Technical
“To assume what worked historically at one venue may be as effective at another, may be to assume
incorrectly”
average, throughout 2012, when compared with previous years.
Push-up poa annua greens - usually apparent in shaded areas and/or low lying greens, these types of greens - generally wetter than most - have been subject to, on average, a 3-5% increase in the upper 0-20mm.
Sand based greens - represented by USGA or similar variations, these greens have managed better through 2012. Although still showing some increases, these have been, on average, contained at 0-2%. It is fair to say that the benefit of the extensive construction methods with regard to organic matter accumulation has been observed during 2012/2013.
Part filled 10mm hollow core hole - commonplace at renovations
yourselves on the reduction of organic matter in your greens. As course managers, this is commonly experienced as an inherited issue upon commencement of a new role. To what extent do we reduce it? At what rate did we reduce it? These are parameters often unknown. The impact of climate and the greens construction are seldom factored in to these achievements. This is significant, in the sense that there is no exact formula. As outlined within parts 1 and 2 of our organic matter articles, some greens are prone to quicker organic matter accumulation than others. To assume what worked historically at
one venue may be as effective at another, may be to assume incorrectly.
Some of us have to work harder than others.
2012-2013 has presented an interesting year for organic matter results. In general in 2013, increases have been observed across the board, due to a combination of reasons, most significantly excessive rainfall. What is further apparent is that some types of green have been more prone to increases than others.
Push-up greens - these, in general, represent the majority of the samples we processed, and have shown a 2-3% increase in the upper 0-20mm on
Over and above the construction type of greens, maintenance practices implemented during wet years has dictated increases experienced. Those who continued with sand dressing programmes, and committed to renovation works in general, minimised organic matter increases and achieved ongoing reductions.
What percentage of organic matter are you starting from?
The above is further emphasis that there is no exact plan or formula for the reduction of organic matter. The primary reason for this is that very rarely are the starting points or the rates of organic matter accumulation the same. In order to formulate a bespoke
programme for organic matter reduction, an accurate interpretation of the existing situation is required. From the data accumulated, we are able to determine the efficacy of outlined programmes with regards to organic matter reductions.
At 3-7% in 0-20mm and 20-40mm
If you are within this range it would be fair to say the hard work is done and the focus is increasingly on dilution of the organic matter in the upper profile.
JUNE/JULY 2013 PC 125
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