営農用トラクターの使用能力限界について

抄録

We have carried out the practical tests concerning to the deep plowing, subsoil plowing (Panbreaking) and mole plowing at the typical less fertile lands, one was “Shinden” district and the other was “Tomioka” district, and each implements was drawn by a farm tractor-Fordson Major. The top soil is clay loam at “Shinden” district and volcanic sandy loam or loam at “Tomioka” district. But the subsoil is heavy clay at the both districts. The conclusions which are induced from these practical tests are as follows.
About 2.5 tons class farm tractors are able to draw a single-bottom 16″-20″ integral-mounted tractor plow at a depth of 31-33cm, and up to 30cm with a 2-bottom 12″ trailing tractor plow equipped with subsoilers. These plowings may be not only plowed under 2nd or 3rd gear traction, but subsoil plowing (Pan-breaking) can be penetrated effectively, too. But it is difficult to mole-plow up to 50cm. Therefore if the farm area is wide sufficiently or a tractor is used in cooperation, it is desirable to get at least about 2.5 tons class farm tractor in Hokkaido.