LCA Food 2012 in Saint Malo, France! - Manifestations et colloques ...

PARALLEL SESSION 1C: ECODESIGN AND ENVIRONMENTAL MANAGEMENT 8 th Int. Conference on LCA in the
Agri-Food Sector, 1-4 Oct 2012
Table 1. Questionnaire summary of input data sheet, for reference and case study scenarios.
Tomato crop, multi- Tomato crop, Venlo Rose crop, Venlo
tunnel greenhouse glasshouse
glasshouse
Issue Input Units Case study Refer- Case study Refer- Case Referenceence
study ence
Crop Crop name Tomato Tomato Tomato Tomato Roses Roses
100
Yield produce·m
-2
20.0 kg·m -2* 16.5
kg·m -2
56.5 kg·m -2 56.5
kg·m -2
289
stem·m -2*
Density p·m -2 1.23 1.23 1.25 1.25 8.5 8.5
Stems per plant num- 2 2 2 2
ber·p -1
275
stem·m -
2
Growth period weeks 52 52 52 52 52 52
Substrate Type of substrate name Perlite Perlite Rockwool RockRockRockwoolwoolwool Substrate life span years 3 3 1 1 1 1
Bag volume l 30 30 14 14 6.42 6.42
Plants per bag number 3 3 3 3 3 3
Structure Number of spans number 10
data
*
18 25 25 21 21
Span width m 6 *
8 8 8 9.6 9.6
Span length m 60 * 135 200 200 200 200
Roof vents: total greenhouse
number
number 10 * 36
Gutter height m 4.0 * 4.5 6 6 6 6
Ridge height m 4.5 * 5.8 6.8 6.8 6.76 6.76
Greenhouse walls material LDPE * PC Clear glass Clear Diffuse
glass glass *
Clear
glass
Greenhouse frame life span years 15 15 15 15 15 15
Greenhouse roof covering life
span
years 3 3 15 15 15 15
Greenhouse walls life span years 3 * 15 15 15 15 15
Energy Total greenhouse electricity kWh·m
consumption
consumption
-2 0.641 0.641 10 10 633 633
Watering Water consumption L·m -2 475 475 795 795 902.5 902.5
Irrigation system open/closed type Open Open Closed Closed Closed Closed
Fertilisers N kg·m -2 0.050 * 0.060 0.1688 0.1688 0.1163 0.1163
P2O5 kg·m -2 0.035 * 0.038 0.04058 0.04058 0.0276 0.0276
K2O kg·m -2 0.135 * 0.117 0.18548 0.18548 0.128 0.128
Pesticides Fungicides kg·m -2 0.00285 0.00285 0.0007 0.0007 0.0036 0.0036
Insecticides kg·m -2 0.00038 0.00038 0.0003 0.0003 0.0006 0.0006
Heating Heating type No heating No heating
CHP CHP CHP CHP
Fuel none NO NO Natural gas Natural Natural Natural
gas gas gas
Fuel consumption m 3 ·m -2 0.00 0.00 42.1 * 64.7 101.7 101.7
*
Data in case study differing from reference situation
The indicators and impact categories selected for the environmental assessment were: the five midpoint
impact categories defined by the CML2001 method v.2.04 (Guinée et al., 2002), namely, abiotic depletion
(kg Sb eq), acidification (kg SO2 eq), eutrophication (kg PO4 -3 eq), global warming (kg CO2 eq) and photochemical
oxidation (kg C2H4 eq); one energy flow indicator (cumulative energy demand, MJ); and one inventory
flow indicator (water use, m 3 ).
In this study, the environmental calculator was used to analyse three case studies. Each case was a type of
production system that was compared with the corresponding reference production system. The main data for
each situation were included in Table 1. The first case study was for tomato crop in a smaller multi-tunnel
greenhouse with LDPE walls, a higher yield and lower doses of fertilisers. The second case was an energysaving
cultivation method for tomato crop in a Venlo glass greenhouse with 35% reduced heat demand and
the same yield. Finally, the third case study was rose crop in a greenhouse with diffuse glass, an antireflective
coating and a 5% higher yield.