Energy and Mass Balance of a Closed-type Transplant Production System. (Part 3). Carbon Dioxide Balance.

YOSHINAGA Keita, OHYAMA Katsumi, KOZAI Toyoki

doi:10.2525/jshita.12.225

Bibliographic Information

Other Title

閉鎖型苗生産システムのエネルギおよび物質収支　（第３報）　　二酸化炭素収支
ヘイサガタナエセイサンシステムノエネルギオヨビブッシツシュウシダイ3ポウ 2サンカタンソシュウシ
Carbon Dioxide Balance
二酸化炭素収支

Search this article

Abstract

The CO₂ balance of a closed-type transplant production system with artificial lighting was investigated. Sweetpotato (Ipomoea batatas (L.) Lam cv. Beniazuma) plants were grown for 15 days at photosynthetic photon flux on the tray surface of 100, 200 and 300 μmol m^-2 s^-1 on days 0-2, 3-11 and 12-14, air temperature of 30°C, CO₂ concentration of 1000μmol mol^-1, relative humidity of 80/100% (photoperiod/dark period) inside the system and photoperiod of 16h d^-1. The CO₂ concentration inside the system during dark period was increased with time because of the respiration of plants. The daily amount of supplied CO₂ on day 14 was 10 times larger than on day 1 due to the increasing in net photosynthesis of the plants with passage of days. The amounts of supplied CO₂, assimilated CO₂ by the plants through net photosynthesis and released CO₂ by ventilation to the outside during 15 days were 6.1, 5.6 and O.5 mol m^-2, respectively. These results show that the CO₂ utilization efficiency is more than 7-30 times higher in the closed type transplant production system than in the open type system (i. e. greenhouse), and the closed-type transplant production system is profitable for minimizing the amount of supplied CO₂ in plant/transplant production.

Journal

Shokubutsu Kojo Gakkaishi

Shokubutsu Kojo Gakkaishi 12 (4), 225-231, 2000

JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS

Keywords

Details 詳細情報について

Export