The confinement of pigs stands out as a great generator of swine wastewater (SW). The final destination of waste generated is currently a concern of society, since if handled improperly, it can cause serious impacts to the environment. One of the alternatives is the use of SW as a source of nutrients, which are made available to the plants, after the mineralization of organic matter. The objective of this work was to compare soil chemical attributes under two planting arrangements, in single and double lines of Corymbia citriodora. Two experiments were carried out at the Bonsucesso farm, in Uberlândia-MG, the first with C. citriodora in simple lines, with five plants per plot, spacing two meters between plants and 15 meters between rows. The second experiment was with C. citriodora in double lines, with two meters between plants in the line, three meters between lines in the plot and 15 meters between the double lines of C. citriodora. The statistical design was in randomized blocks. The treatments used were five doses of SW (0; 200; 400; 600 and 800 m³ ha-1) with five replicates. The application of SW rates was divided in the dry season, in the months of June, July and August. The chemical characteristics of the soil were evaluated in the 0-20 cm depth layer. Planting on double lines of C. citriodora provided higher soil nutrient contents. The application of swine wastewater raised the levels of potassium and heavy metals such as copper and zinc. The dose of 200 m3 ha-1 provided adequate levels for most nutrients present in the soil.

The objective of this study was to evaluate the effect of different sources and doses of N combined with marine algae on the development of corn plants. Field experiments were conducted from December 2010 to February 2012 in Uberlândia, Minas Gerais. The experimental plots were laid out in a randomized block design with sub-subdivided plots. Different nitrogen sources in the form of immediate-release and controlled-release urea were evaluated on plots; rates of 0 (control), 60, 100 and 120 kg of N ha-1 were evaluated on subplots; and applications with or without marine algae were evaluated on sub-subplots. The dose of marine algae corresponded to 20% of the dose of urea. The study concluded that the application of marine algae in corn did not influence the efficiency of the different nitrogen sources. However, increasing nitrogen doses resulted in higher content of foliar N, thousand-grain weight and crop yield.

BERNARDES, MURILO HENRIQUE DE DEUS. Estimation of genetic parameters for agronomic traits and evaluation of the physiological quality of seeds in two soybean populations. 2019. 43f. Dissertation (Masters in Agronomy-area of concentration in Phytotechnology)-Federal University of Uberlândia, Uberlândia 1. Obtaining more productive genotypes of soybean cultivation is one of the main objectives of breeding programs. There are few studies on the selection of agronomic traits associated with the quality and performance of soybean seeds. The objective of this work was to estimate genetic parameters of agronomic traits, seed quality and grain yield in soybean segregating populations, from parents with different seed quality history. The following cultivars were used to obtain segregant populations: NS 7200 RR, NS 7670 RR and UFUS 6901. The crossing block was installed in a greenhouse, with the following combinations: (1) UFUS 6901 x NS 7200 RR and (2) UFUS 6901 x NS 7670 RR. From the artificial hybridizations the F1 seeds were generated, which were harvested and seeded again to obtain the F2 seeds by means of their selffertilization. F2 seeds were sown in the field, by sowing in pits. For the combination 1, 66 seeds of cultivar UFUS 6901, 62 seeds of cultivar NS 7200 RR and 203 seeds of generation F2 were seeded. For the combination 2, were seeded 64 seeds of cultivar UFUS 6901, 64 seeds of cultivar NS 7670 RR and 230 seeds of generation F2. Agronomic traits were evaluated in all individuals: number of days for flowering (NDF) and maturity (NDM), plant height at flowering (PHF) and maturity (PHM), number of nodes at flowering (NNF) and maturity (NNM), height of first pod insertion (HPI), number of grains per pod (NGP), production of grains (PG) and weight of a thousand grains (WTG). Data were analyzed by means of analysis of generations and estimated the genetic parameters. For the three parental and both segregant populations, the physiological quality of the seed was evaluated by germination, germination and primary root length and fresh and dry matter of seedlings. The emergence and emergence speed index was also analyzed in a greenhouse under a sand bed. The physiological seed quality data were submitted to analysis of variance and, afterwards, submitted to the Tukey average test. Genetic-statistical analyzes were performed in the Genes Program (CRUZ, 2016). All the characters under study had medium to low heritability results, and the highest results were obtained for APF and WTG in the two combinations, being influenced by five and three genes, respectively. F2 populations have transgressive segregants for all the characters, except for NDM in combination 2. The combinations 1 and 2 allow the selection of superior individuals to be obtained in terms of precocity, height, number of nodes and productivity components, being promising genotypes in a soybean breeding program. The segregating populations did not present superior results in relation to the parents as to seed quality.