Vasileva, Viliana, and Ognyan Kostov. “Organic Fertilization of Lucerne and the Following Oat Crop in Non-Irrigated Conditions”. Basrah Journal of Agricultural Sciences 33, no. 2 (October 20, 2020): 106–114. Accessed March 29, 2024. https://bjas.bajas.edu.iq/index.php/bjas/article/view/235.