FIELD: agriculture.
SUBSTANCE: invention relates to agriculture. Fertiliser-ameliorant includes natural zeolite-containing clay mineral with calcium carbonates CaCO3, silica SiO2, in presence of trace elements, wherein fertiliser-ameliorant used is Khvalynskiy clay of Caspian depression with content of clay minerals, including humus (1.5-2.5 %), organic carbon (0.5-1.0 %), CaCO3 (up to 10 %) SiO2 (up to 60 %), Al2O3 (20-30 %), magnesium elements MgO, exchange cations Na+, Ca2+, Mg2+, potassium isotopes 40K, with average value of relative swelling 0.46.
EFFECT: invention allows to improve water-and-physical properties and soil structure, increases its biological activity and fertility.
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