The effect of high atmospheric CO2 concentration on the feed compositions of different types of forage rice variety

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450018
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Crop production science
• Research Institution: University of Tsukuba
• Principal Investigator: KATO Morio 筑波大学, 生命環境系, 助教 (90204502)
• Co-Investigator(Kenkyū-buntansha): ISHIKAWA Naoto 筑波大学, 生命環境系, 助教 (20202963)
• Co-Investigator(Renkei-kenkyūsha): HASEGAWA Toshihiro 国立研究開発法人農業・食品産業技術総合研究機構, 農業環境変動研究センター, 上席研究員 (10228455)
• Research Collaborator: ENISHI Osamu 国立研究開発法人農業・食品産業技術総合研究機構, 畜産研究部門家畜代謝研究領域精密栄養管理ユニット
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 高二酸化炭素濃度 / 飼料用イネ / 乾物収量 / 飼料成分 / サイレージ

Outline of Final Research Achievements

Two forage rice varieties, Kusahonami (grain-weight type) and Leafstar (straw-weight type), were cultivated in Free-Air CO2 Enrichment facility, Ibaraki, Japan during 2013 and 2015. An ambient CO2 concentration (AMB: control) and an elevated CO2 concentration (FACE; AMB + 200 ppm) plots were set with 4 replications. In the cultivation with normal planting density (22.2 hills/m2) the dry-matter yields of both varieties were slight higher in FACE plot than in control, but the differences were not significant. There were no significant difference among treatments in feed compositions and silage quality. In the cultivation with sparse planting (11.1 hills/m2), the dry-matter yields of both varieties were significantly higher in FACE plot than in control contributed by vigor growth of each stem. Crude ash and neutral detergent fiber contents were decreased in FACE plots compared to control, which suggested the improvement of digestibility of forage rice.

Free Research Field

作物生産学