Both contractors and researchers are very pleased with the product and the
report also draws the conclusion that "... mounding is the only real
scarification method when planting spruce." A summary of the report is given
Mechanical planting gets good marks
Mechanical planting is increasing year after year. The Bracke
planting machine is the most common, and in Finland twenty Bracke Planters are
in operation this summer. Finnish researchers give very good marks to Bracke.
does very good planting work, and this has been demonstrated by both Finnish
and Swedish researchers. The Finnish Forest Research Institute has followed up
the results from several renewal areas that have been planted with Bracke.
Four years after the planting, 88 per cent of the plants were flourishing. A
similar survey carried out by SkogForsk (the Forestry Research Institute of
Sweden) showed about the same plant survival, or an average of eight per cent.
weevils and bark beetles are the main reason for plant spoilage on the trial
areas in Finland, while poor mechanical planting was only the reason for plant
spoilage on two of the sixty nine trial areas. The trial areas were on fertile
and fresh sandy soils and the main objective was to plant spruce.
Bracke planter makes a good mound where the plant is put into the ground, a
so-called inverted turf-planting or ridge method. In the trials the mounds
were on average 17 centimetres high, measured from the undisturbed ground
surface. The plants were also planted sufficiently deep.
from manual planting were a lot worse. A survey by the forest research
institute to investigate plant survival on renewal areas planted with spruce
shows that only 59 per cent of the areas had an adequate number of plants
three years after the planting. The reason for the plant spoilage was the
wrong scarification method, or no scarification at all. Harrowing is not a
suitable scarification method for spruce planting, and researchers are quite
adamant that mounding is the only real scarification method when planting
Text: Gerd Mattsson-Turku