Produção extemporânea de amora-preta com uso de reguladores vegetais e nitrato de potássio em regiões tropicais

Pós-graduação em Agronomia (Horticultura) - FCA

Propagação e desenvolvimento inicial defícus adhatodifolia Schott ex Spreng. (Moraceae) em diferentes temperaturas, intensidades luminosas e substratos

Pós-graduação em Agronomia (Horticultura) - FCA

Inibidores de etileno na pós-colheita de Lisianthus

Pós-graduação em Agronomia (Horticultura) - FCA

Desenvolvimento, produção e composição de óleo essencial da Mentha piperita L., cultivada em solução nutritiva com diferentes níveis de nitrogênio

Pós-graduação em Agronomia (Horticultura) - FCA

Trocas gasosas, biomassa, teor e composição do óleo essencial de folhas e raízes de Piper aduncum L. sob diferentes níveis de luminosidade

Pós-graduação em Agronomia (Horticultura) - FCA

Produção da cultura de alface irrigada com água tratada magneticamente

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Fertirrigação nitrogenada por gotejamento e época de aplicação foliar de ácido giberélico 'GA IND.3' em alface americana (Lactuca sativa L.)

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Critérios de manejo na irrigação do feijoeiro em três texturas de solo

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Eficiência no uso de água e de potássio no cultivo e na produção do morangueiro

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Morfologia e germinação de sementes de Caryota urens (Lam.) Mart. (Arecaceae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Estado nutricional de couve-flor ‘Verona’ submetida à omissão de macronutrientes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Avaliação agronômica de fontes e doses de fósforo para o capim-Tifton 85

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Avaliação do potencial de uso agrícola da fluorita com óxido silício (AgroSiCa), derivado da fabricação de fertilizantes fosfatados

Phosphate fertilizers are critical for crop production in tropical soils, which are known for having high phosphate-fixing capacity and aluminium saturation, as well as low pH and calcium contents. Fluorine is a component of many phosphate rocks used to make phosphate fertilizers, via a process that generates hexafluorosilicic acid (H2SiF6). While many treatment technologies have been proposed for removal of fluorine in industrial facilities, little attention has been given to a process of neutralizing H2SiF6 with calcium oxide aiming to find out an alternative and sustainable use of a by-product with a great potential for beneficial use in tropical agriculture. This study evaluated the effect of a by-product of phosphoric acid production (fluorite with silicon oxide, hereafter called AgroSiCa) in levels of phosphorus (P), calcium (Ca), silicon (Si), aluminum (Al) and fluorine (F) and some others parameters in soils as on growth of soybean and corn. Experiments were conducted in a greenhouse condition at the Federal University of Lavras (UFLA), Lavras, Minas Gerais, using different types of soils in tropical regions and different doses of AgroSiCa. The application of AgroSiCa resulted in a slight increase in soil pH and significant increases in calcium, phosphorus and silicon in the soil solution and the shoots of corn and soybeans. We also found very low levels of fluoride in all soil leachates. A significant reduction of labile aluminum levels found in all soils after the cultivation of corn and soybeans. In sum, AgroSiCa improved soil properties and contributed to better growth of both cultures. In sum, AgroSiCa improved soil properties and contributed to a better growth of both crops. Our results show that reacting H2SiF6 derived from the wet-process phosphoric acid production with calcium oxide leads to a by-product with potential for agricultural use, especially when applied in highly-weathered soils. Besides providing calcium and silicon to plants, the use of such by-product in soils with high phosphate-fixing capacity and high aluminium saturation delivers additional benefits, since fluoride and silicon can play an important role in improving soil conditions due to the formation of less plant-toxic forms of aluminium, as well as upon decreasing phosphate fixation, thus improving root development and making fertilizer-derived phosphate more available for plant growth.

Acidovorax citruli: genetic analyses and protocol for its detection in seeds

Bacterial fruit blotch of cucurbits (BFB), caused by the seed borne Gramnegative bacterium Acidovorax citrulli is a serious threat to cucurbit industry worldwide. Since late 1980`s after devastating outbreaks in watermelon fields in southern United States, BFB has spread worldwide and has been reported in other cucurbit crops such as melon, pumpkin, cucumber and squash. To date, there is evidence for the existence of at least two genetically and pathogenically distinct populations of A. citrulli. In Brazil, the first report of BFB was in 1991, in a watermelon field in São Paulo. Although widespread in the country, BFB has been a major problem to melon production. More precisely, BFB has caused significant yield losses to melon production in northeastern Brazil, which concentrates > 90% of the country`s melon production. Despite the management efforts and the recent advances in A. citrulli research, BFB is still a continuous threat to the cucurbit industry, including seed producers, growers and transplant nurseries. To better understand the population structure of A. citrulli strains in Brazil, and to provide a basis for the integrated management of BFB, we used pulsed-field gel electrophoresis (PFGE), multilocus sequence analysis (MLSA) of housekeeping and virulence-associated genes and pathogenicity tests on different cucurbit seedlings to characterize a Brazilian population of A. citrulli strains from different hosts and regions. Additionally, we conducted for the first time a comparative analysis of the A. citrulli group I and II population at genomic level and showed that these two groups differ on their genome sizes due to the presence of eight DNA segments, which are present in group II and absent in group I genomes. We also provide the first evidence to suggest that temperature might be a driver in the ecological adaptation of A. citrulli populations under nutrient-rich or -depleted conditions. Finally, in order to improve the routine detection of A. citrulli on melon seedlots, we designed a new primer set that is able to detect the different Brazilian haplotypes, thus minimizing the risk of false-negatives on PCR-based seed health testing.

Adubação nitrogenada e recomendação com medidor portátil de clorofila em algodão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)