The Effects of Weed Control by Several Weed Control Machines to the Crab Grass (Digitaria adscendens Henr.)

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We selected the implements such as the shovels, sweeps and pencil-point weeders from the cultivator, steerage hoe and weeder and tested the effects of these operated methods at the stage of 1-2 leaves and at the stage of 4-5 leaves of crab grass (Digitaria adscendens Henr.).(1) Most effective treatments were the methods of uprooting and covering up with soil at the stage of 1-2 leaves by the shovels and cutting off the root at the stage of 1-5 leaves by the sweeps.(2) The limit of effective treatments was the stage of 1-2 leaves to the shovels availably and the stage of 4-5 leaves to the sweeps availably.
日本雑草学会の論文