G.A. Katrichko, T.S. Ivanova
Station of Agrochemical Service “Karel’skaya”, ul. L. Tolstogo, 5, Petrozavodsk, 185003, Russian Federation
Abstract. The analysis of the agrochemical survey results of soils of agricultural lands of the Republic of Karelia was carried out for the period of 1965–2015. The dynamics of changes in such parameters of soil fertility as acidity, the content of organic matter, mobile forms of phosphorus and potassium, depending on the volume of application of chemicalization means, is determined. The greatest use was noted in 1981–1990. A sharp decline in agrochemical work has led to a deterioration in the fertility of agricultural soils. The average weighted index of soil acidity (pH) increased by 0.45 units (from 5.03 to 5.5 pH units) over 1965–1993, and then it decreased to 5.2 pH units to 2015. Due to the application of ground phosphate rock as “a reserve” during the years of an intensive chemicalization of agriculture (1970–1990) the content of mobile phosphorus increased by 90 mg/kg of soil from 1965 to 2015. The soils of all agricultural lands are poor in available potassium. In 1965–1970 it weighted average content was 137.0 mg/kg of soil, over 1970–1975 it increased up to 188.0mg/kg of soil, but to 2010–2015 it returned to the initial level (137 mg/kg of soil). An unambiguous regularity between the application of organic fertilizers and the content of organic matter in the soil was not revealed. Since 1996 it is a negative balance of nutrition elements in the agriculture of the Republic of Karelia; in 2011–2015 its deficit was 13,500 tons of active substance.
Keywords: agrochemical survey, soil acidity, mobile forms of phosphorus and potassium, organic matter.
Author Details: G.A. Katrichko, director (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); T.S. Ivanova, head of division.
For citation: Katrichko G.A., Ivanova T.S. State of Soil Fertility, Dynamics of Application of Mineral and Organic Fertilizers, Balance of Nutrition Elements in the Republic of Karelia. Dostizheniya nauki i tekhniki APK. 2017. Vol. 31. No. 9. Pp. 7-11 (in Russ.).