Impact of the Heating Greenhouse and Root-Zone prior to Sunrise on Water Uptake, Photosynthesis, Plant Growth and Yield for Tomato Rockwool Hydroponics

This study aims to determine effects of heating greenhouse and root-zone prior sunrise in winter season on water uptake, photosynthesis, plant growth yield for tomato rockwool hydroponics. Greenhouse was controlled at 25°C with 4-day intervals [Control: None heating, PH-30: 30min-heating (07:30–08:00), PH-60: 60min-heating (07:00–08:00), PH-90: 90min- (06:30–08:00)] Sap Flow- Integrated Solar Radiation-automated irrigation systems (SF, ISR) experiment I. Root-zone 19°C (RPH-90) or 13°C (Control) ISR system II. The substrate temperature increased 4°C both PH-30 PH-60 treatments, 7°C PH-90. In the SF system, first started average 18, 26, 30 mins earlier under PH-30, PH-60, PH-90, respectively compared system. uptake higher as duration longer. photosynthetic rate PH-90 than that PH-30. degree leaf area change greater between Control, followed by ranged from 13.3 19.1°C RPH-90 treatment, whereas it 11.0 17.2°C control Experiment use efficiency (WUE), area, specific marketable about 7.0, 10.3, 23.8, 23.0%, RPH-90, control.