Table
1. Water quality guidelines for irrigation[1]
| . |
Degree of Problem |
||
|
Type of Problem |
None |
Increasing |
Severe |
|
Salinity |
. |
. |
. |
|
EC (dS/m) or |
<0.75 |
0.75-3.0 |
>3.0 |
|
TDS (mg/liter) |
<480 |
480-1920 |
>1920 |
|
Permeability |
. |
. |
. |
|
Low EC (dS/m) or |
>0.5 |
0.5-0.0 |
-- |
|
Low TDS (mg/liter) |
>320 |
320-0 |
-- |
|
SAR |
<6.0 |
6.0-9.0 |
>9.0 |
|
Toxicity of Specific Ions to Sensitive Crops |
. |
. |
. |
|
Root Absorbtion |
. |
. |
. |
|
Sodium (evaluated by SAR) |
<3.0 |
3.0-9.0 |
>9.0 |
|
Chloride |
. | . | . |
|
meq/liter |
<2.0 |
2.0-10.0 |
>10.0 |
|
mg/liter |
<70 |
70-345 |
>345 |
|
Boron (mg/liter) |
1.0 |
1.0-2.0 |
2.0-10.0 [2] |
|
Foliar Absorption (Sprinkler Irrigated) |
. |
. |
. |
|
Sodium |
. |
. |
. |
|
meg/liter |
<3.0 |
>3.0 |
-- |
|
mg/liter |
<70 |
70 |
-- |
|
Chloride |
. |
. |
. |
|
meg/liter |
<3.0 |
>3.0 |
-- |
|
mg/liter |
<100 |
100 |
-- |
|
Miscellaneous |
. |
. |
. |
|
NGF4 and NO3-N (mg/liter) |
<5.0 |
5-30 |
>30 |
|
HCO3 |
. |
. |
. |
|
meq/liter |
<1.5 |
1.5-8.5 |
>8.5 |
|
mg/liter |
<40 |
40-520 |
>520 |
|
pH |
6.5-8.3 |
>8.3 |
-- |
