Jackson Reid
Golf course managers are often faced with the challenge of maintaining greens that are both firm and fast. Firmness and speed are interconnected, with firmer surfaces resulting in faster play. However, it is a delicate balance, as the surface must also be soft enough to accept a well-struck golf ball. This balance can be achieved through various methods, including managing organic matter content, topdressing, mowing techniques, and drainage solutions. The goal is to create a consistent playing experience, with each green and all areas of each green providing the same playing conditions. Achieving this consistency requires a deep understanding of the biological and environmental factors influencing the greens, as well as a commitment to a rigorous maintenance program.
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What You'll Learn
- Mowing heights: Mowing too low can cause wheel marks and reduce smoothness
- Turfgrass growth: Rolling effects are temporary during active growth periods
- Topdressing: Use native soil or sand to improve speed and discourage thatch
- Grass type: Creeping bentgrass is best for premium greens, but Bermudagrass is good for hot climates
- Soil analysis: Test organic matter annually to avoid soft, wet greens
Mowing heights: Mowing too low can cause wheel marks and reduce smoothness
Mowing is the most critical cultural practice for achieving desirable turf. Mowing impacts turf quality, including texture, density, root development, colour, and wear tolerance. Turfgrasses cultivated on golf courses can be mowed near the ground, as their terminal growing points (crowns) are placed at or just beneath the soil surface.
However, mowing too low can cause wheel marks and reduce smoothness. Firstly, if the grass is mowed too low or irregularly, crown damage can occur, and extra photosynthetic tissue can be removed. This leads to off-coloured turf with reduced recuperative ability. Secondly, mowing height is directly related to root depth. As mowing height is reduced, root depth decreases. Golf greens with shallow roots require more frequent fertilisation and watering. Thirdly, grasses cultivated in shaded conditions will thin out if mowed too short, as they will not receive enough sunlight for photosynthesis.
To avoid these issues, it is important to maintain a minimum mowing height. The acceptable mowing height for a putting green varies depending on golfer expectations, amount of play, budget, climate, microclimates, and turfgrass species or variety. Generally, the acceptable range for cutting height for creeping bentgrass and mixtures of creeping bentgrass and annual bluegrass is 5/32 (0.156) to 3/16 (0.187) of an inch. Turfgrasses can be mowed closer in early spring, as they have an increased growth habit during this time.
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Turfgrass growth: Rolling effects are temporary during active growth periods
The growth of turfgrass is influenced by seasonal changes. During periods of active growth, the effects of rolling are temporary, whereas, during periods of minimal growth, rolling has more long-lasting effects. Rolling the lawn is believed to be an essential part of lawn maintenance, especially in the spring, as the grass is just coming out of dormancy and the roots are in active growth. However, it is recommended to not roll the lawn more than once a year, as it can compact the soil and damage the grass.
The use of rollers can lead to soil compaction, which can make it difficult for the grass to get the required water and air. Therefore, rolling is recommended only when the grass is actively growing, and the soil is moist. If the turf is wilted or dormant, rolling can cause severe stress and may even kill the grass.
Additionally, rolling should not be overused, as it can result in turf thinning and a significant reduction in quality. It is critical that rolled fields are regularly aerated to prevent compaction. Rolling is not suitable for fields with disease problems, especially infectious diseases.
In summary, while rolling can be beneficial for lawn maintenance, it should be done sparingly and under the right conditions to avoid negative consequences for the turfgrass.
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Topdressing: Use native soil or sand to improve speed and discourage thatch
Topdressing is a simple lawn care technique that can help improve the speed of your golf green and discourage thatch. It involves spreading a thin layer of organic material, such as native soil or sand, over your lawn to amend the soil.
To begin the topdressing process, remove any grass clippings, loosened thatch, or plugs of soil from the area you plan to topdress. Mow the grass as short as possible within its recommended height range. For example, the acceptable range for cutting height for creeping bentgrass is 0.156 to 0.187 of an inch.
When topdressing with native soil, spread a 1/8-inch layer of the same soil used in your green's foundation. Use a standard push broom to go over the surface and work the topdressing down into the turf. This will help keep your green firm, fast, and smooth.
Topdressing helps to improve soil quality by adding nutrients as your grass grows through the layer of topdressing. The organic material is incorporated into the soil, improving drainage and regulating carbon, nitrogen, and phosphorus levels. It also helps control diseases and breaks down thatch, allowing water to flow freely and nutrients to reach the roots.
It is recommended to topdress your home green at least twice a year, once in early May and again in late September. Golf courses often topdress more frequently, at three-week intervals.
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Grass type: Creeping bentgrass is best for premium greens, but Bermudagrass is good for hot climates
When it comes to selecting the right grass type for golf greens, the climate plays a crucial role. Creeping bentgrass, a cool-season grass, is widely regarded as the premium choice for golf greens, particularly in northern climates. Its finely textured blades allow golf balls to roll smoothly with less resistance, resulting in faster play. Creeping bentgrass also exhibits better heat tolerance, drought resistance, and disease resistance compared to other grasses. However, it requires optimisation of its growing environment, including ample direct sunlight, to maintain its quality.
In contrast, Bermudagrass is a warm-season grass that thrives in hot climates. It is native to tropical and subtropical regions and has excellent heat, drought, and salt tolerance. Bermudagrass can tolerate short mowing, making it ideal for golf courses, and its aggressive growth rate allows it to quickly recover from damage. However, its rapid growth also makes it challenging to contain. Bermudagrass establishes itself best during late spring and early summer, while creeping bentgrass is prime for establishment in late summer and early fall.
The choice between creeping bentgrass and Bermudagrass depends on the specific location and climate. Creeping bentgrass is ideal for northern climates and can provide a premium golfing experience with its smooth surface and low resistance to ball roll. Bermudagrass, on the other hand, is more suitable for hot, southern climates, where its heat and drought tolerance shine. While Bermudagrass may play slightly slower than bentgrass, its stiff, upright leaves still allow for good ball movement.
Both grass types require careful management and maintenance. Creeping bentgrass, for example, demands optimisation of its growing environment, including sufficient sunlight, to maintain its high performance. Bermudagrass, despite its resilience, requires full sun and good drainage to thrive and should be watered deeply and infrequently. Additionally, Bermudagrass may need mowing twice a week during its peak growing season due to its rapid growth.
In summary, for premium golf greens in cooler northern climates, creeping bentgrass is the preferred choice, while Bermudagrass is an excellent option for golf courses in hot, southern regions. Each grass type offers unique advantages and requires specific care to ensure optimal performance and golfer satisfaction.
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Soil analysis: Test organic matter annually to avoid soft, wet greens
Golf course maintenance is a complex and challenging task, and one of the key aspects is ensuring firm and fast greens. While various factors influence green speed and firmness, such as grass species, mowing height, and drainage, it's crucial to start with the foundation: the soil.
Soil analysis is a critical component of golf course management, and testing the organic matter content of the soil annually is essential to maintaining optimal conditions. Organic matter, specifically soil organic carbon (SOC), plays a pivotal role in the health and performance of the turfgrass. SOC contributes to the biological, chemical, and physical properties of the soil, enhancing water retention and structural stability. It also acts as a buffer, stabilizing the soil's pH.
By testing the SOC content annually, superintendents can make informed decisions about managing the greens. The test results indicate the amount of carbon remaining in the soil after the decomposition of organic material produced by living organisms. This information helps in several ways. Firstly, it guides adjustments to mowing heights and frequencies, as SOC impacts turfgrass growth and recovery. Secondly, understanding SOC levels aids in selecting the appropriate grass species for the specific soil conditions. For instance, creeping bentgrass, a cool-season grass, thrives in northern climates and is widely regarded as the best option for premium putting greens due to its finely textured blades that facilitate smooth and fast play. In contrast, hybrid Bermudagrasses are more suitable for hot southern climates, offering good ball movement with their stiff, upright leaves.
Additionally, SOC levels influence the frequency and effectiveness of topdressing applications. Topdressing, which involves applying a thin layer of native soil or sand, helps improve green speed and discourages thatch buildup. However, excessive thatch can negatively impact green speed and smoothness, so finding the right balance is crucial. By understanding the SOC content, superintendents can tailor their topdressing practices to meet the specific needs of the turfgrass and maintain the desired firmness and playability of the greens.
In summary, annual testing of organic matter, specifically SOC, is a powerful tool for golf course superintendents. It provides insights that help them make data-driven decisions about mowing, grass species selection, and topdressing practices. This proactive approach to course management ensures that golfers enjoy a consistent and high-quality playing surface, enhancing the overall golfing experience.
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Frequently asked questions
The firmness of a golf green refers to the hardness of the surface. The ideal green should be firm enough to promote speed, but soft enough to accept a well-struck golf shot. To achieve this, you should:
- Test the organic matter composition of your greens annually through a soil physical analysis.
- Manage organic matter levels—if they're too high, water retention increases, creating a soft surface.
- Improve drainage to reduce water retention and promote dryness.
- Mow the greens regularly—lower mowing heights tend to promote smoother, firmer surfaces.
- Use rollers to reduce the effects of active turfgrass growth and increase ball roll.
The mowing frequency depends on several factors, including golfer expectations, the amount of play, budget, climate, microclimates, and turfgrass species. Generally, the acceptable range for cutting height for creeping bentgrass is 0.156 to 0.187 of an inch.
Over the years, mowing heights for putting greens have decreased, with some courses mowing as low as 0.10 inches. However, the ideal height depends on the turfgrass species and can range from 0.10 to 0.25 inches.
Creeping bentgrass is widely considered the best for premium putting greens due to its finely textured blades that allow balls to roll easily. However, if you live in a hot, southern climate, hybrid Bermudagrasses may be a better option as they provide good ball movement with stiffer, upright leaves.
Maintaining the firmness of your golf greens requires regular maintenance and testing. Consider topdressing your greens with native soil or sand to improve speed and reduce thatch buildup. Additionally, ensure proper drainage to minimize disruptions in mowing frequencies caused by wet conditions.
