Vigovskis, Janis, Aivars Jermuss, Daina Sarkanbarde, and Agrita Svarta. 2015. “The Nutrient Concentration in Drainage Water in Fertilizer Experiments in Skriveri”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (June): 323-28. https://doi.org/10.17770/etr2015vol2.277.