In my experiment soil filled with pot having 6.72 kg air dried sandy loam. I would like to soil salinity by adding salt artificially which maintain EC = 10 ds/m. So how many gm (Nacl) add soil to make soil salinity? Please guide me. Any suggestion or comments will be ok.
Dear Signha
You can determine it experimentally as follow:
take a 100 g of dry soil then prepare a saturation paste by adding different amounts of NaCl (0.05, 0.1, 0.2, 0.3, 0.4..g/100 soil). measure the EC of the saturation paste. Then make a graph salt added vs EC. you will get a linear equation. you can calculate the required NaCl for a specific EC of your soil. This is probably the best way of maintaining a specific EC for any specific soil. Because each soil has different degrees of buffer capacity to the added salts. This my own method you cannot find it in the literature.
PPM =mg per Liter D.W. PPM/640 = EC dS m-1.
For EC =10 dS m-1 you must prepar a solution has concentration of 6400 ppm.
it means dissolving 6.4 gram of NaCl IN one liter D. water =10 dS /m .
Then you must determine the soil water holding capacity of the applied soilfor example Saturation point ,field capacity then determining the amount of required saline solution for the mentioned purpose ,or for yoyr pot experiment. For example the moisture content at field capacity =25% it means foe each 100g oven dry soil the mount of required solution =25ml and for 1kg soil =250 ml for 6kg soil = 6*250 =1500ml and so on .
Dear Ashutus Singha
First, What is the EC of your soil??
You can prepare a solution with an EC=10 dS/m
but to increase a soil EC to 10 dS/m is much harder
In fact use saline soil and unsaline soil (same type) to finde actully results
Dear Signha
You can determine it experimentally as follow:
take a 100 g of dry soil then prepare a saturation paste by adding different amounts of NaCl (0.05, 0.1, 0.2, 0.3, 0.4..g/100 soil). measure the EC of the saturation paste. Then make a graph salt added vs EC. you will get a linear equation. you can calculate the required NaCl for a specific EC of your soil. This is probably the best way of maintaining a specific EC for any specific soil. Because each soil has different degrees of buffer capacity to the added salts. This my own method you cannot find it in the literature.
This question is hard to answer. Salinity is dependent of both soil and crop.
Would it be 4 dS/m, 8 dS/m or 16 dS/m of electrical conductivity of the saturated paste extract at which crop yield is reduced by 50%? Since soil adsorption capacity also varies, sodium adsorption ratio (SAR) should be considered. Normally, if SAR is greater than 15, salinity is a concern.
Veli Uygur, I totally agree with your opinion. The addition of increasing amounts of NaCl and subsequent incubation for some days for stabilization is a nice idea. In the process, soil EC is checked from the suspension and plotted on a straight line graph from where the desired level of salinity can easily be determined
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