Article. Energy in fokus - from Kyoto to Copenhagen. - AgroTech

agrotech.dk

Article. Energy in fokus - from Kyoto to Copenhagen. - AgroTech

Liisa Särkkä, Eeva-Maria Tuhkanen, Tiina Hovi-Pekkanen and Risto Tahvonen

Improving productivity of cucumber,

tomato and cut rose in semi-closed

greenhouse in Finland

Improving

M

productivity of cucumber, tomato and cut rose in semi-closed greenhouse in Finland

TT Agrifood Research Finland, Plant

Liisa Särkkä, Production Eeva-Maria Research, Tuhkanen, Toivonlinnan- Tiina Hovi-Pekkanen and Risto Tahvonen

tie 518, 21500 Piikkiö, Finland, e-mail

MTT liisa.sarkka@mtt.fi Agrifood Research Finland, Plant Production Research, Toivonlinnantie 518, 21500 Piikkiö,

Finland, Despite e-mail the good liisa.sarkka@mtt.fi

light environment for

plants, a year-round greenhouse produc-

Despite tion suffers the good from lower light environment yields in summer for plants, a year-round greenhouse production suffers from

lower than during yields the in other summer times than of the during year. Tra- the other times of the year. Traditional climate control in the

greenhouse ditional climate with control roof vents in the is greenhouse not sufficient and this weakens growth factors. A new cooling system

was

with

developed

roof vents

allowing

is not sufficient

the roof

and

vents

this

to be closed most of the time. Therefore carbon dioxide

concentration could be kept high and both air temperature and air humidity could be controlled in

weakens growth factors. A new cooling

a proper way.

system was developed allowing the roof

Cultivation vents to be trials closed were most made of the with time. cucumber, The- tomato and cut roses. In semi-closed greenhouse the

yield refore of carbon cucumber dioxide increased concentration in the could first summer by 24 % and in the second summer by 40 % compared

be kept to the high traditional and both climate air temperature control (Fig. 1). The reduced need for ventilation in semi-closed

greenhouse and air humidity allowed could maintaining be controlled of in constant a higher CO2 concentration (cucumber average 1000

ppm, proper tomato way. and cut rose 700-800 ppm) than in traditional greenhouse (cucumber and cut rose

average Cultivation 400 ppm, trials tomato were 500 made ppm) with (Fig. 2). In semi-closed greenhouse, the summer yield (weeks

23-35) cucumber, of tomato and was increased cut roses. In while seminot

the spring yield (weeks 13-22). The yield quality of cut

roses closed was greenhouse improved the but yield not of the cucumber number of flowers compared to traditional greenhouse. All trials

were increased illuminated in the first year summer round by by 24 HPS % and lamps. Moreover, tomato had 31% interlighting of 170 W/m

in the second summer by 40 % compared

to the traditional climate control (Fig.

1). The reduced need for ventilation in

2

Fig 2. 2. Climate for for cucumber in in the the semi-closed (cooling) (cooling) greenhouse greenhouse and in and the traditional in the greenhouse

traditional

(control)

greenhouse

in August

(control)

as mean values

in August

of each

as mean

hours of

values

the days.

of each hours of the days.

semi-closed greenhouse allowed maintai- greenhouse (cucumber and cut rose ave-

installed lights.

ning of constant higher CO concentration rage 400 ppm, tomato 500 ppm) (Fig. 2).

2

(cucumber average 1000 ppm, tomato and In semi-closed greenhouse, the summer

Photosynthesis measurements showed that plants benefited from high carbon dioxide concentration.

The plant structure was also affected by

cut

the

rose

semi-closed

700-800 ppm)

greenhouse

than in traditional

environment.

yield (weeks 23-35) of tomato was increased

while not the spring yield (weeks

Further trials are needed to optimize the greenhouse climate. Our cooling system makes 13-22). it possible The yield quality of cut roses was

to find out the most beneficial climates to each plant species for optimal production. improved but not the number of flowers

compared to traditional greenhouse. All

trials were illuminated year round by HPS

lamps. Moreover, tomato had 31% interlighting

of 170 W/m2 installed lights.

Photosynthesis measurements showed

that plants benefited from high carbon

dioxide concentration. The plant structure

was also affected by the semi-closed

greenhouse environment.

Further trials are needed to optimize the

greenhouse climate. Our cooling system

makes it possible to find out the most

beneficial climates to each plant species

for optimal production.


Fig 1. Yield of cucumber in semi-closed (cooling) greenhouse and traditional roof

Fig 1. Yield of cucumber in semi-closed (cooling) greenhouse and traditional roof ventilated

ventilated greenhouse (control). Summer yield in the first year was from 12 weeks

greenhouse (control). Summer yield in the first year was from 12 weeks and second year from 14

and second year from 14 weeks. The lower case shows statistical difference of the

weeks. The lower case shows statistical difference of the same classes in different treatments. Block

letters same classes show difference in different between treatments. total Block yields. letters show difference between total yields.

42 ENERGY IN FOCUS

More magazines by this user
Similar magazines