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Hidaka, Kota; Nakahara, Shunji; Yasutake, Daisuke; Zhang, Yue; Okayasu, Takashi; Dan, Kazuhiro; Kitano, Masaharu; Sone, Kazuyoshi
Scientia horticulturae, 07/2022, Letnik: 301Journal Article
•Crop-local CO2 enrichment system was developed by modifying a fuel-burning generator.•The new system supplies CO2 from perforated tubes set in the interrow space.•Crop-local CO2 enrichment effectively raised canopy CO2 concentration of strawberry.•Crop-local CO2 enrichment increased marketable yield.•Fuel use efficiency was improved by crop-local CO2 enrichment. In protected strawberry (Fragaria × ananassa Duch.) cultivation, CO2 enrichment is essential to enhance both fruit quality and yield. Fuel burning generators are commonly used to supply CO2 to entire commercial greenhouse space. However, methods that are less fuel-based are desired for contemporary agricultural practices. A new crop-local CO2 enrichment system using a modified fuel-burning generator has been developed to increase yields and decrease the fuel required for CO2 enrichment in greenhouse strawberry production. This crop-local CO2 enrichment (CLC) method directly supplies CO2 from perforated tubes set in the interrow space of the plant canopy. The effects of this technique on fruit quality, fruit yield, and fuel use efficiency have been examined in comparison with conventional CO2 enrichment (CC) practices. The CLC method increased CO2 concentration inside the plant canopy by 100–200 μmol mol–1 when compared with CC under the ventilating conditions by a roof window. This resulted in significant increases of approximately 10–26% in the average fruit weight, 13% in the cumulative fruit number, and 22% in cumulative marketable yield when compared to CC. Furthermore, cumulative fuel consumption was approximately 27% lower with the CLC method when compared to CC. These results indicate that CLC improves fuel use efficiency when compared with CC as it increased yields and decreased fuel consumption.
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