Michel Verheul
Seniorforsker
(+47) 934 08 525
michel.verheul@nibio.no
Sted
Særheim
Besøksadresse
Postvegen 213, NO-4353 Klepp stasjon
Sammendrag
Nye regler for økologisk landbruk krever at økologiske grønnsaker dyrkes i uavgrensa medium, det vil si uten tett skille mellom vekstmediet og den stedlige grunnen. Det betyr at økologisk agurk og tomat ikke lenger kan dyrkes i sekker eller matter med torv eller andre vekstmedier; de må dyrkes i grunnjorda eller ha forbindelse til denne. Det har ikke vært vanlig å dyrke på denne måten i kommersielle norske økologiske veksthus. Det kan derfor bli en utfordring for dyrkerne, og det kreves noen tilpasninger av dyrkingsmetoden og en mer langsiktig tenking, når det kommer til gjødsling, jordhelse og biologisk liv i jorda. Erfaringer fra Norge og andre nordiske land viser at det lar seg gjøre å dyrke på denne måten og at det kan gi like stor avling som ved dyrking i sekk.
Forfattere
Michel VerheulSammendrag
Det er ikke registrert sammendrag
Forfattere
Michel VerheulSammendrag
To document effects of High-Pressure-Sodium (HPS) and Light-Emitting Diodes (LED) lamps, six different cucumber cultivars (‘DeeRect’, ‘HiLight’, ‘Imea’, ‘Keirin’, ‘Shakira’ and ‘Topvision’) were grown hydroponically in a semi-commercial greenhouse compartment using standard HPS or LED supplemental top-light from December to March. A PPFD of 240 µmol m-2s-1, 20h a day, was used for both lamp types. In addition, plants were grown with or without LED inter-lighting (45 µmol m-2s-1, 20h a day). Global radiation during the experiment was less than 1.5 MJ m-2day-1. Setpoints for day and night temperatures were 24 and 21 oC respectively. CO2 concentration in the greenhouse was kept at 1100 ppm. Morphological traits (stem length, leaf area, leaf thickness, dry weights), yield (fruit fresh weight and number of fruits) as well as quality parameters were registered. Results show that the use of LED top-light reduced yield considerably compared to HPS top-light, mainly due to a reduction in the number of 1st class fruits harvested. Plants grown using HPS top-light were longer, had more internodes, a higher fruit weight, bigger leaf area and leaf area index (LAI) and ‘thinner’ leaves compared to plants grown using LED top-light. Light use efficiency (g FW mol PAR-1) was highest using HPS or a combination of HPS and LED inter-light and lowest using LED combined with LED inter-lighting, especially at the start of the harvesting period. Huge differences in yield reduction between different cultivars were observed. LED top light reduced the yield of ‘DeeRect’ with 35% and of ‘HiLight’ with 5% compared to HPS top light. Little differences in quality traits were observed between cultivars grown under HPS or LED lamps. However, inter lighting increased fruit weight and fruit quality (color, dry matter content, soluble solid content, chlorophyll content, vitamin C content and storage properties). Causes of differences between lamp types and effects on commercial greenhouse cucumber production in Norway are discussed.
Intelligent use of light and new lighting technology for energy efficient and quality-assured year-round production of cucumber in Norway
Divisjon for matproduksjon og samfunn
Emission-free smart greenhouse farming: increasing tomato production while reducing energy needs in a closed greenhouse system using an Environmental Control System
Divisjon for matproduksjon og samfunn
JordbærSmak: En optimalisert moderne produksjonsteknologi for mer smakfulle norske jordbær
Det er et mål å øke produksjonen i den norske grøntsektoren, inkludert jordbær, med inntil 50 prosent de kommende 15 årene. For å oppnå dette må dyrkingssesongen utvides, men da trengs en mye bedre kunnskap om hvordan man kan påvirke planteveksten og ta i bruk teknologi for å overvåke og beskytte plantene, uten at det går utover kvalitet og smak.
