Substratos orgânicos no crescimento inicial de mudas de Cassia grandis L. f.

Abstract

The use of organic residues in the composition of growing substrates can be a viable alternative in the production of quality seedlings, since it reduces production costs by using agricultural and agroindustrial residues available in the region, reduces the use of chemical inputs, increases the Availability of nutrients to the plant and that are capable of meeting the objectives of the plantations for the implantation of degraded areas. The objective of this study was to evaluate the effect of organic proportions and substrates on the initial growth of Cassia grandis L. f. The experiment was carried out in a greenhouse at the Federal University of Recôncavo da Bahia (UFRB), at the Center for Agricultural, Environmental and Biological Sciences (CCAAB), in the municipality of Cruz das Almas-BA. In a completely randomized experimental design in a 2 x 5 factorial scheme with eight replications, consisting of two types of residues (RES - residue of sisal fiber extraction, COP - organic compost of tree pruning plus cattle manure and goat), combined with (0: 100, 20:80, 40:60, 60:40, 80:20 v / v) for a total of 80 experimental units. After 90 days of sowing, the following evaluations were performed: plant height (H), stem diameter (DC), leaf number (NF), root length (CR), shoot dry mass Dry matter ratio (MSR), total dry mass (MST), relationship between height and stem diameter (H / D), shoot height and dry mass ratio (H / MSPA) (MSPA / MSR) and the Dickson Quality Index (IQD). The use of substrates consisting of Quartzarenic Neosol and residue of sisal fiber extraction and organic pruning compound plus bovine and goat manure do not promote effect on the initial growth of Cassia grandis L. f. The seedlings of Cassia grandis L. f. Cultivated in soil-only substrate present higher Dickson Quality Index.