Paavo Yli-Vakkuri 
Siemensiipien hankaajista ja niiden vaikutuksesta siemenen itävyyteen
Yli-Vakkuri P. (1959). Siemensiipien hankaajista ja niiden vaikutuksesta siemenen itävyyteen. Acta Forestalia Fennica vol. 68 no. 4 article id 7486. https://doi.org/10.14214/aff.7486
English title: On machines for abrading seed wings and their influence on the germinative capacity of the seedAbstract
This paper deals with two machines designed for abrading seed wings, and their influence on the germinative capacity of seed of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.). Both machines are commonly used in Finland.
The results of the study indicate that the act of abrading may cause slight or even serious injuries to the seed. Slight injuries of about 3% are probably not easily avoided if mechanical abrading is resorted to. It must be noted, however, that even this reduction in germinative capacity causes significant yearly loss. If the reduction in germinative capacity is greater, which seems to be possible, it is advisable to test the mechanism of the machine and its method of abrading. As the clearance of the machines can affect the extent of injuries, all machines should be tested. If possible, a continual operation control should be arranged. It could, at the same time, to supply material for improving the abrading method and equipment.
The PDF includes a summary in English.
Original keywords
kuusi;
mänty;
laitteet;
metsäpuiden siemenet;
karistamot;
siemensiivet;
siemensiipien hankaajat
English keywords
Pinus sylvestris;
Norway spruce;
Picea abies;
Socts pine;
seeds of forest trees;
seed extraction;
seed wings
Published in 1959
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