Low digestibility and toxicity of hydrocyanic acid (HCN) in sorghum forage are disadvantage for
ruminant. Appropriate fertilizer application and planting strategy can improve sorghum yield and
quality. A field experiment was aimed to investigate the productivity, nutrients content, and HCN
concentration of Super-2 forage sorghum (Sorghum bicolor (L) Moench) at different planting spaces and
levels of NPK fertilizer. The seeds were planted according to 3×3 factorial design in which the first
factor was planting space (J1= 90×20 cm, J2= 75×25 cm, and J3= 60×30 cm) and the second factor was
three levels of NPK fertilizer (P1= 0 kg/ha; P2= 100 kg/ha; and P3= 200 kg/ha, respectively). Crude
protein (CP), crude fiber (CF), and HCN concentration were affected by the interaction of NPK levels
× planting spaces (p