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Autumn season trimming of northern cold season lawns
The cool-season turfgrass is known for its early greening in spring, delayed yellowing in fall, and extended green period, making it a popular choice for urban landscaping in northern China. However, this type of grass thrives in cooler climates. After enduring hot and humid summers, it becomes crucial to implement proper maintenance practices in the autumn to help the turf recover and maintain its health and appearance. This is a key challenge that groundskeepers must address.
One of the most important aspects of autumn care is watering. Northern regions often experience dry, windy, and arid conditions during this season, so timely irrigation is essential. Ideally, watering should be done every 5 to 7 days, preferably before 10 am or after 4 pm to avoid evaporation. Each session should provide enough water to reach a depth of at least 15 cm, encouraging deep root growth. On sloped areas, water should be applied slowly to allow for better absorption and prevent runoff. When using sprinkler systems, follow three key rules: use fine nozzles or mist sprays, apply water at a rate matching soil infiltration, and avoid over-saturation. Aim for a wetting depth of 10 to 15 cm to ensure healthy root development without waterlogging.
Fertilization is another critical step in autumn care. Although many people overlook it, applying two rounds of fertilizer between late August and late October can significantly improve root development, enhance cold tolerance, and extend the green period. This also helps the turf recover faster in the following spring. A recommended dose is about 18 grams of urea per square meter. It's important to apply fertilizer when the grass is dry to avoid leaf burn. After application, water the area immediately to help the nutrients penetrate the soil and be absorbed by the roots. Uniform distribution is key to prevent patchy growth or damage.
Trimming is equally vital. Cool-season grass grows rapidly from mid-May to mid-October, requiring frequent mowing—up to 13 times a year. If not trimmed regularly, the grass may become tall, weak, and prone to disease. Mow when the ground is firm and not wet to avoid creating ruts. The ideal time is when the grass is dry. Keep the cutting height above 5 cm, and on slopes, ensure a flatter cut. Remove clippings promptly to improve air circulation and reduce disease risk. Always keep the mower blade sharp to minimize leaf damage. Avoid letting the grass flower, as this consumes valuable energy. The final cut before winter should be at least 8 cm high to help the lawn survive the colder months.
Pest and disease control is also important in autumn. As temperatures drop, many pests and diseases decline naturally. Practices like regular mowing, weed removal, and maintaining proper moisture levels can further reduce risks. The main focus should be on preventing issues before they occur. Rust disease is a common concern, but with prompt action, it can be managed effectively without causing major damage.
By following these practices, turf managers can ensure their lawns remain healthy, vibrant, and resilient through the changing seasons.