TY JOUR TI PATTERNS OF CHANGES IN THE SPATIAL STRUCTURE OF AGROCHEMICAL PROPERTIES OF ARABLE LIGHT GRAY FOREST SOIL DURING LONG-TERM OBSERVATIONS KW agrochemical properties of soils KW spatiotemporal heterogeneity KW variogram analysis KW geostatistical analysis KW long-term data KW soil fertility JO Vestnik of Kazan State Agrarian University AU Sakhabiev, I.A. AU Gaffarova, L.G. AU Giniyatullin, K.G. AU Smirnova, E.V. PY 2025 IS 20 PB Kazan state agrarian University