| 摘要 |
<p>The whole or a portion of a drip irrigation system comprising supply piping and drip emitters is formed of polyethylene impregnated with a 2,6-dinitroaniline herbicide to prevent root growth into the irrigation system. An integral bead extending longitudinally within the piping or the baffles 28 of drip emitters 10, Figures 1 and 2, may be of the impregnated polyethylene. <IMAGE></p> |
