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buds are swelling
Latitude | 45.499011°
Longitude | 15.55176°
Elevation | 112.5m
tree height: 20,17m
circumference: 200 cm

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buds are swelling
Latitude | 45.5069°
Longitude | 15.4992°
Elevation | 209.0m
tree height: 17,55m
circumference: 150 cm

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covered with snow

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budburst 28/2/2021

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budburst 1/3/2021

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leaf1: 12mm leaf2: 6mm leaf3: 3mm leaf4: 9mm

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leaf1: 10mm leaf2: 11mm leaf3: 14mm leaf4: 11mm

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leaf 1: 17mm leaf2: 19mm leaf3: 19mm leaf4: 18mm

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leaf 1: 14mm  leaf2: 6mm   leaf3: 3mm    leaf4: 9mm

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leaf 1: 30mm  leaf2: 32mm   leaf3: 33mm    leaf4: 31mm

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leaf 1: 30mm  leaf2: 14mm   leaf3: 17mm    leaf4: 12mm

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Birch covered with snow; 19 cm snow

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Leaf1  49 mm       Leaf2   51 mm    Leaf3   52 mm      Leaf4    48 mm

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Leaf1  39 mm       Leaf2   25 mm    Leaf3   25 mm      Leaf4    19 mm

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Dubovac,Elementary school, Karlovac, Croatia
Birch tree
location 45.4916, 15.5376
tree high:18,5 m , circumference: 119 cm

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Leaf1  42 mm       Leaf2   35 mm    Leaf3   30 mm      Leaf4    25 mm

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Leaf1  54 mm       Leaf2   55 mm    Leaf3   58 mm      Leaf4    54 mm

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Dubovac, Elementary school, Karlovac , Croatia

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Dubovac, Elementary school, Karlovac , Croatia

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Birch tree
February 19th
All the buds dormant. Temperature 15C

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Dubovac, Elementary school, Karlovac , Croatia

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Dubovac, Elementary school, Karlovac , Croatia

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Birch tree
March, 4th, temperature: 17C
All the buds budburst.

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Dubovac, Elementary school, Karlovac , Croatia

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Dubovac, Elementary school, Karlovac , Croatia

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BIrch tree
March , 10th, temperature 9C
Observing leaves:
1. leaf: 1mm. 2leaf: 2, 3.leaf: 1mm, 4.leaf:2mm

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Dubovac, Elementary school, Karlovac , Croatia

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Dubovac, Elementary school, Karlovac , Croatia

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BIrch tree
March , 19th, temperature 8C
Observing leaves:
1. leaf: 5mm. 2leaf: 7mm , 3.leaf: 6mm, 4.leaf:6mm

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Dubovac, Elementary school, Karlovac, Croatia

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Dubovac, Elementary school, Karlovac, Croatia

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BIrch tree
April, 1st, temperature 22 C
Observing leaves:
1. leaf: 12mm. 2leaf: 15mm, 3.leaf: 15mm, 4.leaf:14mm

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Dubovac, Elementary school, Karlovac, Croatia

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Dubovac, Elementary school, Karlovac, Croatia

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BIrch tree
April 7th, temperature 6C
Observing leaves:
1. leaf: 29mm. 2leaf: 31, 3.leaf: 31mm, 4.leaf:32mm

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Dubovac, Elementary school, Karlovac, Croatia

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Dubovac, Elementary school, Karlovac, Croatia

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BIrch tree
April , 14th, temperature 9C
Observing leaves:
1. leaf: 48mm. 2leaf: 51, 3.leaf: 51mm, 4.leaf:50mm

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Dubovac, Elementary school, Karlovac, Croatia

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Dubovac, Elementary school, Karlovac, Croatia

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BIrch tree
April , 23th, temperature 14C
Observing leaves:
1. leaf: 51mm. 2leaf: 56, 3.leaf: 56mm, 4.leaf:54mm

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Dubovac, Elementary school, Karlovac, Croatia

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Dubovac, Elementary school, Karlovac, Croatia

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Observing in the school park. March 20th
Recording video for University of Science, Biology department, Department of teacher education, Zagreb

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Dubovac, Elementary schol, Karlovac, Croatia

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Dubovac, Elementary schol, Karlovac, Croatia

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BIrch

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birch1

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birch2

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Dubovac, Elementary school, Karlovac , Croatia

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Dubovac, Elementary school, Karlovac , Croatia

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BIrch tree
February 26th, temperature: 18,5C
All the buds swaled.

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Dubovac Elementary school , Karlovac, Croatia

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Dubovac Elementary school , Karlovac, Croatia

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BIrch tree
February 26th, temperature: 18,5C
All the buds swaled.

# data[].attributes.headline
Dubovac Elementary school, Karlovac, Croatia

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Dubovac Elementary school, Karlovac, Croatia

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BIrch tree
April 7th,  curent temperature: 8 C, minimum temperature: -5C
Some leaves are snow covered
lenght of leaves: 1. 29mm, 2. 31 mm, 3. 32mm , 4. 32mm

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Dubovac Elementary school, Karlovac, Croatia

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Dubovac Elementary school, Karlovac, Croatia

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Birch tree
May 5th , current temperature:  19 C
lenght of leaves : 1. 51 mm, 2. 56mm,  3. 56 mm, 4. 54mm
and this is final lenght. The leaves dont grow any more.

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Our classroom activities- the process of photosynthesis

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plant cell

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The leaves dont grow any more.
Leaf1  57 mm       Leaf2   50 mm    Leaf3   46 mm      Leaf4    42 mm

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Leaf1  57 mm       Leaf2   50 mm    Leaf3   46 mm      Leaf4    42 mm
The leaves stopped growing.

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The leaves dont grow any more.
Leaf1  63 mm       Leaf2   63 mm    Leaf3   64 mm      Leaf4    42 mm

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The leaves dont grow any more.
Leaf1  63 mm       Leaf2   63 mm    Leaf3   64 mm      Leaf4    42 mm

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The Birch with stem circumference of 200 cm is approximately 76 years old.
The Birch with stem circumference of 150 cm is approximately 57 years old.
C and biomass calculation:

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The birch with stem circumference of 119 cm is approximately  45 years old.
C and biomass calculation

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2021.may 28th
After may 5th , the leaves were not grow.

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1.2.2021.-20.5.2021.

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1.2.2021.-20.5.2021.

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1.2.2021.-20.5.2021.

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Comparative graph for soil temperature 10 cm

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Comparative graph for soil temperature 10 cm

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1.2.2021.-20.5.2021.

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Birch Locations
OŠ Banija                                OŠ Banija                                       OŠ Dubovac
birch1                                        birch2                                           Birch tree
Latitude | 45.499011°             Latitude | 45.5069°                    Latitude 45.4916
Longitude | 15.55176°             Longitude | 15.4992°                Longitude15.5376
Elevation | 112.5m                   Elevation | 209.0m                     Elevation | 111.0m