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The objective of this study was to determine the agronomic characteristics, chemical composition and in situ degradability of different sorghum genotypes. The experiment was conducted at the National Maize and Sorghum Research Center - Sete Lagoas, MG. For agronomic and nutritional characteristics, a randomized block design was used, and for in situ degradability, a split-plot design was applied. Genotypes 13F2006, BRS655 and Volumax showed lower dry matter productivity compared to 12F02006 and 12F03033. Genotype BRS655 had the lowest levels of neutral detergent-insoluble fiber (NDF), acid detergent-insoluble fiber (ADF) and lignin. Furthermore, no difference was found for potential degradability (PD), indigestible fraction (IF), and effective degradability (ED) at 2; 5 and 8% hour-1 DM among the studied materials. Genotypes 12F03033 and 12F02006 combine higher productivity and nutritional quality. [ABSTRACT FROM AUTHOR]

The objective of this study was to characterize the phytosociology of weeds in irrigated cultivation of black beans, under different sowing densities in semi-arid region of Minas Gerais, Brazil. The experiments were conducted in the autumn-winter harvest. The treatments consisted of four bean sowing densities (50, 100, 200, and 500 thousand seeds ha-1), in a randomized block design, with four repetitions. Weed plants with complete structure were collected using the standard method of the square inventory and phytosociological parameters were estimated, studied using descriptive analysis. Lower sowing densities favored the development of species with C4 metabolism, while higher density suppressed their diversity, especially promoting Sena obtusifolia. The sowing density of black beans alters the dynamics of weeds in semi-arid conditions in Minas Gerais, Brazil. The density of black beans at 500 thousand seeds ha-1 suppresses the diversity of weed species, especially those with C4 metabolism. The species S. obtusifolia, Eleusine indica, Amaranthus spp., and Brachiaria plantaginea have higher importance value indices (IVI) and coverage value indices (IVC) in different densities of black beans in the semi-arid region of Minas Gerais, Brazil. [ABSTRACT FROM AUTHOR]

The objective of this work was to carry out the morphobiometric characterization of fruits, seeds and seedlings of Khaya grandifoliola. The fruits were characterized by evaluating length, diameter and thickness of the pericarp, and the seeds by length, width, thickness, weight of 1,000 seeds and moisture content. Germination and seedling morphology were also analyzed. The data were submitted to descriptive statistical analysis and the seeds grouped into classes, through a frequency distribution, according to their length. The fruits of K. grandifoliola are capsule-type with longitudinal dehiscence, polyspermic, with approximately 48 seeds of intermediate predominance and flattened shape, with a slight extension in the tegument and slightly winged. The seeds vary in length from 19.84 to 38.31 mm, width from 18.10 to 20.77 mm and thickness from 2.25 to 2.82 mm, weight of 1,000 seeds was 274.12 g and moisture content was 6.8%. Primary root protrusion is visible from the fifth day after sowing, and germination is of the cryptocotyledon hypogeal type, with seedling formation at 14 days, with reddish-green primary leaves. The results obtained are important to support methodologies definition and future additions to the RAS on the K. grandifoliola species. [ABSTRACT FROM AUTHOR]

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