Hydraulic conductivity and hydrodynamic dispersion of hydrogel compositions for rhizosphereстатья

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[1] Hydraulic conductivity and hydrodynamic dispersion of hydrogel compositions for rhizosphere / A. V. Smagin, N. B. Sadovnikova, M. V. Smagina et al. // Экологический вестник Северного Кавказа. — 2017. — Vol. 13, no. 2. — P. 4–12. Hydraulic conductivity as a function of thermodynamic potential (pressure) of soil moisture K(P) as well as hydrodynamic dispersion of silver ions are investigated over the samples of sandy soils with admixtures of strongly swelling polymer hydrogel (SSPH) within the wide concentration range of 0.01 to 0.2%. It is assumed the integrated use of the gel for the purposes of improving the water-holding capacity of soils and their structural status, as well as to place in the rhizosphere of modern crop protection products in the swollen gel compositions. The author’s original centrifugation method was used along with a kinetic model of the moisture removal process, which enables to determine the function of moisture conductivity of gel compositions applied in unsteady behavior. The function being studied undergoes substantial variation when affected by SSPH in proportion to the dose of superabsorbent lowering by 2-10 (down to 50) times within the range of low absolute values of moisture pressure | P | = 0.3-20 kPa, and increasing by up to 2-8 times at siccation of gel compositions to the range of | P | = 20-700 kPa. Hydrodynamic dispersion in the gel compositions in comparison with soil substrates is reduced by 2-3 orders, that demonstrate the robust holding of ions in the gel structures designed to protect the rhizosphere from pathogenic organisms.

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