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TURF PHYSIOLOGY. Photosynthesis 2-ranked leaf arrangement Chlorophyll gives green color Photosynthesis is process of using light to create carbohydrates.

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Presentation on theme: "TURF PHYSIOLOGY. Photosynthesis 2-ranked leaf arrangement Chlorophyll gives green color Photosynthesis is process of using light to create carbohydrates."— Presentation transcript:

1 TURF PHYSIOLOGY

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 conditionsFavorable conditions High mowing heightHigh mowing height Adequate NAdequate 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

6 COOL-SEASON VS. WARM- SEASON TURFGRASSES Cool-season turfgrass Spring and fall are favorableSpring and fall are favorable 65 to 75 F 65 to 75 F Semi-dormant in winterSemi-dormant in winter C3 plants (# of carbon atoms in PS)C3 plants (# of carbon atoms in PS) 12 to 18” roots12 to 18” roots

7 COOL-SEASON VS. WARM- SEASON SPECIES Warm-season turfgrass SummerSummer 80 to 95 F80 to 95 F Semi to dormant in winterSemi to dormant in winter Lose chlorophyll below 50 FLose chlorophyll below 50 F C4 (# of carbon atoms in PS)C4 (# of carbon atoms in PS) 36” roots36” 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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