This report shows arranged results of the mechanical-stumping tests of the new pine root stocks grown on the soil of volcanic ashes in Kamikita region, Aomori Prefecture, using several kinds of Rakedozer such as BF, D 7, BB IV, D 6, NTK 4 and D 4 types.
The results are summarized as follows
(1) The time required for stumping (
t) corresponding with the diameter of root stock (
d) somewhat scatters, because of great variety and complication of factors which influence on mechanical stumping. Therefore, the relation of (
d) with (
t) should be expressed with an extent.
Table 8 is considered to be useful practically.
(2) The raking number (
N) corresponding with (
d) scatters in the extent less than (
t) corresponding with (
d). Therefore, there is room for studying mechanical stumping from this point of view.
Table 9 is trial calculation (
N)-(
d) values.
(3) (
t/ N) corresponding with (
d) is the cycle time of mechanical stumping. Because
t=
N×
t/N,
Table 9 is considered to be useful practically, together with
Table 8.
(4) Each raking method of various kinds of Rakedozer differs with one another. Test results show the characteristic of each type Rakedozer. It is explained in
Table 10.
(5) Root types are essential factor for mechanical stumping. They are shown in
Table 11.
(6) It is considered that the test results shown in this paper are one example of mechanical stumping of pine root stocks.
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