Comparions of Different Nutrient Management in Hydroponic and Freshwater Aquaponic Systems

18 Pages·2016·1.56 MB·English

by  Valentina Nozzi

Nozzi Valentina, Graber Andreas, Mathis Alex, Schmautz Zala, Junge Ranka
International conference “Aquaponics research mattes”
Ljubljana, 22-24 March 2016
 Some nutrients from the aquaculture effluents are present in insufficient quantities
for plants development
 In some cases nutrients ought be supplemented to the aquaponic system to ensure
optimal performance of the plants
 However, the addition of fertilizers increases the managerial and economic effort
  Investigate the role of nutrients in order to optimize cost and management in
the aquaponics production
Zurich University of Applied Sciences / Life Sciences and Facility Management (Zurich, CH)
Introduction
Aquaponics (3 systems):
• Fish tank
• Drum filter
• Biofilter
Sump
• solids thickening unit
• Hydroponic unit (3
tables, 1.2 m x 2 m each)
• Total water volume of Hydroponic unit
each system: 4,400 L.
HYDROPONICS
Hydroponics (1 reference):
• Hydroponic unit (3 tables,
1.2 m x 2 m each)
• Two sump (630L)
AQUAPONICS
Material & method
72 mushroom herbs 72 mints 36 Lettuces
(Mentha piperita (Lactuca sativa YACHT
(Rungia klossii)
CHOCOLATE variety) variety (Salanova®))
50 Nile tilapia
(Oreochromisniloticus)
Material & method
-
Aquaponic Aquaponic Aquaponic Hydroponic
A B C D
HYDROPONIC SOLUTION:
• Fish feed
Nutrients derived solely • Fish feed • Micronutrient (Zn, B,
• Micronutrient (Zn, B,
from FISH FEED, no • Micronutrient (Zn, B, Mg, Mo, Cu, Fe)
Mg, Mo, Cu, Fe)
supplementation Mg, Mo, Cu, Fe)
• Iron
• Iron
• Iron
• Macronutrients (P, K) • Macronutrient (P, K)
• Nitrogen (NO , NH )
3 4
• Ca
Nutrients, cost and management effort
Material & method
The experimentation ended when plants reached the
commercial size, 4 weeks after the beginning
Material & method
 Total Biomass  Flavonols (Flv)
 Final biomass
 NO -N  t°
3
 Fresh shoot weight  Nitrate content
 Specific growth rate  TN  pH
 Fresh rootweight  Organic Matter  PO4-P  EC
 feed conversion ratios
 K  O
2
 Root/shoot ratio  CHN-elemental analysis  Fe
 Ca
 Chlorophyll content (Chl)
 Mg
 Epidermal UV-absorbance (Flv)  °dH
Material & method
NO3-N TN
120 120
A A
100 B B
100
C C
L/g 80 D L/g 80 D
m m
60
60
40
40
8 11 14 17 20 23 26 14 17 20 23 26
days days
PO -P K
4
40 200
A A
B B
30 150
C C
L D L D
/g 20 /g 100
m m
10 50
0 0
8 11 14 17 20 23 26 8 11 14 17 20 23 26
days days
Fe Mg
NO3-N TN
4 60
120 120 A A
A A B 50 B
100 B 100 B 3 C 40 C
C C
L D L D
g/L 80 D g/L 80 D /gm 2 /gm 30
m m
20
60
1
60
10
40
40 0 0
8 11 14 17 20 23 26 14 17 20 23 26 8 11 14 17 20 23 26 8 11 14 17 20 23 26
days days days days
PO4-P K Ca °dH
40 200 150 40
A A A A
B B
30 C 150 C 125 B 30 B
C C
L D L D
mg/ 20 mg/ 100 L/g 100 D L/g 20 D
m m
10 50 75
10
0 0 50
8 11 14 17 20 23 26 8 11 14 17 20 23 26 0
days days 8 11 14 17 20 23 26 8 11 14 17 20 23 26
days days
Fe Mg
4 60
A A
B 50 B
3
C C
40 Results
L D L D
g/ 2 g/ 30
m m
20
1
10
0 0
8 11 14 17 20 23 26 8 11 14 17 20 23 26
days days
Ca °dH
150 40
A A
B B
125 30
C C
L D L D
g/ 100 g/ 20
m m
75
10
50
0
8 11 14 17 20 23 26 8 11 14 17 20 23 26
days days
Date / Duration Parameters Tank A Tank B Tank C
Number of fish 50 50 50
04.05.2015 Total weight (kg) 12.4 10.8 11.3
Average weight per fish (kg) 0.25 0.22 0.23
Number 49 50 50
30.06.2015 Total weight (kg) 24.1 21.0 24.2
Average weight per fish (kg) 0.49 0.42 0.48
Specific growth rate (%/d) 1.20 1.17 1.33
57 days
Feed conversion ratio (kg /kg ) 1.25 1.49 1.16
feed fishbiomass
Results
Lactuca sativa Mentha piperita Rungia klossii
A B C D A B C D A B C D
Total n. of plants 36 36 36 36 72 72 72 72 72 72 72 72
n. of no-saleable plants 1 / / / 6 / / / / / / /
n. of plants harvested 35 36 36 36 66 72 72 72 72 72 72 72
Total biomass (fresh) kg 9.2 10.6 13.5 12.4 7.7 11.6 10.5 9.9 1.31 1.25 0.76 0.98
Shoot (fresh) kg 8.0 9.8 12.3 11.3 5.7 9.5 9.0 8.7 0.67 0.66 0.43 0.53
Roots (fresh) kg 1.2 0.8 1.2 1.1 2.0 2.1 1.6 1.2 0.64 0.58 0.33 0.44
Average shoot weight g 222 272 341 314 79 132 124 120 9.3 9.2 6.0 7.4
Production (shoot) kg/m2 4.0 4.9 6.1 5.7 3.1 4.8 4.5 4.3 0.34 0.33 0.21 0.27
Results