　液体を花粉増量剤に用いた人工受粉がキウイフルーツ‘ヘイワード’の結実率，果実品質に及ぼす影響について調査した。ショ糖溶液（0.1％寒天添加）を用いた人工受粉では，液体中の花粉の希釈倍率 125～1000倍の範囲で，慣行資材のポーレンエイド溶液を用いた場合と同程度の結実が確保された。果実品質は，花粉使用量の少ない1000倍区でやや果実重が軽く，糖度が低い傾向が認められたが，その他の倍率では各倍率間やポーレンエイド溶液区との間の果実品質に大きな違いはなく，ショ糖溶液を花粉増量剤に用いた人工受粉が可能なことが明らかとなった。果実重 100ｇ以上の果実を得るために必要な種子数は 820個程度で，ショ糖溶液を用いた人工受粉における花粉の希釈倍率は 250～ 500倍の範囲が適当と考えられた。また，ショ糖溶液より約 200円／Lのコストの削減が可能な液糖溶液を用いて人工受粉を行ってもポーレンエイド溶液と同程度の結実，果実品質が得られ，液体を用いた人工受粉におけるコストの低減が可能となった。

　We investigated the effects of artificial pollination using a liquid pollen extender on the fruit set percentage and fruit quality of the kiwifruit vine ‘Hayward'. The fruit set resulting from artificial pollination using a sucrose solution (with the addition of 0.1% of agar) was confirmed to be equal with artificial pollination executed using a conventional Pollen aid solution in the range of 125~1000 times the concentration for pollen with the solution. With regard to the fruit characteristics, the weight tended to be lighter and Brix readings tended to give lower readings in the fruit harvested from pollen diluted 1000 times which meant less pollen. For kiwifruit harvested by way of other pollen dilution ratios with a sucrose solution and Pollenaid solution, no significant differences were observed among them. The above experiments suggest the possible use of a sucrose solution as a pollen extender for artificial pollination. To obtain fruit weighing more than 100g, the number of seeds per fruit is required to be about 820; and we concluded that the proper dilution ratios of pollen with a sucrose solution in artificial pollination to be in the range of 250 - 500 times per pollen unit. Also, it was confirmed that the fruit set and quality of fruit resulting from artificial pollination, using a liquid sugar solution in place of a sucrose solution resulted in harvesting a fruit set and fruit quality equivalent to that grown artificially pollinated with a Pollenaid solution. Use of a liquid sugar solution promises a cost reduction of about \200/L.