. Agriculture for southern schools. Fig. 121. — Mullein Fig. 122. — Narrow-leaved Dock Plowing them with a sharp plow sometimes destroys themif the roots are all brought to the surface and thus is one of the easiest ways to kill Bermuda grass. Shal-lowplowing is best for killing this grass because the shal-low furrow-slice dries out more completely than a thickerlayer of upturned soil. Any plant is more easily killedlate in its growing season, for then it cannot so easily 184 AGRICULTURE mend an injury. Johnson grass is more easily killed inAugust or September than earlier. In killi
. Agriculture for southern schools. Fig. 121. — Mullein Fig. 122. — Narrow-leaved Dock Plowing them with a sharp plow sometimes destroys themif the roots are all brought to the surface and thus is one of the easiest ways to kill Bermuda grass. Shal-lowplowing is best for killing this grass because the shal-low furrow-slice dries out more completely than a thickerlayer of upturned soil. Any plant is more easily killedlate in its growing season, for then it cannot so easily 184 AGRICULTURE mend an injury. Johnson grass is more easily killed inAugust or September than earlier. In killing biennial orperennial weeds, they must be cut off below the crown. Smothering weeds. — Sometimes the farmer can hireother plants to kill weeds. A crop of cowpeas or ofvelvet beans will sometimes smother Bermuda grass sothat very little of it is left at the end of the season. Thecowpeas or velvet beans kill the grass by shading it andby taking up the soil water which the grass needs. Keeping weeds off the farm. — Good plow
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