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Table 1 Water quality and nutrient levels in a multiple-reservoir water recycling system at the time of sampling

From: Seasonal dynamics of cyanobacteria and eukaryotic phytoplankton in a multiple-reservoir recycling irrigation system

Season (date)

Reservoiry

Water qualityz

Nutrient level

Chla (μg/L)

DO (mg/L)

EC (μS/cm)

pH

Temp (°C)

Turb (NTU)

NH4

NO3

NO2

PO4

(mg/L)

Springx (4/11/12)

VA10

0.55

8.58

243.00

5.40

12.28

3.90

0.29

7.42

0.09

< 0.01

VA11

24.30

9.07

437.33

6.32

16.42

52.10

5.18

12.07

0.09

1.76

VA12

32.90

9.49

252.00

6.65

18.08

7.7

2.54

5.17

0.09

0.69

VA13

2.5

9.85

192.93

7.46

17.60

45.3

0.29

0.46

0.09

0.01

Summer (7/16/12)

VA10

0.70

6.79

241.67

5.87

20.75

3.60

0.29

25.78

0.11

0.09

VA11

23.60

6.20

741.33

6.12

28.95

17.00

0.65

165.52

0.81

18.92

VA12

31.40

10.40

328.33

7.75

29.85

2.17

0.48

50.31

1.79

6.56

VA13

3.71

10.39

311.00

10.3

29.66

17.02

0.29

0.15

0.09

0.09

Fall (10/1/12)

VA10

0

8.11

244.00

6.02

17.32

2.60

0.29

39.42

0.09

0.09

VA11

26.73

5.83

343.67

6.65

19.92

6.20

1.16

86.82

1.72

15.64

VA12

51.07

7.38

230.00

7.22

22.35

14.57

0.29

41.8

0.66

8.14

VA13

24.87

7.06

181.33

9.42

21.63

76.07

0.29

0.09

0.09

0.09

Winter (1/22/13)

VA10

1.33

9.75

236.00

5.57

8.39

1.27

0.09

21.94

0.16

0.09

VA11

11.60

11.88

71.00

6.23

6.59

37.17

0.45

6.81

0.19

2.25

VA12

13.60

11.4

79.67

6.79

7.47

33.30

0.21

4.01

0.28

2.52

VA13

45.03

8.93

240.00

5.79

12.86

6.13

0.09

2.42

0.09

0.09

  1. xData has been published (Kong et al. 2017)
  2. yRunoff from production areas was channeled into VA11 which overflowed into VA12 then to VA13. VA10 was an independent small stream
  3. zWater quality reading at the time of sampling: Chla chlorophyll a, DO dissolved oxygen, EC electrical conductivity, Temp temperature, Turb turbidity