Sustainable Greenhouse Production Saving Energy & Managing Water
What is Sustainable Greenhouse
Cultivation? Stuart Lambie, Sustainability Manager, GRODAN
Sustainable Greenhouse Production - Saving Energy & Managing Water.
Stoneleigh, January 29th 2014
What is Sustainable Greenhouse Cultivation?
• Measuring sustainability performance & identifying the key
sustainability “hotspots” in greenhouse cultivation
• Sustainability measurement in practice - the development
of sustainability measurement tools by The Sustainability
Consortium
What is Sustainable Greenhouse Cultivation?
• Measuring sustainability performance & identifying the key
sustainability “hotspots” in greenhouse cultivation
• Sustainability measurement in practice - the development
of sustainability measurement tools by The Sustainability
Consortium
Sustainability
Sustainability: Meeting the needs of the present without compromising
the ability of future generations to meet their own needs.
Protecting the environment, economic growth and social
development must be balanced.
Sustainable growing practices in greenhouse
horticulture will lead to economic benefits for your
business.
Definition adopted at the UN Conference on Environment and Development , Rio de Janeiro, 1992
Life Cycle Analysis (LCA):
The "Compilation and evaluation of the inputs, outputs and the
potential environmental impacts of a product system throughout
its life cycle" (ISO 14040, 1997).
LCA examines environmental aspects such as:
• Energy consumption
• Use of other raw materials
• Emission of hazardous substances
• Contamination of ground water, rivers and seas
• Use of agricultural land
Expressed as a score. The higher the score, the greater the impact on
the environment. Apart from the overall score, an LCA reveals the
“hotspots” which can be focus areas for improvement.
Measuring sustainability performance
using life cycle analysis (LCA)
End point score for greenhouse
tomatoes in The Netherlands
Share of the environmental impact of growing medium in year-
round cultivation of greenhouse tomatoes is less than 1%
Impact sources within each LCA impact category
Distribution of LCA impacts for a tomato crop in The Netherlands, 2011
What is Sustainable Greenhouse Cultivation?
• Measuring sustainability performance & identifying the key
sustainability “hotspots” in greenhouse cultivation
• Sustainability measurement in practice - the development
of sustainability measurement tools by The Sustainability
Consortium
What do The Sustainability Consortium do?
• informing decision makers on product sustainability across
the entire product lifecycle.
• creating sustainability-related knowledge about particular
product categories.
• continuously adding to the scope of products covered by
the Sustainability Measurement and Reporting System
(SMRS).
Mission
“Through multi-stakeholder collaboration, our mission is to design and
implement credible, transparent and scalable science-based measurement
and reporting systems accessible for all producers, retailers,
and users of consumer products”.
5. On-farm energy
efficient
management
practices and
technologies:
Reduce energy use
associated with
agricultural production
through methods
such as improved crop
varieties, improved
cropping techniques,
energy efficient
technologies, or
reduced transportation
on-farm.
Category Sustainability Profile: Tomatoes
Category Sustainability Profile: Tomatoes
12. Implement
practices for
greenhouse energy
efficiency: Adopt
practices and
technologies that
reduce energy use
by greenhouses.
This may include
energy efficiency
technologies and
efficient HVAC
systems as well as
favouring the use of
renewable energy.
7. Practices and
technologies that
reduce fertilizer run-
off: Adopt practices
and technologies
that reduce fertilizer
run-off. This may
include fertilizer use
efficiency, precision
fertilizer application
practices, or
irrigation
techniques.
Category Sustainability Profile: Tomatoes
Category Sustainability Profile: Tomatoes
13. Implement
programs, practices,
and technologies to
optimize irrigation
water use: increased
water use efficiency,
improved irrigation
technology,
precision irrigation,
water re-use and
recycling.
In conclusion…………
• Greenhouse cultivation which fully addresses “On-farm” energy use
as the sector’s biggest single sustainability “hotspot”
• Greenhouse cultivation which makes measurably more efficient use
of fertilisers and water to improve sustainability performance
• Greenhouse cultivation which addresses the sustainability concerns
of global food retailers:
– using academically developed measurement tools
– by addressing “hotspots” and “improvement opportunities”
What is Sustainable Greenhouse Cultivation?
Sustainable Greenhouse
Production
Saving Energy and Managing Water
Birmingham, 29th of January 2014
Aat Dijkshoorn
Programma Kas als Energiebron greenhouse as source of energy
Voor een krachtige klimaatneutrale glastuinbouw
What can you expect?
• Introduction KaE
• History of HNT- The New Way of Greenhouse Cultivation
• Knowledge transfer and interaction growers
• What’s next in HNT?
Ambitions towards 2020
• New greenhouses 2020 climate neutral
• Energy use in existing Greenhouses reduced by 50% cf 2010
Multiple strategies and solutions
Energy saving Sustainable energy Efficient Fossil CO2
Heat demand Light Solar energy Geothermal Biofuels
(bio CHP)
CHP Sustainable CO2
nutrition
Trias Energetics
Approach
R&D
Demonstration projects
Communication
Monitoring
& Evaluation
exploration
Solving problems
Results ultimo 2013
• Energy efficiency doubled cf 1990
• Geothermal Energy: 10 sites realised
• > 200 ha (semi-) closed greenhouses
• HNT: 5-10 m3/m2 savings
• Diffuse glass
• Starting new innovations:
– “Daylight Greenhouse, climateneutral
– VenlowEnergy Greenhouse (60% reduction heat demand)
– New dehumidifying options
– (Hybrid) LED options
What can you expect?
• Introduction KaE
• History of HNT- The New Way of Greenhouse Cultivation
• Knowledge transfer and interaction growers
• What’s next in HNT?
(Semi) closed greenhouses
• Summer cooling
• Less ventilation
• CO2 + fotosynthesis higher
• Use of storage in aquifer and
heating pump
Conclusions:
• Over taken by CHP
• Only economic when cooling is
needed
• Economics depend on prices
gas/elec
Nivolator: 4500 m3/hr
at 250 m2
V-FloFan: 5050 m3/hr
at 350 m2
vertifan: 3500 m3/hr
at 450 m2
Vertical air movement
Activities on HNT 2009-2013
• Demonstrations at GreenQ IC on 1.000 m2
• Monitoring on commercial scale
• Supporting development of technologies
• Growing concepts for more crops
• Subsidies on ATE’s + 2nd screens
New approach 2014
HNT – 0: More emphasis on energy saving in
common nurseries using the knowledge of
HNT
HNT – 1: ATE’s and 2nd screens
HNT – 2: more isolation, less respiration
=> climate neutral
What can you expect?
• Introduction KaE
• History of HNT- The New Way of Greenhouse Cultivation
• Knowledge transfer and interaction growers
• What’s next in HNT?
Definition HNT:
combination of knowledge from physics
and plants for optimal growth with
minimum of energy
Activities on knowledge transfer
• All results and backgrounds on website
• Research reviewed by growers committees
• Trade press
• Seminars and events
New:
• Small regional gatherings
• Study groups on HNT
– Combining theory + practice
– Using Let’s grow
HNT climate simulation tool
hnt.letsgrow.com/Hnt
What can you expect?
• Introduction KaE
• History of HNT- The New Way of Greenhouse Cultivation
• Knowledge transfer and interaction growers
• What’s next in HNT?
New research on HNT
Control of Humidity • lowering night + early morning evaporation
• effects compensation higher EC
• more equality in greenhouse climate
More isolation • double glass + AR coating
• new materials on screening: less heat emittence night, more light transmittance day
Use of latent heat • Heat pump
• Hygroscopic dehumidification
• Other alternatives
Emphasis on knowledge transfer
Large savings for some (new to built) greenhouses
Small savings for everyone add up to more results:
• More study groups to come
• Helpdesk on HNT
• More E-learning
• Continious monitoring
Thank You for your attention
www.energiek2020.nu
Aat Dijkshoorn
(+31) 681 613 617
1. Energy saving screen-types
2. Which screens to choose?
3. How to screen?
4. Climate under double screens
5. How much energy can be saved?
Agenda
1. Energy saving screen-types
Type
Direct light
(blew sky)
Diffuse light
(clouds)
Energy saving
XLS 10 REVOLUX 87% 80% 47%
XLS 10 ULTRA REVOLUX 85% 76% 47%
SLS 10 ULTRA PLUS 88% 81% 43%
- Double screen: energy saving is 63%
- H2no upgrade
Relative humidity
Humid, produced by the
plants, is transported
through the Svensson
screen.
Humid transport screen is of importance
H2no in practice
SLS10UP H2no SLS10UP
Photo’s are made in the morning, both screens were condensated
2. Which screen to choose?
Diffusity is an advantage in summer when a bit of light shading is needed. Example: Paprika, cucumber, strawberry, flowers and plants XLS 10 ULTRA REVOLUX
In case of no shading in summer Example: Tomatoes XLS 10 REVOLUX 4% extra Light
In case of double screen 2x XLS 10 REVOLUX XLS 10 REVOLUX + XLS 10 ULTRA REVOLUX
Option1:
XLS10 REVOLUX + XLS17 REVOLUX
Option2:
XLS10 REVOLUX + XLS 10 REVOLUX
Screens and “New way of Growing”
Energiesaving:
70% 47%
Energiesaving:
63% 63% en 47%
0
20
40
60
80
100
120
0:00 2:00 04:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00
Axis
Tit
le
Radiation in januar and screen closure
radiation
0
20
40
60
80
100
120
0:00 2:00 04:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00
Radiation in januar and screen closure
radiation
Screen 1, transparent
0
20
40
60
80
100
120
0:00 2:00 04:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00
Radiation in January and screen closure
radiation
Screen 1, transparent
screen 2, alu
0
20
40
60
80
100
120
0:00 2:00 04:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00
Sun radiation in January in Holland and screen usage
radiation
Screen 1, transparent
screen 2, alu
Screen 2, transparent
3. How to screen?
Winter:
• Open and closing of the energy screen?
• Screen gap for RH, HD?
Double screen:
• Which screen to open first?
Summer:
• Close at what radiation level?
• Screen gap
Blue line: RH under single screen (*) The New Growing
Yellow line: RH under double screen
Tomato, Relative Humidity under single and double screen (*) in closed position
0
1
2
3
4
5
6
7
8
VD afd 3
Blew line: HD under SLS 10 UP + fixed AC foil (*)
Yellow line: HD under XLS 10 REVOLUX + SLS10UP
Paprika, Humidity Deficit under single (*) and double screen in closed position
Screen hours in practice
0
500
1000
1500
2000
2500
3000
3500
4000
tomato XLS10REV tomato doubleHNT
paprika double paprika AC foil cucumber cucumber AC foil
screen hours
screen hours double
sceen hours day
How much energy can be saved?
tomato paprika cucumber
XLS 10 REVOLUX 10,9 m3 14,2 m3 14,2 m3
2 x XLS 10 REVOLUX 15,6 m3 19,9 m3 19,9 m3
New way of growing
22,3 m3
24,1 m3
24,1 m3
Peter Geelen Plantmonitoring.NL
81
More growth with less energy ?
Peter Geelen Plantmonitoring.NL
Tel : 06 – 33 852 838
E-mail : [email protected]
2014 UK Energy Event 29 january 2014
1 : More growth with less energy ?
Peter Geelen Plantmonitoring.NL
82
A :
you never can
reach the best
production and
quality with a
minimum use of
gas
B :
it is absolutely
possible to reach
a higher yield
with less gas
2 : saving of energy
Peter Geelen Plantmonitoring.NL
83
A :
the best way to
save energy is to
rase temperature
during the day
together and
decrease the
night temperature
B :
energy saving is
easier when you
can afford a
higher night
temperature
3 : saving of energy
Peter Geelen Plantmonitoring.NL
84
A :
energy saving
is easier in
week 1 t/m 15
B :
energy saving
is easier in
week 15 t/m 30
4 : releasing humidity
Peter Geelen Plantmonitoring.NL
85
A :
releasing
humidity is easier
with a closed
energy screen
B
you always
release humidity
better with an
open energy
screen
Peter Geelen Plantmonitoring.NL 86
10 gr / kg
20 °C
70 %
15 °C
95 %
Is export of
humidity
decreased ?
Absolute
Humidity
Humidity balance
Peter Geelen Plantmonitoring.NL
87
Humidity balance of a greenhouse
is best monitored by
AH : Absolute Humidity - gr / kg
Humidity balance
Peter Geelen Plantmonitoring.NL
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evaporation
condensation
ventilation
Background : humidity control and screening
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20 °C 20 °C
20 °C 12 °C
10 °C
Export of humidity
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By condensation
Temperature difference between
air temperature under the screen and glass temperature
By ventilation
Difference of AH in the glasshouse and outside the glasshouse
Results
Peter Geelen Plantmonitoring.NL
96
2012 2013 incl. CO2 production
screening hours 3425 4211 +786 hours + 23 %
gas m3 / m2 33,9 31,6 -2,3 m3 - 7 %
Extra monitoring tools
Peter Geelen Plantmonitoring.NL
97
Outside
Measuring humidity ( AH ) outside
Measuring emission of radiation with pyrgeo - meter
Above the screen
Measuring humidity ( AH ) + temperature above the screen
Under the screen
Measuring humidity + temperature at 3 levels in the crop
Experience in Holland
Peter Geelen Plantmonitoring.NL
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2013 : 10 – 15 growers
2014 : training for 100 growers
training for consultants
Precision Irrigation Doing more with less in a better way
Sustainable Greenhouse Production - Saving Energy &
Managing Water. Stoneleigh, January 29th 2014
The basic rules for irrigation
• Every irrigation results in a
vegetative plant reaction!
• Mistakes i.r.t a lower energy input
are made on the dark mild
(vegetative) days.
• Do not chase substrate EC.
• Drain should not be your “goal” but
the result of a structured irrigation
strategy.
• Control EC with a strong well
balanced crop & structured irrigation
strategy.
More
“Veg”
More
“Gen”
Range
Ec slab ↓ ↑ 2,5-8,0mS
Ec drip ↓ ↑ 2,0-4,0mS
1WC slab ↑ ↓ 45-80%
∆WC ↓ ↑ 6-15%
Start Earlier Later 0 / +3 hrs
SR
Stop Later Earlier 0 / -5 hrs
SS
1Dependant on substrate choice.
General steering parameters in the root zone
Delaying the moment of irrigation
for as long as possible results in
generative development Vegetative Generative
Max block
weight (g)
1560g 2840g
1560g 2840g
Min block
weight (g)
1360-390g 2540-585g
1250-280g 2375-420g
Minimum
WC%
65-70% 45-50%
Time between
irrigation
Shorter Longer
Ec irrigation
water
2,0-2,8mS 3,5-5,0mS
110 x 10 cm Plantop Delta block 210 x 15 cm Plantop Delta block
More “generative” nutrient schemes
are used
NO3 SO4 P Cl NH4 K Ca Mg Fe Mn Zn B Cu
17,2 5,0 1,0 0,0 0,0 6,1 7,4 3,66 16,1 10,7 5,38 43,0 0,01
Example: Target mMol-1 & µMol-1 tomato at EC 2,8mS
NO3 SO4 P Cl NH4 K Ca Mg Fe Mn Zn B Cu
17,2 5,0 1,0 0,0 0,0 6,1 7,4 3,66 16,1 10,7 5,38 43,0 0,01
-8,0
NO3 SO4 P Cl NH4 K Ca Mg Fe Mn Zn B Cu
17,2 5,0 1,0 0,0 0,0 6,1 7,4 3,66 16,1 10,7 5,38 43,0 0,01
-8,0 2,0 4,0
Your goal is exactly the same
• Controlled generative plant development &
good quality cluster development.
– Heads visible & higher than the rest of
the plant.
– Tight curling leaves already at midday.
– Dark green coloured leaves.
– Continued uniform growth of the
shoots & LAI.
• General rule-of-thumb:
– 1st cluster flowering <15/1 pre-planting
– 1st cluster >15/1 direct to slab.
Pre-planting phase
• How long beside the plant
hole?
• “Norm” for slab contact when
2nd cluster is starting to flower.
• Length of pre-planting period
depends on block size & type.
– keep control of the irrigation
– increasingly 10 x 15 cm blocks
– make slab contact when you give
450-550ml/block/24hrs.
Part-draining the slab & planting
directly
Control of substrate WC.
Slab EC 4,0 - 5,0 mS.
Even gutter profile.
Well rooted block.
Generative plant material.
Good interaction WC over height of block / slab
Irrigation strategy– Phase 1 & 2 Maximum vegetative effect irrigate after midday
Maximum generative effect irrigate at night
Acceptance of lower humidity deficits highest humidity at night & lowest (plant) temperature in
pre-night
Precision irrigation creating resilient plants as well as steering plant
balance & cluster quality
Survey (WUR) of 100 Dutch tomato growers
found a strong link between water applied in
first 8 weeks of the cultivation and subsequent
incidence of Botrytis infection.
Precision irrigation when thinking what is an acceptable EC?
Radiation
(W/m2)
EC substrate
Tomato
EC substrate
Cucumber
EC substrate
Pepper
200 8,0 5,0 6,0
400 6,0 4,0 5,0
600 5,0 3,5 4,0
800 4,0 3,2 3,5
1000 3,5 2,8 3,0
Drain hole configuration & EC
control
Irrigated volume
The quality and position of the drain
hole will affect the functionality (WC
& EC) of the substrate.
Precision irrigation drain is not the goal but should be a result of a
structured irrigation strategy
Max radiation
W/m2
Radiation sum
J/cm2
Traditional
drain %
Precision
Growing drain %
200 500
20-30% 400 1000
600 1500
30-60%
800 2000
1000 2500
Max radiation
W/m2
Radiation sum
J/cm2
Traditional
drain %
Precision
Growing drain %
200 500
20-30%
5%
400 1000 10%
600 1500
30-60%
15%
800 2000 20%
1000 2500 25%
Nutrient balance
• As the fruit load increases in
Phase 3 (week 12 – 18) & you
work with:
– low volumes of applied
irrigation.
– low drain volumes
– combined with recycling
nutrient solution
• In line with emission
reduction!
• BE AWARE OF THE NUTRIENT
BALANCE IN THE ROOT ZONE
Structured irrigation strategy leads to
a stable root zone environment
Low stable WC and high stable
EC: Phase 2/3 (Generative)
High stable WC and low stable
EC: Phase 4/5 (Vegetative)
EC EC WC WC
Summary
• Irrigation results in a vegetative plant reaction
– in line with energy management steer as “generative” at the start of
the crop.
• Generative steering within the root zone starts in propagation
– do not view propagation and production as two separate cultivations.
• Whatever your planting date your goal is to continue controlled uniform
generative plant development.
– set targets for WC & EC
– monitor & keep control.
• Be critical on dark days, accept higher EC levels in the substrate and
above all do not over supply water by chasing substrate EC.
© DLV Plant
Effcient use of energy in a tomato crop
• History – “Low” energy price.
– Early production at high price level.
– Ungrafted plants.
• Planning crop – Planting date => end of the crop
– Options of insolation
– Planting material
– Energy available => planning input energy
– How to do it?
© DLV Plant
Planning of the crop
• Early planting date – Fruitload in January => low 24 H-Temp needed
– RH difficult steering with low Temperature
– Productspecifications and demand from market.
– Cropchange in November
• Later planting date – High 24 T demand at start of the crop => insolation usefull
– Growing with increasing light level
– Keep the crop healthy to the end => energy uptake.
– Cropchange in late December.
© DLV Plant
Planting material => saves energy
62 days plant. Grafted and
pinched at second leave.
First flower at 68 days.
© DLV Plant
Planting material => energy intensive
Grafted single head.
Needs 2 weeks in house to
first flower.
First truss at leave nr. 12
© DLV Plant
Planning energy consumption
• Energy savings options – Movable screen
– Combination AC foil
• Speed of the crop. – Result of energy input ( fixed max pipe ) and insolation of
the glasshouse and outside temperature.
– The growers is restricted.
• Planning energy – Become conscious of the possible options
– Planning 2014
• Normal glasshouse; one screen.
-
0,20
0,40
0,60
0,80
1,00
1,20
1,40
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
-
5,00
10,00
15,00
20,00
25,00
30,00
35,00
Weekly
consumption
Cumulative 2014
24 H Temp
© DLV Plant
Climate control
• Temporarily accept a less optimum situation
=> focus on long term.
• Pre-night aggressive => root pressure to
wounds of leaf cutting?
• Steady appraoch is energy friendly.
© DLV Plant
heating setpoint
10,0
15,0
20,0
25,0
30,0
0 1 2 2 3 4 5 5 6 7 8 8 9 10 11 11 12 13 14 14 15 16 17 17 18 19 20 20 21 22 23 23 24
time
tem
pe
ratu
re
Work on balance
Appearance of the crop
Day length => 24 hr T
nor
mal
light
increase
A 24h 17,4 18,4
A N 15,9 16,3
A D 19,4 21,5
© DLV Plant
24 Temperature versus Light
• Basic need of the crop 100 Js/cm
• Fruitload 100 Js/cm a full set truss
• Basic 24 T => Beef 17,5 C
=> Classic 17 C
• Light increase => 300 Js/cm for 1 C
• Example => 600 Js lightlevel
3 trusses => 300 Js
Crop => 100 Js
Left over => 200 Js => 17 + 0,6
Correction to stem distance and light transmission
glasshouse
© DLV Plant
Improve energy efficiency
• Equal temperatures in the house; horizontal and vertical.
– Improve knowledge => use measuring equipment
– Air movement needed
• by pipe?
• force ventilation
• Crop type – Higher dry matter => “hard crop type”
– how:
• CO2
• EC and adjustment to fertilisation
– Open crop type LAI under control
• Expose 2 leaves a truss
• Variety choice
• De-leafing strategy
© DLV Plant
New view on set point min pipe
• Only use min pipe when needed – Keeping constant 30 or 35oC during day and night => energy slips away!
• Example – Basic pipe is air temp => so no pipe needed => set point 0oC
– At RH from 87% til 90% + 50oC
– So 87% => no min pipe
– 90% => 50oC min pipe
• I.C.W. min vent
– Calculated pipe < 40oC => min vent 1-3%
– Calculated pipe > 42oC => min vent 0%
– Creates an “open climate”
© DLV Plant
Suitable applications
• Accept humidity deficit < 2.0 gm3
– In day one also < 1.0 gm3 measured
– Correct in day two
• Grow a powerful crop => in balance
• Sensitivity Botrytis – Crop with dry matter content ( so dark green appearance)
– EC drip adjust to cooling and growth
• Weather conditions change to cool => increase EC drip
• Extra attention for hygiene and performance of crop
work – When raining no leaf cutting or truss scratching
© DLV Plant
Results from 2001
• Change of variety.
• Use of grafted plants.
• Change of the planting date.
• Change of planting material.
• EC level from 3 to 5 in the slab.
• Min drip 2,8 EC; at the start 4 EC.
• Focus on energy; daily measuring uptake.
• High performance of the cropwork.
• IN 10 years + 12 kg and minus 15 m3 gas.
© DLV Plant
Yield (Kg/m2) and energy input (m3 gas) for a Dutch tomato
greenhouse with standard boiler & pipe rail system
• How much of today’s information are you already applying?
• How much could you apply?
• What’s stopping you using it?
Some questions?
• CO2
– How much do you need?
– Can you get it from gas?
– Alternative sources?
– How & when should you use it?
Other Technical Areas?