The differences in terms of water volume differs greatly in all irrigation systems. The differences are usually more than 25%. Fertiliser The quantity of fertiliser and the time and frequency of application will depend on the soil type, lawn use, weather and the fertiliser format. The results of the soil analysis values can be an indication for the basic fertilising. Well-nourished soils have the following minimum deposits per 100 g of soil. Lawn type Nitrogen N Phosphate P2O5 Potassium K2O Magnesium MgO Ornamental lawns 10–25 3–5 10–15 1–2 Home lawns little wear and tear heavy wear and tear 5–15 10–25 3–5 5–8 8–12 10–15 1–2 2–3 Sports lawns little wear and tear heavy wear and tear 15–25 20–35 5–10 10–15 10–15 15–25 2–3 3–5 Landscape lawns 0–10 0–5 0–10 0–1 Annual fertiliser requirements in g (pure nutrients per m2): Irrigation Lawn grasses require sufficient volumes of water for healthy growth. In dry periods, watering will prevent the turf from drying out. Various irrigation systems are available for this purpose. According to DIN 18035 Part 2, an irrigation system must be capable of providing 25 l of water/m2 in a time frame of 5 to 15 hours, whereby no more than 5 l/m2 should be consumed within an hour. Watering often with small volumes of water should be avoided because only the upper layer of soil will be soaked and the roots of the grass plants will remain in the surface layer. This severely limits the resilience of the lawn. It can also mean a transition in the plant stock in the direction of shallow-rooted species (Poa annua). Daily max. temperature Daily water consumption Watering intervals for 25 l/m2 water per day > 30 °C > 5 l/m2 3–5 25–30 °C 3– 4 l/m2 6–8 20–25 °C 2– 3 l/m2 8–12 > 20 °C < 2 l/m2 > 12 Watering volumes & frequency for sports grass Weeds Wild plants are unwelcome in ornamental lawns, sports fields and golfing greens. They are detrimental to the appearance of ornamental lawns and can even can even negatively impact the game on, for example, hockey pitches or golfing greens. This sort of plant is considered a weed in lawns. They are often resistant to maintenance measures. Weeds in lawns can be combated through preventative measures and mechanical measures or by chemical means. Prophylactically it should be ensured that there are no gaps in the lawn cover that would allow weeds to easily take a foothold. Contributing to the formation of gaps are: too low a cut with damage to the sod, corrosive damage through fertiliser or pesticides, disease or pests. When seeding a new lawn and the soil does not undergo steaming or chemical treatment, it is unavoidable that weeds too will germinate and grow. Under normal circumstances, annual plants pose no real problems in newly seeded lawns, since they will be inhibited by repeated mowing of the grass. 65 SERVICE
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