HILAL, Nashmi Ahmed; KHALAF, Ahmed Ibrahim; ALWAN, Afrah Abdul Kareem Hussein. Role of Phosphorus Source and Biochar Levels on Some Fertility and Productivity Characteristics of Barley Crop Grow in Gypsiferous Soils. American Journal of Botany and Bioengineering, [S. l.], v. 3, n. 2, p. 34–44, 2026. DOI: 10.51699/ajbb.v3i2.2028. Disponível em: https://www.biojournals.us/index.php/AJBB/article/view/2028. Acesso em: 6 jun. 2026.