Phruttikam kankep renu khaophot khong phungphan (Apis mellifera L.) lae kan phrae krachai khong laong renu.

The distribution pattern was measured at Kampangsaen Campus by index of dispersion (s2/-x) and morisita's index (I delta). It was found that the pattern of corn pollen dehiscence in the field was clumped distribution (s2/x-, I delta > 1) at 2-4 days after flowering (51, 52 and 53 days after planting). There was no significant difference in the amount of corn pollen counted with slide traps (22 x 22 sq. mm.) between the four corner spots and the central spots; and also among the head wind columns (horizontal) with the central wind columns and the tail wind columns, and between the border rows (vertical) and central rows. The average amount of corn pollen shed, peaking on day four after flowering was 0.65 gm. per plant per day. The total weight of pollen was 24.57 kg. per rai. The number of bees was highest during 0800 - 0900 a.m. averaging 2.69 and 5.08 bees per 1000 plants in the larger site and the smaller site, respectively. The distribution pattern of bees was clumped (s2/x-, I delta > 1) during flowering period. The results of field observations showed that there was a highly correlation between the number of bee counted and the amount of corn pollen at the dehiscence time during 0800 -0900 a.m. and during flowering period. The difference on the number of pollen grains in the cage with bee colony inside (591.63 grains per 22 x 22 sq. mm.), the cage without bee colony inside (270.82 grains per 22 x 22 sq. mm.) and also the open plot (233.66 grains per 22 x 22 sq. mm.) were highly significant. The highest quantity of corn pellets averaged 2,212 pellets per colony per day (44.79 percent) and 1,594.5 pellets per colony per day (42.70 percent) from the larger site and the smaller site respectively, during 0800 - 0900 a.m. At flowering, 5328 pellets per colony (16.52 percent) and 4070 pellets per colony (27.30 percent) from the larger site and the smaller site respectively.