Effect of scarification treatments on the germination of Leucaena leucocephala, Albizia lebbeck and Samanea saman [Albizia saman].
Seeds collected in Andhra Pradesh were treated by 3 methods: mechanical scarification (using sand paper or a grind stone, or by nicking with a needle at the abaxial end); soaking in hot water for 5-20 min; and soaking in concentrated sulfuric acid for 3-90 min. The seeds were then germinated on crepe craft paper at 30/20°C. All the scarification treatments increased germination over that of untreated control values, with L. leucocephala responding best (99-100% germination, compared with 30% for the control). L. leucocephala also responded best to the hot water treatment, with the other 2 species responding poorly. However, maximum germination (reaching 100% for all species) was recorded after sulfuric acid treatment (30-60 min for A. lebbeck, 10-30 min for L. leucocephala, 345 min for A. saman). Germination tended to fall off with the longer treatments. Seedling growth was also best after the sulfuric acid treatment.