Evaluation of rooting ability in cabbage plug seedlings by drag resistance (resistance to uprooting).

摘要

The drag resistance (resistance to uprooting) of cabbage seedlings after transplanting was measured with a pull gauge. A high coefficient of correlation existed between the increase in root weight and the drag resistance of seedlings made within 8 days of transplanting. The same tendency was observed for the quantity of new roots growing out from the rootball. The drag resistance of seedlings decreased when plug seedlings were placed in the dark after transplanting. The drag resistance was not affected by uprooting speed of the seedlings. By subtracting the drag resistance of seedlings just after transplanting from the experimental values, the effect of particle size in the soil media was excluded.