Koneellinen kitkentä taimikon varhaisperkauksessa – työajanmenekki, kustannukset ja työjäljen laatu

Rantala, Juho; Kautto, Kari

doi:10.14214/ma.5927

Cited by 3 publications

(8 citation statements)

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“…The Naarva uprooter (Pentin Paja Ltd.) can reportedly clear an average of 0.14-0.16 ha of spruce seedling stand per productive work hour (PWh 15 , all delays max. 15 minutes included), i.e., 6.3-7.4 h ha -1 (Rantala and Kautto 2011;Hallongren and Rantala 2013), which is similar to the speed of manual cleaning. Therefore, the competitiveness of uprooting is greatly dependent on how well the treatment prevents the need for later pre-commercial thinning.…”

Section: Introductionmentioning

confidence: 78%

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Cleaning Scots pine seedling stands with mechanical uprooters – a work quality comparison of two related devices

Hallongren¹,

Kankaanhuhta²,

Kukkonen³

2016

Silva Fenn.

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Cleaning Scots pine seedling stands with mechanical uprooters -a work quality comparison of two related devicesHallongren H., Kankaanhuhta V., Kukkonen M. (2016). Cleaning Scots pine seedling stands with mechanical uprooters -a work quality comparison of two related devices. Silva Fennica vol. 50 no. 3 article id 1514. 15 p. http://dx.doi.org/10.14214/sf.1514. Highlights• The productivity of the narrower modified device was significantly better than the wider original device.• Work quality did not differ significantly between devices when stand characteristics, regeneration success and pre-existing damage were taken into account.• Results indicate that mechanical uprooting devices may be further developed to a cost-effective alternative to motor-manual techniques for the early cleaning of direct seeded commercial Scots pine stands. AbstractCommercial forests require early cleaning to ensure the unhindered and uniform growth of crop trees. In order to be cost effective, non-crop vegetation should be uprooted to prevent their recovery. Performing this work manually is a labour-intensive task but it can be done mechanically. We evaluated the efficiency of two uprooting devices in direct seeded Scots pine (Pinus sylvestris L.) stands ca. 1 m tall. Productivity and quality of the uprooting work was investigated across eight stands and ca. 160 sample plots in northern Karelia, eastern Finland. Time consumption of the uprooters was analyzed through a linear regression model and the work quality through a multilevel multivariate model in terms of the number of individual Scots pine seedlings, processing units (i.e., a bunch of seedlings to be harvested in the future) and broadleaves. The productivity of the narrower modified device was significantly better in terms of time consumption than the wider original device. Work quality did not differ significantly between devices when stand characteristics, regeneration success and pre-existing damage were taken into account. Results indicate that mechanical uprooting devices may be further developed to a cost-effective alternative to motor-manual techniques for the early cleaning of direct seeded commercial Scots pine stands.

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Section: Introductionmentioning

confidence: 78%

“…1 m tall and operation should be done in adequately accurate manner by experienced operators, like in spruce seedling stands studied by Rantala and Kautto (2011) and Hallongren and Rantala (2013).…”

Section: Introductionmentioning

confidence: 99%

Cleaning Scots pine seedling stands with mechanical uprooters – a work quality comparison of two related devices

Hallongren¹,

Kankaanhuhta²,

Kukkonen³

2016

Silva Fenn.

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“…A need nevertheless exists for new mechanisation ideas and business concepts that lower the need for human resources in forestry, while providing higher productivity, greater cost-efficiency, and quality improvements. Earlier research into the mechanisation of silvicultural work has focused on productivity, costs and quality (Saarinen 2004, Rantala and Laine 2010, Rantala and Kautto 2011, as well as biological issues (Luoranen et al 2011). Despite this, the fact remains that mechanisation of silvicultural works will proceed no further without profitable growth in the manufacture of the related machines and devices.…”

Section: Introductionmentioning

confidence: 99%

“…During early cleaning, such work is based on uprooting, where the device grips and lifts clutches of sprouts from the ground by their roots. In this case, cost-effectiveness is highly dependent on whether pre-commercial thinning is required after the mechanised uprooting (Rantala and Kautto 2011). All pre-commercial thinning devices are based on cutting blades (Strandström et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Taken together, these work types have a mechanisation potential of around approximately 90% (Strandström et al 2009). Since existing machine concepts are already satisfactory in terms of competitiveness and the quality of work produced (Rantala et al 2009, Saarinen and Rantala 2010, Rantala and Kautto 2011, the next step involves finding new methods of commercialising and marketing such equipment.…”

Section: Introductionmentioning

confidence: 99%

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Commercialisation and international market potential of Finnish silvicultural machines

Hallongren¹,

Rantala²

2012

Silva Fenn.

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Recently, the need to mechanise silvicultural operations has increased in the Nordic countries. While several new machine concepts have been developed, the manufacture of silvicultural devices remains at the market introduction stage. Information is required in support of existing and forthcoming Finnish small-scale producers of silvicultural devices, who wish to commercialise and further market their innovations in domestic and export markets. The aim of this study was to identify the opportunities, challenges and market potential of business activities that develop in connection with device or machine production. Small-scale Finnish manufacturers of silvicultural devices, Finnish large-scale harvester manufacturers and international silvicultural experts participated in the study. The results show that participant groups have varying opinions of cooperation methods and export activities, as well as of the export markets with the best potential. According to international silvicultural experts, mechanised planting and pre-commercial thinning have the greatest potential worldwide. However, demand for mechanised pre-commercial thinning and planting has been mainly confined to the Nordic countries. For a foreign firm marketing a new silvicultural machine concept, the most important customers and cooperation partners are locally operating forest firms, machine contractors and research organisations. The results of the study provide a useful overview of the current state of silvicultural device manufacturing in Finland.

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Uprooting as a pre-commercial thinning operation in young Norway spruce stands

Saksa¹,

Miina²,

Luukkonen³

2023

Silva Fenn

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Uprooting, as a mechanical pre-commercial thinning operation (PCT), removes competitive, undesired trees with roots to prevent or reduce the need for a second PCT. The state of 66 young Norway spruce (Picea abies (L.) H. Karst.) stands was explored 3–5 years after uprooting to assess the quality of uprooting in terms of the number of competing birches (Betula spp.) and the probability of freely growing crop tree spruce (no competing trees taller than 2/3 of the crop tree’s height). In the uprooted spruce stands, the number of birches was, on average, about 3800 stems ha−1, and in every fifth stand, it was less than 2000 stems ha−1. The number of birches increased with increasing site wetness (TWI), site fertility and thickness of the humus layer. In 80% of the stands, there were at least 1000 freely growing spruces ha−1, which is approximately the stem number to be left growing after first thinning in a spruce stand. If the height of crop tree spruces was 125 cm at uprooting, the probability of freely growing stems varied from 0.6 to 0.8 in typical cases. According to simulations at the first thinning stage, in most stands, birch was less than 10% taller than spruce, and the volume of birches was low enough that, in the future, spruce and birch would grow in the same crown layer as a mixed spruce–birch stand. The results showed that uprooting can serve as the only PCT operation in a planted spruce stand. The quality obtained by uprooting can be improved with careful selection of timing and conditions for uprooting; the optimal uprooting time is when crop tree spruces have reached about breast height.

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Koneellinen kitkentä taimikon varhaisperkauksessa – työajanmenekki, kustannukset ja työjäljen laatu

Cited by 3 publications

References 1 publication

Cleaning Scots pine seedling stands with mechanical uprooters – a work quality comparison of two related devices

Cleaning Scots pine seedling stands with mechanical uprooters – a work quality comparison of two related devices

Commercialisation and international market potential of Finnish silvicultural machines

Uprooting as a pre-commercial thinning operation in young Norway spruce stands

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