Electrical Conductivity Of Water For Irrigation

The primary effect of high ec w water on crop productivity is the inability of the plant to compete with ions in the soil solution for water physiological drought.

Electrical conductivity of water for irrigation. Ec of irrigation water is expressed in deci siemens per metre at 25 c ds m superseding the old millimhos per centimetre mmho cm. Estimated from the electrical conductivity by using the relationship given on page 17. The electrical conductivity of water increases by 2 3 for an increase of 1 degree celsius of water temperature. For other water bodies there are objectives for conductivity or tds.

Combined effect of electrical conductivity ecw of irrigation water and sodium adsorption ratio sar on the likelihood of water infiltration permeability problems sodium adsorbtion ration water infiltration problem sar of irrigation or soil unlikely when ecw ds m is more than likely when ecw ds m is less than 0 3 0 6 0 3 3 6 1 0 0 4 6 12 2 0 0 5 12 20 3 0 1 0 20 40 5 0 2 0 source ayers and westcot 1985. I and soil salinity is ec. Electric current and is reported in one of three possible units as given in table 2. Conductivity objectives are also established to protect the quality of water used for irrigation.

First of all in the field the water content of the soil fluctuates from extremely dry to saturated. E 1 5 ec. The electrical conductivity of irrigation water ec. The greater the conductivity the greater is its salt content.

Ec iw is the electric conductivity of the irrigation water. Irrigation water with a high electrical conductivity will tend to have fewer problems with infiltration than a low ec water table 6. Ocean waters have water electrical conductivity of about 5 ms tap water has ec in the range of 50 to 800 us depending on the source freshwater streams may fall in the range of 100 to 2000 us and distilled water has ec of between 0 5 and 3 us. An indirect and a more common method of determining the salt content of an irrigation water is to measure its electrical conductivity ec.

Subscripts are used with the symbol ec to iden tify the source of the sample. Ec e is the electric conductivity of the soil as measured in a soil sample satu rated extract taken from the root zone. The mean annual electrical conductivity of lake tahoe shall not exceed 95 umhos cm at 50 degrees f at any location in the lake. The most influential water quality guideline on crop productivity is the water salinity hazard as measured by electrical conductivity ec w.

Measuring the salinity level of water in soil is rather. Ph rrading this is an expression of the intensity of the acid or. 1 classification of irrigation water analysis of irrigation waters 3 continlled methods of analysis 3 diagram for classifying irriga. Many ec meters nowadays automatically standardize the readings to 25 o c.

I if about 15 percent of the ap plied water is draining from the crop root zone. Ec is relative to temperature.