Importance of the diffusion in the migration of the salts

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Summary
It is very important from theoretical and practical sides to determine diffusion of salts in regularity of changes. But despite of it, study of diffusion process of the salts in land was investigated weakly. Some works in this field is dedicated to study of fertilizing salts. A.F.Lebedev and B.A.Chernov have been engaged for the first time in study of motion of salts in soils and application of hydro diffusion law.
We had determined in the result of field experiment works that a role of diffusion of salts in repeated salinization of salts in natural and irrigation conditions of dealluvial form of saline soils. We carried out experiment to define how this process influences.
The experiment has been carried out with NaC1 salt in grey-brown soils taken from tract of Gurovdag on general adopted methodic.
Despite in all options of experiment diffusion of salts during 15 days have covered all layers of soil in experiment cylinder but the amount of diffused salt was low in upper layer of weakly damped soil and in high damped soils it was more. But such proportion was defined by 30 and 60 days experiments. Increase of dampness in soil was influenced on increase of diffusion ratio as well. Thus in low damped soil (16.5%) depending on time coefficient of salts changed around 0.133 -0.201 and in soils with 21% of dampness this indicator was 0,179-0,343 sm2/day. Such increase was defined in other options of experiment. We determined in the experiment of diffusion of the salts that dampness in the cylinder, as usual, moves towards soil layer with salt.
It became clear in the result of experiments that diffusion coefficient in saline soils of dealluvial from is bigger and it changes depending on dampness degree and physical properties of soil.
One can come to such conclusion from abovementioned that role of diffusion of salts in formation of salt profiles of saline soil in dealluvial from is great. Result of the perennial investigations that we carried out in these lands showed that lands have suitable water-salt regime for right passing of diffusion process here.



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