Surikova, Valentīna, and Aldis Kārkliņš. 2015. “Phosphorus Removal With Grass In An Apple Orchard Under Influence Of Mulch And Irrigation”.
ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (August): 83-88.
https://doi.org/10.17770/etr2011vol1.923.