Crop monitoring for nitrogen nutrition level by digital camera, Automation 2018 Publication Type: Journal Article Authors: Igor Korobiichuk; Vitaliy Lysenko; Olexey Opryshko; Dmitruy Komarchuk; Natalia Pasichnyk; Andrzej Juś Source: Advances in Intelligent Systems and Computing, Volume 743, p.595–603 (2018)