Kotvytskyi, B.B. “Direct Action of Mineral Fertilizers and Optimum Level of Their Application in Crop Rotations Depending on Soddy-Podsolic Soils Fertility in the Western Polissya”. AgroChemistry and Soil Science, vol. 85, Aug. 2016, pp. 61-65, https://doi.org/10.31073/acss85-09.