Salinity Hazard of Irrigation Water for Various Crops |
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Yield Decrement Expected from ECw* Value of Irrigation Water Shown in Table |
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Crop |
0% |
10% |
25% |
50% |
Maximum ECw** |
|
Alfalfa |
1.3 |
2.2 |
3.6 |
5.9 |
10.0 |
|
Barley*** |
5.3 |
6.7 |
8.7 |
12.0 |
19.0 |
|
Bermuda grass |
4.6 |
5.7 |
7.2 |
9.8 |
15.0 |
|
Clover |
1.0 |
1.6 |
2.4 |
3.8 |
6.6 |
|
Corn |
1.1 |
1.7 |
2.5 |
3.9 |
6.7 |
|
Cotton |
5.1 |
6.4 |
8.4 |
12.0 |
18.0 |
|
Field bean |
0.7 |
1.0 |
1.5 |
2.4 |
4.2 |
|
Flax |
1.1 |
1.7 |
2.5 |
3.9 |
6.7 |
|
Grape |
1.0 |
1.7 |
2.7 |
4.5 |
7.9 |
|
Meadow foxtail |
1.0 |
1.7 |
2.7 |
4.5 |
7.9 |
|
Onion |
0.8 |
1.2 |
1.8 |
2.9 |
5.0 |
|
Orchard grass |
1.0 |
2.1 |
3.7 |
6.4 |
12.0 |
|
Pepper |
1.0 |
1.5 |
2.2 |
34. |
5.8 |
|
Perennial ryegrass |
3.7 |
4.6 |
5.9 |
8.1 |
13.0 |
|
Potato |
1.1 |
1.7 |
2.5 |
3.9 |
6.7 |
|
Rice |
2.0 |
2.6 |
3.4 |
4.8 |
7.6 |
|
Safflower |
3.5 |
4.1 |
5.0 |
6.6 |
9.7 |
|
Sorghum (milo) |
2.7 |
3.4 |
4.8 |
7.2 |
8.7 |
|
Soybean |
3.3 |
3.7 |
4.2 |
5.0 |
6.7 |
|
Sudan grass |
1.9 |
3.4 |
5.7 |
9.6 |
17.0 |
|
Sugarbeet*** |
4.7 |
5.8 |
7.5 |
10.0 |
10.0 |
|
Tall fescue |
2.6 |
3.9 |
5.7 |
8.9 |
7.8 |
|
Tall wheatgrass |
5.0 |
6.6 |
9.0 |
13.0 |
21.0 |
|
Tomato |
1.7 |
2.3 |
3.4 |
5.0 |
8.4 |
|
Trefoil, birdsfoot |
3.3 |
4.0 |
5.0 |
6.7 |
10.0 |
|
Vetch |
2.0 |
2.6 |
3.5 |
5.0 |
8.1 |
|
Wheat*** |
4.0 |
4.9 |
6.4 |
8.7 |
13.0 |
|
Wheatgrass |
2.3 |
4.0 |
6.5 |
11.0 |
19.0 |
*ECw = Electrical conductivity of irrigation water in mmhos/cm at 25°C. A 15 – 25% leaching fraction is assumed.
**Maximum ECw = Electrical conductivity of the irrigation water at which crop growth ceases.
***Barley, wheat, and sugar beets are less tolerant during germination and seeding stage.