Job offersmore »
- Growing Manager - Skye, Victoria
- Assistant Professor of Urban Horticultural Crops - United States (CA)
- Senior Inkoper - Maasdijk, Nederland
- Product Manager Biostimulants - Westmaas, the Netherlands
- Corporate Grower - Camarillo (CA), USA
- General Manager China - Kunming, China
- Buyer greenhouse crops - Almeria, Spain
- Trucking Fleet Manager - Azerbaijan
- Fresh Produce Traders Required for a Leading Dutch/UK Fresh Produce Business
- Key Accountmanager Horticulture Glass
Top 5 - yesterday
Top 5 - last week
- Workers safe after carbon monoxide incident at Windset Farms
- Hydropothecary announces expansion plans
- "With unemployment at record lows, labor is our biggest challenge"
- Australia: New project to drive agriculture innovation in Victoria
- Nominees for the 2018 Fruit Logistica Innovation Awards are announced
Top 5 - last month
- US (TX): Tarrant County College board approves campus greenhouse
- Partial replacement of PAR light by far red light in tomato
- NL: New Geothermal Energy Alliance in South Holland
- German Agricultural Society and Fairtrade enter strategic partnership in Africa
- US (ME): Aquaponic grower secures $1.6M to expand greenhouse
Exchange ratesmore »
Global warming potential, variable costs and water use of young plant productionIn a new study, the components for two production systems for young foliage plants in 72-count propagation trays were analyzed using life cycle assessment (LCA) procedures. The systems differed by greenhouse type, bench size and arrangement, rainwater capture, and irrigation/fertilization methods.
System A was modeled as a gutter-connected, rounded-arch greenhouse without a ridge vent and covered with double-layer polyethylene, and the plants were fertigated through sprinklers on stationary benches. System B was modeled as a more modern gutter-connected, Dutch-style greenhouse using natural ventilation, and moveable, ebb-flood production tables.
Inventories of input products, equipment use, and labor were generated from the protocols for those scenarios and a LCA was conducted to determine impacts on the respective greenhouse gas emissions (GHG) and the subsequent carbon footprint (CF) of foliage plants at the farm gate. CF is expressed in global warming potential for a 100-year period (GWP) in units of kilograms of carbon dioxide equivalents (kg CO2e).
The GWP of the 72-count trays were calculated as 4.225 and 2.276 kg CO2e with variable costs of $25.251 and $24.857 for trays of foliage plants grown using Systems A and B, respectively. The GWP of most inputs and processes were similar between the two systems. Generally, the more modern greenhouse in System B was more efficient in terms of space use for production, heating and cooling, fertilization, and water use.
While overhead costs were not measured, these differences in efficiency would also help to offset any increases in overhead costs per square foot associated with higher-cost, more modern greenhouse facilities. Thus, growers should consider the gains in efficiency and their influences on CF, variable costs (and overhead costs) when making future decisions regarding investment in greenhouse structures.
Access the full study at HortScience.
Publication date: 11/24/2017
Other news in this sector: