SH. S. AL-SAADON, A.; M. MUHAWISH, N. Effect of Plant Spacings and Level of Boron and Nitrogen on Concentration of some Nutrients in Leaves and Floral Heads of Broccoli (Brassica oleracea var. italica Plenck) in a gypsiferous soil. College of Basic Education Research Journal, [S. l.], v. 17, n. 1, p. 955–980, 2021. DOI: 10.33899/berj.2021.167751. Disponível em: https://moss.uomosul.edu.iq/index.php/berj/article/view/39054. Acesso em: 26 oct. 2025.