Light is essential for plant growth. The rate at which a plant grows depends on the light it receives. This study was carried out to observe the growth of Treculia africana seedlings under different light intensities (100%, 75%, 50%, and 25%) and mycorrhiza inoculation (Ectomycorrhiza, Endomycorrhiza, and topsoil {control}) with five replicates in each treatment. The experiment was laid out in a 3 × 4 factorial in CRD, and data were collected fortnightly for twelve (12) weeks. Data were subjected to analysis of variance in SAS, and the significant mean was separated using Fisher's LSD. The result showed that the seedlings inoculated with ectomycorrhizal had the highest plant height (15.08), leaf area (26.90), number of leaves (5.75), collar diameter (2.61), fresh shoot weight (3.86), root weight (3.86), fresh weight (7.44), dry root weight (1.53), dry weight (2.87), absolute growth rate (0.34) and relative growth rate (0.39) which was significantly different from other treatment. Seedlings exposed to 75% and 25% light intensity had the highest performances compared to seedlings exposed to different light intensities. There was no significant difference (P > 0.05) in the seedlings' physiological variables assessed under the interaction of different light intensities and mycorrhiza inoculation. The seedlings inoculated with ectomycorrhizal and raised in 25% light intensity had the overall highest performance in all the growth variables assessed. Therefore, this study recommends raising Treculia africana seedlings with the inoculation of ectomycorrhizal and under shade to enhance early growth and massive nursery production.
This research was carried out to determine the effect of some pregermination treatments on the seeds of Acacia auriculiformis as it affects growth. The treatments involve the effect of sulphuric acid (concentration and time), mechanical scarification (at different sides), and hot water treatment (volume and time). Split plot design was used for acid treatment and hot water treatment, while Randomized Complete Block Design (RCBD) was used for mechanical scarification. The experiment was carried out at Federal University of Agriculture, Abeokuta, Nigeria. Parameters assessed include; plant height, stem height, leaf number. Acid treatment was carried out using different concentration of sulphuric acid (98%, 50% and 20%) and different treatment time (2 minutes, 5 minutes and 10 minutes). Concentration of acid was significant (p<0.05) on plant height, stem height and leaf number, higher concentration of acid (98%) enhanced morphological parameters of Acacia auriculiformis. Result showed that mechanical scarification significantly affect stem height (p<0.05), however, while mechanical scarification does not significantly affect plant height, the highest mean plant height (8.98 cm) was observed in seeds that were mechanically scarified at the micropyle; early germination of seeds was also noticed. Hot water treatment was carried out using different volume of water (50 cl and 1 litre) and varying treatment time (2 minutes, 4 minutes, 6 minutes and 10 minutes), the treatment showed no significant difference, and this method is not favourable for breaking seed dormancy of Acacia auriculiformis. Result showed that 100% germination could be achieved within seven (7) days when seeds are mechanically scarified at the micropyle, circumference, distal-end and micropyle+distalend, provided the seeds are viable. This research conclude that, acid scarification using H2SO4 at 98% concentration is the best method yielding better morphological parameters in Acacia auriculiformis, followed by mechanical scarification (especially when scarified at the micropyle).
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