Seyyedi,S M , , Khajeh-Hosseini,M , , Rezvani Moghaddam,P , and Shahandeh,H . "Relation between the increasing soluble phosphorus and nitrogen uptake and its effects on phosphorus harvest index of black seed", Iranian Journal of Field Crop Science, 46, 1, 2015, 25-36. doi: 10.22059/ijfcs.2015.54043