EFFECT OF PRE-TREATMENTS ON THE GERMINATION AND EARLY SEEDLINGS GROWTH OF ACACIA AURICULIFORMIS CUNN. EX. BENTH

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EFFECT OF PRE-TREATMENTS ON THE GERMINATION AND EARLY SEEDLINGS GROWTH OF ACACIA AURICULIFORMIS CUNN. EX. BENTH

ABSTRACT

Acacia auriculiformis Cunn. Ex. Benth is a multipurpose wattle tree with diverse environmental and ecological significance. However, seeds dormancy and low germination percentage are problems for its use in agro-forestry practices. Investigations were carried out on the effect of pre – treatment on the germination and early seedlings growth of A. auriculiformis. Germination were observed in seeds pretreated with sulphuric acid at 7days after sowing (DAS) while seeds under the nitric acid and control treatment germinated at 8 and 9 DAS respectively. Results, shown that pre – sowing treatments have positive influence on seed germination; seeds treated with Conc. H2SO4 for 5 to 10 min had the highest percentage germination of 92 – 96% compared with 42% for the control treatment. The effect of different pre-treatment test, their interaction and time of exposure significantly (P < 0.05) influenced seedlings growth parameters. The highest mean shoot length and stem diameter values of 5.92 cm and 0.29 mm respectively were recorded among seedlings that originated from seeds pre – treated with sulphuric acid for 5 and 10 min. Hence, dormancy in A. auriculiformis seeds can be removed by pre – treatment with sulphuric acid (5 and10 min) with enhanced percentage germination and growth performances.

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