“Environmentally Friendly Nitrogen Fertilizers Appplication for Winter Cereals Considering the Mineral Nitrogen Content in Soil”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 26, 2006): 284–287. Accessed March 11, 2026. https://archive-journals.rtu.lv/etr/article/view/3530.