@article { author = {}, title = {Nitrogen use efficiency and harvest index in black seed (Nigella sativa L.) at different weed competition durations}, journal = {Journal of Plant Production Research}, volume = {20}, number = {1}, pages = {141-156}, year = {2013}, publisher = {Gorgan University Of Agricultural Sciences and Natural Resources}, issn = {2322-2050}, eissn = {2322-2778}, doi = {}, abstract = {}, keywords = {}, title_fa = {کارایی مصرف و شاخص برداشت نیتروژن در سیاهدانهNigella sativa L در دوره های مختلف رقابت علفهای هرز}, abstract_fa = {}, keywords_fa = {}, url = {https://jopp.gau.ac.ir/article_1189.html}, eprint = {https://jopp.gau.ac.ir/article_1189_e630974875dd515df30d76650699e6e2.pdf} }