Abstract
The effects of pre-sowing seed treatments with the bioregulators, Indole - acetic acid (IAA), Indole butyric acid (IBA) and Naphthalene acetic acid (NAA) on seedling emergence of tomato (Lycopersicon esculentum (L.) Mill, genotypes NHLy 11, NHLy 12, NHLy 13, NHLy 15 and NHLy 16 were investigated. The treatments consisted of soaking in 25mg/L, 50mg/L, 75mg/L, 100mg/L, 125mg/L and 150mg/L concentrations of each of the bioregulators and control replicated three times in a completely randomised design. Results showed that seedling emergence was enhanced by all bioregulator treatments at 100mg/L relative to control, the highest values being 92.1, 88.4 and 89.4% for the IAA, IBA and NAA treatments respectively. Marked reduction of seedling emergence was recorded at higher concentrations of 125 and 150mg/L for all test genotypes. This work showed that pre-sowing seed treatments with the bioregulators used in this work are effective in enhancing seedling emergence of tomato, especially at 100mg/L concentration.
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