1. Romanenko, G. A., Ivanov, A.L., Klyukach, V.A., et al., Kontseptsiya razvitiya agrokhimii i agrokhimicheskogo obsluzhivaniya sel’skogo khozyaistva Rossiiskoi Federatsii na period do 2010 g. (Concept of Development of Agrochemistry and Agrochemical Service in Agriculture of Russian Federation until 2010), Moscow: Vseross. Nauchno-Issled. Inst. Avtom., 2005.
2. Frid, A.S., Koroleva, I.E., Bulgakov, D.S., et al., Soil fertility, basic concepts, in Nauchnye osnovy predotvrashcheniya degradatsii pochv (zemel') sel’skokhozyaistvennykh ugodii Rossii i formirovaniya sistem vosproizvodstva ikh plodorodiya v adaptivno-landshaftnom zemledelii (The Scientific Basis for Preventing the Degradation of Soils (Lands) of Agricultural Lands in Russia and the Formation of Systems for the Reproduction of Their Fertility in Adaptive Landscape Agriculture), Moscow: Pochv. Inst. im. V. V. Dokuchaeva, 2013, vol. 2, pp. 5–8.
3. Volynkin, V.I., Volynkina, O.V., and Kopylov, A.N., Changes in soil fertility with long-term use of fertilizers in the Kurgan region, Agrokhimiya, 2019, no. 8, pp. 3‒13.
4. Bortnik, T.Yu., Klekovkin, K.S., Karpova, A.Yu., et al., Aftereffect of long-term use of fertilization systems on fertility indicators of soddy medium podzolic medium loamy soil, Plodorodie, 2022, vol. 3, no. 126, pp. 42–45.
5. Shevtsova, L.K., Chernikov, V.A., Sychev, V.G., et al., Effect of long-term application of fertilizers on the composition, properties and structural characteristics of humic acids in main soil types. Report 1, Agrokhimiya, 2019, no. 10, pp. 3–15.