Abstract
Pre-sowing seed treatments of four exotic Acacia species, Acacia albida syn. Faidherbia albida, A. holosericea, A. auriculiformis and A. amplices were investigated. Seeds were subjected to hot water and acid scarification treatments. Germination percentage, germination value and vigor index achieved in different pretreatments were recorded. In A. albida, significantly higher values for all the germination parameters with per cent germination (68.66 %), germination value (5.95) and vigor index (9548.33) were recorded in treatment with conc. sulphuric acid for 5 minutes. In A. holosericea, hot water treatments promoted germination significantly (69.33 %) and vigorous seedlings (VI= 5262.66) were produced. However, highest germination value (3.81) was recorded in treatment receiving alternative dip in hot and cold water thrice. Similar trend was noticed in the A. amplices, where significantly superior values for germination percentage, germination value and vigor index were obtained in treatments receiving variations in hot water and soaking. Seeds dipped in boiling water for 10 min followed by soaking for 12 hrs was found effective in breaking dormancy in A. auriculiformis, where 77 % germination, 10.2 average germination value and 4573.33 value of vigor index was observed.
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