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The results of TCA treatments to control couch

, : The results of TCA treatments to control couch. Scertrykk 24 Stat. Plant. Ugrasbiol. Avd., Vollebekk, Norway. 10

The results are given of over 60 trials during 1955-7 on farms in east Norway, in which TCA (usually 20-30 kg. TCA/ha.) was applied either in autumn or spring to control Agropyron repens. 20-25 kg. TCA/ha. appeared to give the best results. A rainfall of 40-60 mm. in April appeared to give the best results; 20-30 mm. appeared to be too small to ensure good distribution of TCA in the soil. Applying TCA as early as possible in spring, even before frost had left the ground, gave the best results.


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