Integrated approach to estimation of nitrogen use efficiency in intensive dairy husbandry at farm level in the North-West RussiaAleksandr Briukhanov, Eduard Vasilev, Natalia Kozlova and Ekaterina ShalavinaE3S Web Conf., 614 (2025) 03002DOI: https://doi.org/10.1051/e3sconf/202561403002