Agricultural irrigation water testing

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Testing standards

According to the farmland irrigation water quality standard (GB 5084-92)

Testing items

The water quality of farmland irrigation water should comply with the provisions of Table 1 and Table 2.

Table 1 Standard Values of Basic Control Items for Irrigation Water Quality in Farmland

S/N

Project Category

Crop Types

Aquatic

Dryland

Vegetables

1

Five Day Biochemical Oxygen Demand/(mg/L) ≤

60

100

40,15

2

Chemical Oxygen Demand/(mg/L) ≤

150

200

100, 60

3

Suspended solids/(mg/L)

80

100

60, 15

4

Anionic surfactants/(mg/L)

5

8

5

5

Water temperature/℃ ≤

25

6

pH

5.5-8.5

7

Total salt content/(mg/L)

1000 (non salt alkali)

8

Chlorides/(mg/L) ≤

350

9

Sulfides/(mg/L) ≤

1

10

Total mercury/(mg/L ≤

0.001

1l

Cadmium/(mg/L) ≤

O.01

12

Total arsenic/(mg/L) ≤

O01

0.1

O.05

13

Chromium (hexavalent)/(mg/L) ≤

O.1

14

Lead/(mg/L)

O2

15

Fecal coliform count/(number/100mL)

4 000

4 000

2 000, 1 000

16

Ascaris eggs/(number/L)

2

2, l

a Processing, cooking, and peeling vegetables

B Raw food vegetables, melons, and herbal fruits

For areas with certain water conservancy irrigation and drainage facilities that can ensure certain drainage and groundwater runoff conditions, or areas with certain freshwater resources that can meet the salt content in the washed soil, the total salt content index of farmland irrigation water quality can be appropriately relaxed

Table 2 Standard Values for Selective Control of Water Quality for Agricultural Irrigation Water

Sequence Number

Project Category

Crop Types

Water Cropping

Dry Farming

Vegetables

l

Copper/(mg/L) ≤

0.5

2

Zinc/(mg/L) ≤

2

3

0.02

4

Fluoride/(mg/L) ≤

2 (general regions), 3 (High fluorine area)

5

Cyanide/(mg/L) ≤

O.5

6

Petroleum/(mg/L) ≤

5

10

l

7

Volatile phenol/(mg/L) ≤

1

8

Benzene/(mg/L) ≤

2.5

9

Trichloroacetaldehyde/(mg/L) ≤

l

0.5

0.5

10

acrolein/(mg/L) ≤

0.5

ll

boron/(mg/L) ≤

1 (for boron sensitive crops) 2 (crops with strong boron tolerance) 3 (crops with strong boron tolerance)

a Boron sensitive crops, such as cucumbers, beans, sweet potatoes, bamboo shoots, chives, onions, citrus, etc

Crops with strong boron tolerance, such as wheat, corn, green pepper, Chinese cabbage, scallions, etc

Crops with strong boron tolerance, such as rice, radish, rapeseed, cabbage, etc

The discharge of treated aquaculture wastewater and industrial wastewater processed from agricultural products into farmland irrigation channels should ensure that the water quality downstream from the irrigation water intake point meets this standard

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BAIJIAN testing process:

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