Chinese cabbage directly seeded in late summer often receives heavy rain at the early stage of growth so that mechanical weed control is not always complete without hoeing by hand. This investigation was carried out to make sure of the effectiveness of combined application of mechanical and chemical weed control techniques in such cases.
Steerage hoe equipped with discs and sweep shares when used alone could reduce non-selectively most of weeds inter rows, but least of weeds within rows.
Herbicide (2, 4-dichlorophenyl-4-nitrophenyl ether) broadcasted immediately after sowing supressed grass weeds either inter rows or within rows, but it did not control broad leaf weeds which were mostly occupied by hairy galinsoga (Galinsoga ciliata BLAKE).
Steerage hoe combined with broadcast application of the herbicide reduced both kinds of weeds either inter rows or within rows, to the extent that hoeing by hand was unnecessary.
Steerage hoe combined with band application of the herbicide showed much the same effectiveness of weed control as that combined with broadcast application of the herbicide.

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