Germinação da semente e crescimento de mudas de diferentes proveniencias da acacia nilotica wild ex delile no viveiro

Abstract

The present work presents the results of the evaluation of the influence of the seed origin on the germination and growth of acacia nilotica seedlings in the laboratory and in the nursery, respectively. The germination test was established in the S.N.S. for Boane, Matutuine and Maniquinique seed using the completely randomized design. the seed was subjected to the following treatments: 24 hours in water at room temperature; 3, 5, 7, 9, 15 minutes in boiling water; and 3, 5, 7, 9, 15 minutes in 98% M2SO4. As a witness, untreated seed was used. The analysis of variance revealed the existence of interpretation between origin and treatment. The best treatment for Maniquinique was 24 hours with 42.50% and for Boane and Matutuine the best treatment was immersion in boiling water for 5 minutes with 26.25% and 32.75% respectively. Soaking the seed in boiling water for 15 minutes caused seed mortality. The best seed treated in H2SO4 was 15 minutes for the three sources with 49.25%, 68.75% and 75.50% for Boane, Maniquinique and Matutuine respectively. However, it is recommended to increase the number of treatments with sulfuric acid until the seed loses viability. The growth assay was established in the C.E.C.M. nursery using the BCC design. The seed was subjected to treatment with 98% H2SO4 for 15 minutes. Plant survival, total dry biomass, stem, leaves and roots were evaluated for the origins of Boane, Matutuíne, Maniquinique, Tete and Mieze. At 90 days, the correlation of the measured variables was evaluated. The analysis of variance revealed significant differences between the origins, showing the superiority of the Mieze origin with 35.02 cm in height, 32 leaves, total biomass of 3.55 g, with 1.59 g for leaves, 1.16 gr for stem and 0.81 gr for root and 99% survival. For the collar diameter, Tete had a larger diameter with 1.63 mm as well as the root system biomass with 1.07 gr.