Abstract This paper studied the effect of bumblebee numbers and distance between hives on watermelon
seed production in net room by treatment Ⅰ：2 250 bumblebees · hm-2 and treatment Ⅱ：3 000 bumblebees ·
hm-2．Results showed that all indicators of watermelon seed treated by treatment Ⅱ were superior to those
treated by treatment Ⅰ，when the distances between hives were the same．Among treatment Ⅱ，the seed number
of single watermelon at the site 6 m away from the hives was the largest，significantly higher than that of the
contrast．Besides，the seed weight of single watermelon in this area was also the hightest，followed by the site
9 m away from the hives under treatment Ⅱ．There was no significant differences between the above 2 sites．
The highest weight of single watermelon and the 1 000 seed were found at the site 12 m away from the hives
under treatment Ⅱ，followed by the site 9 m away from the hives under treatment Ⅱ，there was no significant
differences with that of the contrast．In conclusion，seed quality is the best at site 9 m away from the hives and
with 3 000 bumblebees · hm-2 in net room．
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Received: 09 January 2020
Published: 28 June 2020
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