Effect of Boron and Nitrogen Level under Different Plant Spacings on some Growth and Yield Parameters of Broccoli (Brassica oleracea var. italica Plenck) in a gypsiferous soil. College of Basic Education Research Journal, [S. l.], v. 17, n. 2, p. 1387–1418, 2021. DOI: 10.33899/berj.2021.168549. Disponível em: https://berj.uomosul.edu.iq/index.php/berj/article/view/38877. Acesso em: 11 jul. 2026.