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Source: http://www.hort.purdue.edu/newcrop/morton/kiwifruit_ars.html#Pollination

The flowers are mostly insect-pollinated. For small, single-row plantings, one male vine to every 5 females is necessary. In commercial plantings, 10 to 12% of the vines must be males, that is, about 1 male for every 8 or 9 female vines, and the males should be staggered evenly throughout the block plantations. The time of flowering must be ascertained so that the male and female plants will coincide. The female plants yield no nectar. It is recommended that there be 3 1/3 beehives per acre (8 per ha) when 10 to 15% of the flowers are open in order to assure adequate pollination. In anticipation of a shortage of hives for expanding culture, work was begun in New Zealand about 1980 to perfect means of collecting and drying pollen and preparing a suspension for spraying onto the blooming vines by tractor-drawn equipment. Pollen is commercially available in California also for artificial pollination.