{"title":"Effects of the raising conditions and nitrogen concentration in the field on growth, development and fruit yield in strawberry forcing culture using 72-cell plug plants","authors":"K. Yamazaki, H. Kumakura, H. Hamamoto, Y. Saito","doi":"10.2503/HRJ.10.521","DOIUrl":"https://doi.org/10.2503/HRJ.10.521","url":null,"abstract":"イチゴ促成栽培における将来的な「育苗の分業化」を想定して,苗の供給者,実需者双方が活用または参照できるようなセル成型苗の利用技術について,基盤的研究を行った.‘章姫’,‘とちおとめ’および‘紅ほっぺ’の3品種について,セルの容量と形状が生育や移植時のハンドリングの良さに及ぼす影響を検討したところ,72穴で1セル当たり37 mLの丸形セルトレイにおいて,挿し苗後20日で根鉢が良好に形成され,1セル容量45 mL角形や70 mL丸長形セルトレイと比較しても,生育に遜色がなかった.このセルトレイを用いた場合の適切な育苗日数について,‘紅ほっぺ’を用いて調査した.20日育苗のセル成型苗は定植後の根の活着が良く,地上部の生育も良かった.頂花房の収量も,有意性はないものの30日や40日育苗に比べて多い傾向が見られた.20日間育苗したセル成型苗を,基肥施用前の土壌中の硝酸態窒素含量が8.8 mg・100 g−1乾土以上の圃場に定植すると‘章姫’,‘とちおとめ’および‘紅ほっぺ’のいずれの品種でも各花房出蕾日が遅れる傾向があり,10.3 mg・100 g−1乾土では,3月までの総収量が減少した.これは頂花房の分化の遅れとともに,頂花房と一次腋花房の分化・発達期が重なることで養分競合が起こり,全体的な生育遅延を招いたことが原因と考えられた.明らかな収量低下を招かないための基肥施用前の土壌中の硝酸態窒素含量の許容範囲は,‘章姫’では2.5~6.3 mg・100 g−1,‘とちおとめ’および‘紅ほっぺ’では4.4~8.8 mg・100 g−1乾土と判断された.","PeriodicalId":114914,"journal":{"name":"Horticultural Research (japan)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116675795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mikio Kobayashi, N. Horiuchi, M. Omura, Jingai Che, I. Ogiwara
{"title":"Comparison of Fruit Quality between Individual and Cluster Harvesting in Four Blueberry Cultivars","authors":"Mikio Kobayashi, N. Horiuchi, M. Omura, Jingai Che, I. Ogiwara","doi":"10.2503/HRJ.10.507","DOIUrl":"https://doi.org/10.2503/HRJ.10.507","url":null,"abstract":"In four highbush blueberry cultivars ‘Spartan’, ‘Bluecrop’, ‘Darrow’ and ‘Dixi’, quality of fruit harvested by individual and cluster was evaluated at harvesting and 14 days after storage (14 DAS). Individual harvesting picked the berries one by one, when the surface color became blue. Whereas cluster harvesting cut the peduncle of cluster when the surface color of 70~80% of fruits in the cluster turned blue. At harvesting, fruit weight was smaller and variations in fruit weight, fruit firmness, soluble solid content and titratable acidity were higher in cluster harvesting compared with those of individual harvesting. At 14 DAS, reduction rates of each trait in cluster harvesting, which decreased from harvesting to 14 DAS and the appearance of the fruit surface did not demonstrate shrink age. On cluster harvesting, ‘Bluecrop’ and ‘Darrow’ were characterized by limited variation in fruit weight at harvesting and limited rates of reduction in fruit weight, fruit firmness and titratable acidity during storage, while the strength of fruit setting was large. As a result, the fruits in cluster harvesting were not of uniform quality at harvesting but fruit quality maintained a longer shelf-life. ‘Bluecrop’ and ‘Darrow’ are available as cluster harvesting.","PeriodicalId":114914,"journal":{"name":"Horticultural Research (japan)","volume":"21 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132791128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}