Bulgarian Journal of Agricultural Science
Array ( [session_started] => 1718747592 [LANGUAGE] => EN [LEPTON_SESSION] => 1 )


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A. Kosolapova, D. Fomin, V. Yamaltdinova, I. Teterlev, E. Mitrofanova
Abstract: Sod-podzolic soils are characterized by low level of natural fertility. The systematic fertilizers application is necessary condition of their fertility improvement and obtaining high yields of crops. Experimental data on influence study of fertilization systems on crop capacity, eight-course rotation productivity (bare fallow, winter rye, wheat with clover undersowing, clover
first year of use, clover second year of use, barley, potatoes, oat) and fertility of sod-podzolic clay loamy soil were presented in the article. Research conducted in 2002–2010 years based on the experimental field of Perm Agricultural Research Institute in the long-term field experiment, established in 1967 year. Studied following fertilization systems in experiment: organic (FYM 10 and 20 t ha–1 average annual rate, actually – 80 and 160 t ha–1); mineral, at rate equivalent to content of nutrients in FYM; organic-mineral with FYM 5, 10, 20 t ha–1 (actually – 40, 80 and 160 t ha–1) and mineral fertilizers at rate equivalent to FYM. Joint application of FYM and mineral fertilizers contributed to accumulation of humus from 2.35% in treatment with low rates of organic and mineral fertilizers to 2.70% with high rates. Application of high doses of organic and mineral fertilizers led to acidification of soil – increase of hydrolytic acidity and decrease of total exchange bases. All fertilization systems led to higher content of mobile phosphorus and exchange potassium in the soil. Comparative evaluation of these fertilization systems revealed significant increase of grain crops and potatoes yield. The largest gains of spring wheat grain (1.55 t ha–1), barley (0.55 t ha–1), oat (1.02 t ha–1) and potatoes (9.95 t ha–1) were obtained by application of organic-mineral fertilization system. The productivity of crop rotation increased when using of mineral fertilizer by 14–20%. The maximum effect was obtained from organic-mineral fertilization system (3859 FU ha–1 per year). Significant heavy metal contamination of soil was not observed in these studies after long-term (about 40 years) use of FYM and mineral fertilizers.
Keywords: fertilization system; heavy metals; sod-podzolic soil; yield
Date published: 2017-09-01
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