福岡県農業総合試験場研究報告14（1995） pp 137 - 141
ニホンナシ‘幸水’の生育樹相が収量及び果実品質に及ぼす影響
林 公彦・牛島孝策・千々和浩幸・姫野周二・吉永文浩・鶴 丈和
本県におけるニホンナシ‘幸水’の高品質安定生産が可能な好適生育基準を設定するため，樹相と収量及び果実品質との関係を調査した。収量は，着果数及び側枝本数と高い相関が認められた。しかし，調査樹の着果数が着果基準以下であったため，１果重と着果数，糖度と着果数との間には明らかな相関がみられなかった。樹相では，生育期の葉面積指数が大きいほど収量は増加する傾向が認められたが，１果重及び糖度に対する影響は明らかではなかった。また，収穫時の適正な葉面積指数は３．０程度と推定された。側枝の枝齢別利用割合は，果実肥大及び収量確保の面から，１年生側枝５０〜６０％，２年生側枝２０〜３０％，３年生以上側枝１０〜２０％の範囲が適正と推定された。
［キーワード：ニホンナシ，幸水，収量，品質，樹相］
Influence of Growth Pattern on Yield and Fruit Quality in Japanese Pear 'KOSUI'. HAYASHI Kimihiro, Kosaku USHIJIMA, Hiroyuki CHIJIWA, Shuji HIMENO, Fumihiro YOSHINAGA and Takekazu TSURU (Fukuoka Agric. Res. Cent. , Chikushino, Fukuoka 818, Japan) Bull. Fuhuoka ACT.ic. Res. Cent. 14 : 137 -141(1995)
The effects of growth pattern on yield and fruit quality were investigated in order to establish the standard optimal growth condition for stable production of high quality Japanese pear 'KOSUI' in Fukuoka district. The yield was positively correlated with the number of fruits per one centiare and the number of lateral branches per one centiare. There was no correlation between the number of fruits per one centiare and the fruit weight, and the fruit sugar contents during harvest, because the number of fruits per one centiare on the sample trees was not considered as standard. Positive correlation existed between the leaf area index during the growth period and the yield per one centiare, while no correlation was observed between the leaf area index and the fruit weight, and the fruit sugar contents at harvest. The optimal leaf area index on the harvest season was estimated about 3.0. It was considered that proper rate for usage of lateral branch to obtain large fruit and maintain yield was 50 to 60 %, 20 to 30 %, and 10 to 20 % of the first year, second year, and third or more year of lateral branches, respectively.
[Key words : Japanese pear, KOSUI, yield, Fruit quality, Growth pattern ]
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