Abstract
Sorghum is a vital crop for human, animal and industrial use in most part of the world. However, weeds constitute
a constraint to sorghum production, thus effective chemical control of weed is widely used for large scale sorghum
production. The aim of this study was to investigate the effect of Prim-extra gold herbicide applications on
germination, weed fresh weight and yield of SAMSORG 42, 44 and CSR–02 high yield Sorghum bicolor (L)
Moesch varieties. The field experiment was conducted at the Botanical Garden, Department of Botany, Ahmadu
Bello University, Zaria and consisted of four rates of the herbicide (0.0, 1.5, 3.0 and 4.5L /ha) and hoe weeding
control on the Sorghum varieties. The treatments were laid out in a complete randomized design and replicated
three times. Assessment of the Sorghum varieties was done at 4, 6 and 8 weeks after planting and yield parameters
at harvest. Result showed that, all the herbicide rates and the hoe weeded treatments significantly (P ≤ 0.05)
increased the yield above the control in all the Sorghum varieties. Combined data across varieties showed that, CSR
– 02 showed higher germination and yield than the other varieties. In conclusion, the study showed that, herbicide
application at 1.5 L/ha and the hoe weeding treatment significantly increased germination and yield components of
the three Sorghum varieties.

Key words: Application, Germination, Herbicide, Pre-emergence, Treatments, Varieties