The effect of natural salt of various concentrations on agrophysical state of the soil in model experiment

In laboratory experiment the effect of natural salt with herbicidal activity on agrophysical state of the soil was evaluated. For studying the mechanism of the influence of natural salt with the concentration of 1, 5, 10, 15, and 20 % on the plant-soil system and the change in agrophysical state, untreated natural brines of the Troitsk deposit in Krasnoyarsk Region were used. Crude natural brines in their composition contained in g/l: sodium - 77.07; magnesium - 0.49; iron - 36.79; calcium - 2.56; potassium - 2.36; chlorides - 131.00; sulfates - 1.51. It has been established by the studies that sodium chloride, being the main component of brines of the Troitsk field, has herbicidal activity and migration ability at a solution concentration of more than 5. Using natural salt as a herbicide determined the tendency for the decrease in soil moisture by 5-7 % (p = 0,003) and an agronomically valuable fraction of aggregates by 5-8 % (p = 0.05) compared with the control. It was shown that the concentration of the solution influenced free moisture content in the soil (r = -0.50) and had strong inverse relationship with the content of valuable aggregates (r = -0.73). Moreover, the multiple coefficient of determination (R2 = 0.96) confirms that the concentration of the salt used as a herbicide determined total agrophysical state of the soil by 92 %. The concentration of the solution of 5-10 % had the greatest effect on the properties of the soil, determining the decrease in moisture content of 6-7 %, the increase in the proportion of dusty aggregates to 4-6 % and the decrease in the density of addition to 0.82-0.84 g/cm3.