Abstract
The need for free water movement through the soil after sowing to obtain good nodulation of yellow lupins (Lupinus luteus) was verified in a glasshouse experiment. Withholding overhead watering after sowing reduced the number of plants nodulated by approximately 30% when compared with surface watering at either one or 3 days after sowing. The amount of nodule tissue of nodulated plants was also lowered. Lime pelleting or a higher rate of inoculation increased the number of plants nodulated, but did not increase the amount of nodule tissue on nodulated plants. With watering 3 days after sowing, fewer plants nodulated and they had less nodule tissue than with watering after one day, unless lime-pelleted seed was used or (in the case of number of plants nodulated) a higher rate of inoculum was used.
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