Avaliação de diferentes substratos no crescimento da Millettia stuhlmannii Taub

Abstract

Studies on native forest species, in general, are incipient and the existing ones are mainly related to botanical and dendrological characteristics and little is known about silvicultural characteristics, growth pattern and nutritional requirements. With this observation, the objective of this study was to evaluate the growth of Millettia stuhlmannii in different organic substrates. The experiment was carried out in the forest nursery of the Forest Research Center (CIF), located in the Marracuene district, Maputo province. The experimental design was completely randomized blocks with 6 treatments (substrates) and 5 repetitions (blocks) with 20 seedlings per treatment within each block, so that each block had 120 seeds launched, with a total of 100 seeds for each treatment and the experiment. total of 600 seeds willing to germinate. Measurements were made fortnightly from 30 days after sowing of height and diameter of the neck and at the end of the test (at 105 days) the root and aerial dry biomass was quantified. The collected data were submitted to the Bartlett and Shapiro-Wilk test to determine the homogeneity of the variance and normality of the residues, respectively, and then the analysis of variance and the Scott-Knott test were performed to observe the difference between the means. From this statistical analysis, it was observed that there were significant differences between the variables analyzed in all the evaluation periods (30, 45, 60, 75, 90, 105 days). From the correlation analysis between the variables evaluated, the correlation coefficients obtained show the existence of positive correlations for all measured variables except the aerial dry biomass (BsPA), which showed negative correlations with the other parameters, excluding the total dry biomass ( Bstotal). This negative correlation found between BsPA and the remaining parameters may be due to the attack of a pest that gnawed at the leaves, reducing their contribution to BsPA. Among the tested substrates, the best results for the production of Millettia stuhlmannii were the substrate based on Pinus spp bark, the control T1 (mixture of 40% coarse sand, 20% clay and 40% bovine manure) and T5 ( mixture of 25% coarse sand, 25% bovine manure and 50% coarse Pinus spp) were not favorable. (TRADUÇÃO NOSSA)