Plant development and fruit quality of European
blueberry (Vaccinium myrtillus), at different
climatic growing conditions in Norway.
Rolf Nestby, Inger Martinussen, Arnfinn Nes,
Nina Opstad & Jens Rohloff
Areas involved in investigations on V.
myrtillus
Continuous light. Accumulated production of
berries at 12C and 18C. Southern clones: ♦ S1, ■ S2;
Northern clones: ▲ N1, × N2
18◦C, 24 h light
16
S1
14
S2
N1
12
Berry weight (g)
Berry weight (g)
12◦C, 24 h light
25
S1
S2
20
N1
N2
N2
10
15
8
10
6
4
5
2
0
0
28 30 35 38 43 49 52 56 63
28 30 35 38 43 49 52 56 63
Short day. Accumulated production of
berries at 12C and 18C. Southern clones: ♦ S1, ■ S2;
Northern clones: ▲ N1, × N2
18◦C, 12 h light
35
S1
S2
30
N1
Berry weight (g)
Berry weight (g)
12◦C, 12 h light
25
S1
S2
20
25
N1
N2
N2
15
20
15
10
10
5
5
0
0
28
28
30
35
38
43
49
52
56
63
30
35
38
43
49
52
56
63
Effekt of NP fertilization on fruit yield in
kg haa-1 of V. myrtillus
Fertilizer
Year
N - P
2008
2009
0
0
171
178
175
30 - 20
119
243
181
30 - 40
151
332
242
60 - 40
138
125
132
Mean
145
220
183
M. error
38ns
59ns
27ns
-
2010
Mean
Summary
• Ripening began generally earlier by N clones at all tested
conditions (S2 commenced similar as N1 at low T).
• Fruit yield at continuous light was generally higher for N clones
compared with S clones at both low and high T (S2 accumulated
similar as N2 at high T)
• Fertlization in a forest field giving 30 kg N and 40 kg P per
hectar gave higher fruit yield than no and higher fertilizer.
• Antioxidant levels were generally higher in the two northern than
in the southern region.
• Contents of soluble solids and titratable acid showed no clear
trend on the axis north-south. Existing differences were related
to site.