My question is if I had a 10 kg soil in a pot. How much NaCl is to be added in the soil to maintain an EC of 5 dSm-1?
How many times we need to add the salt? to maintain the stress level?
I suspect it's dependent on the type of the soils because they are complicated and various substances. Some ions would be adsorbed to be insolubilised upon specific soils. The general answer for this question would be DO experiments: adding several conditions of amount of NaCl to the subjective soil and measure the EC and decide the suitable NaCl amount.
If I dare to say, Na is less likely to be adsorbed. Thus, when you prepare the soil at 5 dSm-1 of EC NaCl, first dehydrate and totally dry out the soil (maybe using an oven), and then add the liquid media or water containing NaCl at 5 dSm-1 of EC to the dessicated soil. The required amount of media is dependent on your purpose. Evaporation of water will increase the NaCl concentration so you have to water with DW and maintain the total weight unchanged, or drain well and flow through the pot with the media of the exact EC level.
If the EC level has to be accurately controlled, the usage of sand as soil would be recommended, or water culture would be more suitable.
I'm sorry my answer is no so much simple but it would help your project.
Our study is about irrigation water salinity. NaCl, CaCl2, and MgSO4 salts were used in the experimental subjects. The SAR value is kept around 5. Thanks.
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