Skip to main content

Table 1 Total surface loading of N in areas served by agricultural wells

From: Assessment of nitrate-N contamination in the Chunnakam aquifer system, Jaffna Peninsula, Sri Lanka

Agro well

Crop type

Area (sq.m)

Total N-load (kg)

C2

   
 

Onion

1764

35

 

Pumpkin

1764

25

 

Tobacco

1764

175

D1

   
 

Onion

3528

164

D2

   
 

Beet root

441

330

 

Onion

441

10

 

Pumpkin

882

14

 

Tobacco

1323

43.75

 

Tomato

441

13.75

D5

   
 

Amarathus

504

1

 

Beans

504

1

 

Cassava

2016

175

 

Snake gourd

504

0

D6

   
 

Beet root

3326.4

358.25

 

Chilli

2520

56.25

 

Onion

1260

33.125

E2

   
 

Beet root

3528

130

 

Onion

441

13.75

E5

   
 

Beet root

2419.2

226.5

 

Onion

604.8

7.2

 

Tobacco

1209.6

150

E6

   
 

Banana

2016

100

F5

   
 

Banana

1008

0

 

Leeks

403.2

7.5

 

Onion

604.8

106.3

 

Tobacco

1008

15

G4

   
 

Beet root

4032

86

 

Onion

504

0

 

Tobacco

2016

140

G5

   
 

Onion

6753.6

493.1

NW1

   
 

Banana

1512

75

NW10

   
 

Tobacco

2016

268

NW2

   
 

Banana

2520

 
 

Onion

2016

240

NW3

   
 

Banana

2520

250

 

Beet root

1008

15

NW4

   
 

Banana

1209.6

0

 

Cabbage

1209.6

63

 

Pumpkin

1209.6

8.4

NW5

   
 

Amarathus

705.6

3.5

 

Onion

604.8

7.5

 

Tobacco

1512

217.5

NW8

   
 

Cassava

2016

50

NW9

   
 

Capsicum

504

0

 

Chilli

504

0

 

Tobacco

2520

193.75

 

Total

73117.8

4302.125