A. V. Burlay, A. D. Fursov
State Center of Agrochemical Service “Stavropol’skii”, ul. Nikonova, 65, Mikhailovsk, Stavropol’skii krai, 356241, Russian Federation
Abstract. The research was aimed at the comprehensive qualitative assessment of the fertility state of agricultural land in the western part of Stavropol Krai (in the service area of Stavropol State Agrochemical Service Center). In the period between 1964 and 2016, the region experienced permanent reduction of the area of arable land with the optimal content (more than 4%) of organic matter. To date, their share has decreased, compared with the initial one, by two thirds. Until the early 90s, the share of land with the optimal amount of phosphorus (more than 30 mg/kg) increased steadily. In this period, the maximum of appropriate fertilizers was used. Then, a sharp decrease in the volume of their application was followed by a decrease in the soils with optimal phosphorus content. Significant changes in the structure of arable land with the optimal amount of exchange potassium (more than 300 mg/kg) were not detected. In the latter years the problems of the provision of yield with available potassium and increase in the effective soil fertility became one of the most acute. For the period from 1998–2003 until 2011–2016 the weighted average humus content increased by 0.1%; the weighted average mobile phosphorus content decreased by 1.0 mg/kg; the weighted average content of potassium decreased by 12 mg/kg of soil; the acidity index for the same years decreased from 8.15 to 8.12 pH units. In general, the soils in the study area can be considered as not contaminated. We registered some local cases of the excess of maximum admissible concentration of copper and arsenic in light-brown soils of sandy varieties, which appeared on the small area. Of the most important trace elements, only boron was contained in sufficient quantities. All the others were contained in insufficient quantities.
Keywords: soil cover; soil fertility; organic matter; agrochemical examination; mobile phosphorus; exchange potassium.
Author Details: A. V. Burlay, deputy director (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); A. D. Fursov, department manager.
For citation: Burlai A. V., Fursov A. D. Assessment of Agrochemical, Ecological, and Toxicological State of Agricultural Lands in the Western Part of Stavropol Krai . Dostizheniya nauki i tekhniki APK. 2019. Vol. 33. No. 4. Pp. 16–19 (in Russ.). DOI: 10.24411/0235-2451-2019-10404.