Questions about the relationship between EC graphs and salinity readings, and how factors like acids, fertilizers, drip line cleaners, etc., influence these readings, are common. Here, we'll delve deeper into these explanations.
Common questions about salinity and EC (Electrical Conductivity) measurements include distinguishing between soil-related and soil-water-related factors, as well as understanding what substances or salts are considered in the calculation.
EC and Salinity graphs represent EC measurements influenced by soil and water salinity, as well as water content. Water salinity can originate from salts in the water source, setting a baseline EC level, or from added salts and fertilizers, increasing EC intermittently.
The EC graph represents the electrical conductivity (EC) of soil pore water, ideally aligning with the average conductivity of irrigation water. It tracks changes over time in soil EC and salinity due to fertilization, irrigation, and salt application.
The Salinity graph depicts the EC of saturated paste (or extract) of EC measurements typically conducted on saturated soil paste samples in soil laboratories.
The standard thresholds for yield reduction due to salinity are derived from the Saturated Paste EC. Therefore, this graph is best suited for assessing the average soil salinity and determining whether plants are at risk.