Mestrado em Agronomia (EA)
URI Permanente para esta coleção
Navegar
Navegando Mestrado em Agronomia (EA) por Por tipo de Acesso "Attribution-NonCommercial-NoDerivs 3.0 Brazil"
Agora exibindo 1 - 4 de 4
Resultados por página
Opções de Ordenação
Item Propriedades fisiológicas e físico-químicas durante armazenamento de soja e milho com diferentes tecnologias de semente(Universidade Federal de Goiás, 2020-02-19) Prado, Priscylla Martins Carrijo; Santos, Marivone Moreira dos; http://lattes.cnpq.br/53768629323515; Caliari, Márcio; http://lattes.cnpq.br/3558164788327179; Soares Júnior, Manoel Soares; http://lattes.cnpq.br/0920319108540253; Santos, Marivone Moreira dos; Soares Júnior, Manoel Soares; Souza, Eli Regina Barboza de; Ribeiro, Alline Emannuele ChavesSoy and corn, as they are of great importance in the Brazilian economy, are genetically improved (transgenic) in order to facilitate crop management and provide greater yields for the producer. However, post-harvest information on these technologies is still scarce, since transgenic seeds have been showing a significant decrease in their quality during storage, compared to conventional cultivars. Based on this information, the objective of this research was to evaluate changes in the physiological and physical chemical properties of soybean and corn seeds during storage under controlled conditions (temperature of 12 ° C ± 2 and relative humidity of 70% ± 5) and without control (environmental conditions). Periodic analyzes of germination, tetrazolium, electrical conductivity, humidity, ash, lipids, protein, pH, acidity, water and color activity were carried out during 360 days. The storage time and condition caused changes in most of the physicochemical characteristics and in all the physiological properties evaluated of the soybean seeds of cultivars NS 7780 IPRO, BRS 284, Desafio RR and corn of cultivars 30S31, 30S31 VYHR and AG 5055 PRO. The environmental conditions in which the seeds were submitted preserved the germination of the soybean cultivar NS 7780 IPRO and of the corn cultivars 30S31 VYHR and AG 5055 PRO for only 90 days; BRS 284 and Desafio RR cultivars for 180 days; and the conventional corn cultivar (30S31) was not affected during the 360 days of storage. Under controlled conditions, the physiological properties of the soybean cultivar NS 7780 IPRO, the viability and germination of the soybean cultivar Desafio RR and the corn cultivars 30S31 and AG 5055 PRO were maintained throughout storage. But the viability of the seeds of the soybean cultivars BRS 284 and corn AG 5055 PRO and the vigor of the soybean cultivar Desafio RR were preserved for 180 days, the germination of the seeds of the corn cultivar 30S31 VYHR was maintained for 270 days; while the other physiological properties remained below that required for commercialization since 90 days.Item Influência da temperatura do ar e da umidade do solo na eficácia de aplicações foliares de inseticidas para o controle de Bemisia tabaci Biótipo B(Hemiptera: Aleyrodidae) em soja(Universidade Federal de Goiás, 2020-06-25) Santilli, Caio Chinelatto; Quintela, Eliane Dias; http://lattes.cnpq.br/7426637066408803; Quintela, Eliane Dias; Barrigossi, José Alexandre Freitas; Czepak, CeciliaThe ubitiquous Bemisia tacaci biótipo B, causes economical losses to many crops. The development of this pest is favored in hot climates and in seasons of low rainfall and high temperatures. These abiotic factors cause plant stress, change their metabolism and can effect the insecticides efficacy for its control. This study aims to verify the air temperature (10, 15, 17, 20, 23, 25, 28, 31, 35 and 36 °C) and soil moisture (13, 19, 25, 38 e 50% of field capacity) effects on the efficacy of sintetic insecticides for the control of nymphs and adults of whitefly in soybeans. Active ingredients in simple formulation or in mixture (with new mode of action) were tested: cyantraniliprole (100 g a.i./L), pyriproxyfen + acetamiprid (100+200 g a.i./L), pyriproxyfen (100 g a.i./L), abamectin (18 g.a.i./L) e cyantraniliprole + abamectin (60+18 g a.i./L). Mortalities of adults by the insecticides were higher at 35-36°C in comparison to 15, 20, 23, 25 and 28-30°C. The LT50 was lower for the insecticides at 35-36°C compared to the other temperatures, varying from 12.8 (35±0.3 ºC) to 53.6 (10±0.8 ºC) hours. In general, some insecticides killed more adults and nymphs at the lowest soil moisture (25%) and it was not observed soil moisture effect for the other Insecticides. At 13 and 19% soil moistures, the plants dried up and it was not possible to evaluate the effect of soil moisture on insecticides efficacy. The LT50´s ranged from 1.9 to 3.3 (25%) and 2.1 to 2.7 (50%) and for nymphs ranged from 3.3 to 6.9 (25%) and 2.1 to 2.7 (50%) days. Therefore, high temperatures and water stress enhanced insecticide efficacy to whitefly. It can be concluded that high temperatures and periods of water plant restrictions do not affect insecticides efficacy against whitefly. But temperatures under ≤ 20 °C may diminish the insecticides efficacy and increase the median lethal time to kill whitefly adults.Item Atributos químicos e biológicos do solo em áreas sob diferentes sistemas de manejo no estado de Goiás(Universidade Federal de Goiás, 2020-04-17) Silva, Larissa Gabriela Marinho da; Leandro, Wilson Mozena; http://lattes.cnpq.br/9052207260053937; Brasil, Eliana Paula Fernandes; http://lattes.cnpq.br/7324619074753727; Leandro, Wilson Mozena; Calil, Francine Neves; Teixeira, Welldy GonçalvesAgroforestry systems have been one of the most promising options for the production of African mahogany, as they reconcile the planting of forest species with agricultural crops and / or animal husbandry, providing environmental, social and economic benefits. The objectives of this research was to evaluate the dynamics of the chemical and biological attributes of the soil in agroforestry systems with African mahogany, in comparison with soil under conditions of native vegetation in the municipality of Nazário - GO. The treatments were composed of three soil management systems: S1: African mahogany in monoculture since 2013; S2: African mahogany in an agroforestry system implanted since 2015, grown with cocktails of different species; S3: African mahogany in an agroforestry system implemented since 2013, grown with cocktails of different species. For the control treatment, the soil in the forest with native vegetation of the Cerrado (Mata) was evaluated. The chemical and biological attributes of the soils were analyzed in a randomized block design, with six replications. The results obtained indicate that the different management systems influenced the chemical attributes of the soil. The monoculture of African mahogany provided the largest accumulation of organic matter in the soil when compared to agroforestry systems and native vegetation, demonstrating its potential for the cultivation of this forest species. There were distinct changes in the biological attributes of the soil by each management system. The management systems with African mahogany in an agroforestry system implemented in 2015 (S2) and in 2013 (S3) had the highest carbon content of microbial biomass and basal soil respiration, respectively. The native forest had the highest nitrogen content in the microbial biomass. And African mahogany in a monoculture system had the highest total carbon content.Item Uso de biofertilizantes provenientes da cana energia e da cana-de-açúcar como alternativa para produção de crotalaria e soja(Universidade Federal de Goiás, 2018-03-01) Sousa, Jéssika Lorrine de Oliveira; Leandro, Wilson Mozena; http://lattes.cnpq.br/9052207260053937; Correchel, Vládia; http://lattes.cnpq.br/4781536691286837; Correchel, Vládia; Leandro, Wilson Mozena; Oliveira Júnior, Juarez Patrício de; Zang, Warde Antonieta da FonsecaThe large generation of waste from the sugar and alcohol industry has long been cause for concern with its adequate final disposal. Due to the composition of these residues with high contents of organic matter and nutrients one of the most efficient forms of destination is the addition to the soil as a source of fertilization, providing several nutrients to the crops. Another alternative is the anaerobic biodigestion, carried out to produce energy through the biogas generated in the biodigestion, that process originates from another residue (biodigested biomass concentrate) that may also have potential use as an organic fertilizer. Knowing the lack of information and research on the effects of this nutrient source on crotalaria and soybean crops, this work aims to improve the use of agricultural residues from the sugarcane sector and in other crops, and to evaluate the effects on soil chemistry of the application of vinasse and biofertilizer originating from the biodigestion of energy cane in the crotalaria and soybean crop in canevial reforestation. The experiment was conducted in a greenhouse of the UFG. An Eutrophic RED-YELLOW LATOSOL and a randomized block design were used, four doses of the biofertilizer (0, 0.5, 1, 2 and 3 times the recommended dose of 100 m3 ha-1) and a treatment with pure vinasse and the control, totaling 6 treatments with five replicates. The biofertilizer consisted of a blend of cane energy biodigested + vinasse in natura in different concentrations. The species used were Crotalaria juncea, as green manure, and Soy as a profitable crop, planted in 5 kg pots of soil. The applications were done every two days until the dose was completed. Crotalaria was cut at flowering, the leaves were separated for foliar nutritional analysis, the plant was weighed to determine green mass and dry mass of the aerial part and then it was placed in the vessel to supply organic matter. Samples of the initial soil and each treatment after each crop were cut, to determine macro and micronutrients. For the crotalaria, there was a positive response to the application of the biofertilizer in its development, with increase of the biomass production according to the increase of the dose, also presenting a higher leaf content of nutrients such as N, K and Zn, no symptoms of toxicity were observed with nutrients above adequate levels due to the rusticity of the species. For the soybean, there was also a significant response, reaching the optimum dose of 220 m³ ha-1, for larger values there was a drop in production. For both crops, the results of fresh vinasse resembled the lower doses of the biofertilizer and the control, without large increases of nutrients in the soil and leaf. For the soil variables, in general the biofertilizer presented efficiency in the availability of a large part of macro and micronutrients. Reduced acid values and pH increases and H + Al reduction occurred for soil in crops, in addition to a significant increase in base saturation and potassium (K), the most abundant nutrient in the residue used in the study.