Íslenskar landbúnaðarrannsóknir - 01.09.1977, Side 40

38 ÍSLENZKAR LANDBÚNASARRANNSÓKNIR
speed coefficient in the range of 3—5 kps2
/dm4. The specific traction force was gener-
ally found to be lower for double-furrow
than for single-furrow ploughs.
In each field attempts were made to deter-
mine the ratio between the weight of the
tractor and the maximum traction power
requirements for ploughing. This ratio (kg/
dm2) was found to vary between fields from
HEIMILDIR — REFERENCES
Aslyng, H.C.: Klima, jord og vandbalance i jord-
bruget. Kulturteknik I, 4. útg. DSR Forlag.
Kaupmannahöfn 1968, 303 bls.
Björn Jóhannesson: íslenzkur jarðvegur. Skýrsla
frá Atvinnudeild háskólans. Reykjavík 1960.
Seria B 13. 140 bls.
Gorjachkin, V. P.: (Collected Works). — Sel’k-
hozgiz. Moskva 1940. (Skýrsla frá: Gill og
Van Den Berg).
Helztu tilraunaniðurstöður með verkfæri fram til
1945. Skýrslur verkfæranefndar ríkisins 1947.
I II: 5—7.
approximately 100 on sandy soil to 170 on
newly drained peat soil. Consequently aver-
age size tractors weighing 1500—2000 kg
should have sufficient traction power for
single-furrow ploughs except on newly drain-
ed peat soil. On the other hand large tract-
ors weighing more than 2000 kg are requir-
ed for pulling double-furrow ploughs except
on sandy soil.
Pedersen, T.: Underploven, Kennsluhefti við
Landbúnaðarháskólann í Kaupmannahöfn
1969. 35 bls.
Pedersen, S.: Plovens trækkraftbehov. Den kgl.
Veterinær og Landbohöjskole, Jordbrugsteknisk
Institut, 1971. Meddelelse nr. 16. 97 bls.
Söhne, W.: Untersuchungen iiber die Form von
Pflughörpern bei erhöter Fahrgechwindigheit.
Grundlagen der Landtechnik 11 (1959). Kon-
strukteurheft 16/17: 22—39.