Abstract
The effect of different fertilizing systems on the content of humus in gray forest soils of the Opolie region has been studied during three cycles of eightand seven-course crop rotations. At the application of phosphorus–potassium fertilizers and without fertilization, the content of humus in the plow layer has decreased by 0.02% annually in the first rotation cycle and by 0.011% in the second and third cycles. In the first cycle, the addition of 1 t of litter manure and 1 kg of nitrogen increased the humus content by 55 and 9.8 kg, respectively; in the second and third cycles, the humus increment due to the organic and mineral fertilizers decreased by 2–3 times.
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Original Russian Text © V.V. Okorkov, L.A. Okorkova, O.A. Fenova, 2016, published in Rossiiskaya Sel’skokhozyaistvennaya Nauka, 2016, No. 1, pp. 21–26.
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Okorkov, V.V., Okorkova, L.A. & Fenova, O.A. Changes in the content of humus in gray forest soils under long-term fertilization. Russ. Agricult. Sci. 42, 149–154 (2016). https://doi.org/10.3103/S1068367416020105
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DOI: https://doi.org/10.3103/S1068367416020105