The result of the calculation of the plowing efficiency, which is an important factor for the plowing capacity on the one-way plowing, was previously given by the report No. 7. Through our recent experiments it has become evident that the value of the calculation agrees almost with the value obtained from the experiments.
The tractor used in the experiments was YM-18A, the furrow width being 10 in. two furrow and the working speed 1m/sec. In the central portion of the experiment field we took the normal plowing and the furrowed plowing method, dividing the portion into section of which the short side was 10m, We consider this to be the most capable method for the field. In the peripherical portion of the field. we took the semi furrowed plowing method.
The efficient curves getting from the experiments are shown in Fig. 2. It will be seen from the figure that the efficient curve of the furrowed plowing method is lower about 3% on an average than that of the normal plowing method. The result of the calculation on actual values of the turning time which was measured setting different types of plows onto tractors is shown in Fig. 3. In this figure, we can see a tendency of the narrower the plowing width the lower the plowing efficiency in the normal plowing, while in the furrowed plowing, the plowing efficiency does not depend on the plowing width but is always constant.
If we set the forward speed of a tractor constant, the turning time varies by types of the tractor.
The influence of these factors to the efficiency is shown in Fig. 4. In the normal plowing method on a small area, a type of the tractor of which the turning time is short is superior. However, if the field area is increased, the efficiency of large type tractors having a higher reversible speed will be superior. In the furrowed plowing method, the difference of the turning time shows directly differences of the efficiency. When the field area increases, however, we can see a tendency of these differences decrease gently.
Lastly, the capacity curve, which was made from experimental efficiency values, is shown in Fig. 5. In considering plowing capacity, increases of the working speed and plowing width, besides the efficiency, are generally considered to be important. In the Fig. 5, however, we can see that the working speed is somewhat less effective to the plowing capacity than the plowing width. Consequently, it seems important to make wider the plowing width as much as possible according to the traction capacity of each tractor.
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