Overseeding TRF 230. Why Overseed Bermuda goes dormant Green color Traffic tolerance Economic...
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Transcript of Overseeding TRF 230. Why Overseed Bermuda goes dormant Green color Traffic tolerance Economic...
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Overseeding
TRF 230
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Why Overseed
• Bermuda goes dormant
• Green color
• Traffic tolerance
• Economic reasons
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Overseeding Myths
• Drainage improves
• Protects from winter kill
• No effect on Spring Transition
• Reduces weed populations
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Factors Influencing a Good Overseeding
• Timing
• Seedbed Preparation
• Grass Selection
• Seed Quality
• Seeding Rate
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Timing
• Too early: disease and bermuda competition
• Too late: Poor germination rates due to low temps
• Night temps in the 50’s• Soil temps at 4 inch depth low 70’s• Cool season turf favored by temps
between 50 and 70 degrees• 20-30 days before first killing frost
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Seed Bed Preparation
• Year long process
• Purchasing seed and seed selection
• Over seeding schedule
• Healthy bermuda grass base
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Seed Bed PreparationGreens and Tees
Three to six weeks before overseeding • Nitrogen fertilization reduced or stopped to
reduce bermuda competition • Soil cultivation be sure to allow time for
recovery• Vertical mowing to reduce thatch and open
soil surface• Topdressing• Apply P and K (get a soil test)
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Seed Bed PreparationGreens and Tees
Ten to 14 days
• Reduce mowing height
• Light vertical mowing to enhance seed moving through canopy
• Clean debris
• Irrigate good
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Seed Bed PreparationFairways
• Less intensive
• Close mowing
• Remove debris
• Correct thatch problems if they are a problem
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Grass Selection
• Perennial Rye grass larger seed• Poa trivialis smaller seed• Blends different cultivars of same speciecs• Mixtures different cultivars of different species• Budget• Intended quality• Planting date• Traffic or play intensity
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Grass Selection
Select a blend or mixture to customize your overseeding to meet your requirements
• Green color, texture, density• Establishment rate, winter and spring
performance• Spring transition, wear and shade tolerance • Putting quality, competitiveness with Poa annua• Disease resistance
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Seed Quality
• Blue Tag Certified Seed
• Percent purity
• Free of hard to control weed seeds
• Acceptable germination rates
• Fungicide treated seed
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Seeding Rate
Depends on seed size, area and use
• Too low thin stand of grass and large plants
• Too high weak stand that is disease prone
• Perennial Ryegrass 25-40 Lbs per M for greens 250-450 Lbs per acre
• Poa trivialis 8-12 Lbs per M for greens
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Overseeding ProcessGreens
• Varies by superintendent and situation• Apply seed when surface is dry• Wind speed less than 5 mph• Carefully calibrated spreaders 2 different
directions• Protect boundaries• Light topdressing• Drag seed in with carpet
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Overseeding ProcessFairways
• Seed in two different directions
• Mat or drag in seed
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Post Planting Care
• Light and shallow irrigation careful not to puddle water
• Brush seed back in place that gets moved by water
• Reduce irrigation as grass gets established
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Post Planting Care
Disease Management
• Pythium and Brown patch
• Apply fungicide 5-7 days after planting
These diseases are favored by:
• Warm weather
• Long periods of moisture on the leaf
• High seeding rates
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Post Planting Care
Mowing
• Start out at ½ inch and gradually lower by 1/32 to ¼ inch in 2 to 3 weeks
• 4-6 weeks until reach 3/16
• Use sharp mower
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Post Planting Care
• No Nitrogen until bermuda has stopped growing
• 2 to 3 weeks after seedlings have emerged
• ¼ to ½ Lbs of Nitrogen every 2 to 3 weeks
• Minimize traffic
For winter management proper fertilization and irrigation ½ lbs of N every 2-3 weeks