@article{paperid:1058854, author = {Seyyedi, Seyyed Mohammad and Rezvani Moghaddam, Parviz and Nassiri Mahallati, Mehdi}, title = {Weed Competition Periods Affect GrainYield and Nutrient Uptake of Black Seed (Nigella Sativa L.)}, journal = {Horticultural Plant Journal}, year = {2016}, volume = {2}, number = {3}, month = {May}, issn = {2468-0141}, pages = {172--180}, numpages = {8}, keywords = {Nigella sativa; nitrogen; nutrient competition; oil yield; phosphorus; weed-free period; weed-infested period}, }