| 摘要 |
PROBLEM TO BE SOLVED: To dig out and recover materials existing in the deep layer and shallow layer of a field, irrespective to wild taros or tubers which are unnecessary materials, and also recover soil aggregates which are also unnecessary materials, dug up together with the wild taros and tubers presenting in the deeper layer. SOLUTION: This unnecessary material-removing unit is provided by separating the unnecessary materials and soil with sand which are necessary materials, during the conveyance of the soil with sand, containing the dug out unnecessary materials, also returning the soil with sand which are the necessary material to the field C only the unnecessary materials in a housing part 4. COPYRIGHT: (C)2008,JPO&INPIT
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