall are favorable 65 to 75 F Semi-dormant in winter C3 plants (# of carbon atoms in PS) 12 to 18” roots

Warm-season turfgrass Summer 80 to 95 F Semi to dormant in winter Lose chlorophyll below 50 F C4 (# of carbon atoms in PS) 36” roots

8 MORPHOLOGY Shoots: aboveground parts Blade: upper part of leaf
Sheath: lower part of leaf Older leaves on outside, new leaves develop on the inside of sheath

9 MORPHOLOGY Meristem: region of cell division where growth occurs
Its location tolerates mowing

10 MORPHOLOGY Collar: blade growth occurs

11 MORPHOLOGY Crown: heart of the turfgrass plant Highly compressed nodes
Nodes: region of new growth

12 MORPHOLOGY All shoots and roots produced from crown

13 MORPHOLOGY Ligule: growth on inside of collar
Thin membrane or fringe of hairs, or both

14 MORPHOLOGY Auricles: appendages growing from the edges of collar

15 MORPHOLOGY Vernation: sheath orientation Rolled or folded

16 Turfgrass Cultivar Cultivar: short for “cultivated variety”
Differences within species that are bred Tolerances, color, texture, growth rate…

17 Non-Spreading Turf Bunch type: tillers are formed from crown
New plants develop from nodes on crown (daughter plants) Tight bunch of turfgrass plants

18 Non-Spreading Turf Bunch type: tillers are formed from crown
New plants develop from nodes on crown (daughter plants) Tight bunch of turfgrass plants

19 Spreading Turf Stoloniferous: crowns develop lateral stems that grow aboveground Nodes along stem capable of rooting and forming new plant

20 Spreading Turf Rhizomatous: lateral stems underground Large and white

21 ROOTING Highly fibrous Great ability to “mine” the soil
Low P fertilizers Roots are dependant on shoots for CHO Storage of excess CHO

22 ROOTING Over-irrigation reduces root system
Drier soils stimulate root growth High hormone production that slows shoot growth

23 ROOTING Mowing Reduces CHO production and root allocation

24 ROOTING Fertility Excessive N causes overgrowth of shoots and fewer roots

25 ROOTING Light Shade reduces CHO (PS) production, less goes to roots

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