METHOD FOR DETERMINATION OF AGRORESOURCE STATE OF SOILS ACCORDING TO AMELIORATIVE SCALE OF RICE IRRIGATION SYSTEM Russian patent published in 2020 - IPC G01N33/24 

FIELD: investigation of earth surface.

SUBSTANCE: invention relates to investigation of earth surface and can be used in agriculture, in particular for rice growing. Method includes conversion of obtained image, calculation of areas of selected outlines. During the non-vegetation period using the navigation system on the map of the rice field, coordinates and numbers of sampling points of soil samples and measurements of groundwater level and mineralization are plotted. Then, soil reclamation state is quantitatively estimated by ground water level and mineralization, humus content and acid-alkaline soil properties; provision of hydrolyzable nitrogen, mobile potassium and mobile phosphorus; percentage content of soil aggregates in arable horizon; degree and type of soil salinity by assigning to each meliorative criterion from 1 to 5 points depending on degree of its influence on meliorative state of soil. Thereafter, meliorative condition of soil is estimated by total score of melioration criteria. Then, for each meliorative state of soil, a process map is developed with an optimum adaptive complex of technological operations. At the same time, meliorative criteria are additionally taken into account: humus resources in 0–100 cm layer; nitrogen enrichment with C:N; content of exchangeable magnesium in soil (MgO); content of sulphate (mobile) sulfur; degree of saturation with bases; total porosity; soil density; nitrification ability of soil at the beginning of sowing of winter and wintering crops; content of water-resistant aggregates > 0.25 mm in 0–30 cm layer at the beginning of the winter and wintering crops sowing; "Total effect" of toxic ions CO₃^2-, HCO₃^-, Cl^-, SO₄^2-; CO₂ emission rate in soil; content of microelements (Manganese (Mn), Copper (Cu), Zinc (Zn), Cobalt (Co), Molybdenum (Mo)). Then, ameliorative condition of soil is evaluated by total score of reclamation criteria, and with total score of 20–50, meliorative state of soil is considered to be good; 50–80 – satisfactory, 80–100 – unsatisfactory.

EFFECT: higher efficiency and quality of assessing agroresource state of soils.

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