You can achieve success when overseeding with bentgrass
surface sown in good contact with the rootzone. When overseeding, the recommended sowing depths are BELOW any thatch layer; the seed must always be in good contact with the rootzone to have a chance of establishing successfully, so try to work as much seed as possible through the thatch layer by whatever means you have available (micro-tining, verticutting, thatchaway units, sarrel rolling etc). It is easier to avoid severe
surface disturbance when overseeding with bentgrass rather than fescue, particularly if you have minimal thatch. Many Greenkeepers enjoy much greater success when they overseed with bentgrass several times during the active growing season (May to September) rather than one application during spring or autumn renovation. Overseeding during the active growing season gives the bentgrass opportunity for rapid germination and early establishment.
The implications of close
mowing heights can be overcome if you are able to sow the bentgrass seeds below the thatch layer in good contact with the rootzone. This protects it from mower blades and foot traffic and also helps to prevent drying out; adequate irrigation is critical at this time. By applying bentgrass seed at very low sowing rates over a period of three or four months, you will be able to significantly increase the percentage of desirable bentgrass in the sward, with all the benefits this offers. You will also have faster sward recovery at this time, reducing disruption to play. Light quality and day length is far better at this time of year for rapid, healthy plant growth. Perennial ryegrass (Lolium perenne) is increasingly being used for overseeding golf greens on parkland courses and for bowling greens. Rapid
germination, establishment and winter growth mean successful renovation can be achieved outside the usual window. An excellent surface during winter play is achievable, and disease scars can be repaired. Remember, cultivar selection
is extremely important, as characteristics vary greatly. Fineness of leaf and tolerance of close mowing are essential for this application. If your greens do not become too waterlogged during the winter, then a mixture of fine-leafed ryegrass and red fescue, can be used. The seed size of these two species means you can achieve
successful establishment by sowing them together at the recommended depth of 4-6mm. Warmer soil temperatures will help the fescue to compete alongside the ryegrass. Whatever grass seed mixture you are using, it is recommended to apply fertiliser AFTER the new seedlings have germinated. If you apply fertiliser pre-germination you are helping the existing,
undesirable grasses in the sward to compete against the emerging new seedlings. Successful overseeding means considering a whole raft of factors. Seeds need water, air and appropriate temperature to germinate and establish. Don’t allow the seed or seedling to dry out. Think about seed size, the recommended sowing depth below the thatch layer is critical for optimum germination. Pre-
seed preparation and appropriate maintenance practices are essential for optimum performance. Think about the synergy of species and cultivars within the mixture. Also think about timing, summer light quality and day length will help with establishment and recovery.
Read the full article at
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