1. Afanasyev R.A., Belenkov A.I., Diagnostics of nitrogen nutrition of crops using ground and remote photometry, Nivy Rossii 1(167) (2019)
2. Ermokhin Yu.I., Bobrenko I.A., System of soilvegetation operational diagnostics of mineral nutrition of agricultural crops, Electronic scientific and methodological journal of Omsk GAU 4(7) October-December. Retrieved from: http://e-joumal.omgau.rU/index.php/2016-god/7/32-statya-2016-4/500-00245. ISSN 24134066 (2016).
3. Spirina V.Z., Solovyova T.P., Agrochemical methods of research of soils, plants and fertilisers (Publishing House of Tomsk State University, Tomsk, 2014).
4. Belyuchenko I.S., Ecology of Krasnodar Krai (Regional Ecology) (FGOU VPO “Kuban GAU”, Krasnodar, 2010) 356 p.