In some soils with low levels of exchangeable potassium, non-exchangeable forms can participate in plant supply. There is evidence that K supply in non-exchangeable forms depends more on plant nutrient demand than on soil properties. The purpose of this study was to evaluate the supply and depletion of K forms in a Cerrado Oxisol, as affected by residual K fertilization and successive cultivation of Brachiaria ruziziensis (Syn. Urochloa ruziziensis). Soil samples were collected in the 0-20 cm layer in plots […]

In Brazil, along with the expansion of clonal forestry, the management of more productive and more nutrient-demanding genotypes has led to the appearance of micronutrient deficiency symptoms, mainly of boron (B), and more recently, of copper (Cu) and of zinc (Zn), especially in Cerrado areas. The purpose of this study was to evaluate three extraction solutions to determine Zn availability (Mehlich-1, Mehlich-3 and DTPA pH 7.3) for eucalyptus seedlings grown in a greenhouse, on six Cerrado soil samples, and to […]

Sugar cane plays an important economic-social and political role in Brazil. This study aimed to evaluate the effect of manganese doses and sources on sugar cane. The experiment was conducted on the Sitio Fujimoto, an area administered by the Distillery Vale do Paraná S/A Alcohol and Sugar in Suzanápolis, São Paulo state. The experiment was arranged in a randomized block, 5 x 3 factorial design, with 5 manganese rates (0, 2.5, 5.0, 7.5 and 10.0 kg ha-1) and 3 sources […]

The cultivar Gold (MD-2) has attracted interest in Brazil, with a view to fresh pineapple export. However, little scientific information is available on the nutritional management of this cultivar in the country. This study aimed to determine the effect of N, P and K fertilization on the nutritional status, development, yield and fruit quality of MD-2 pineapple plants. Five doses of N; P2O5 and K2O, were studied and the leaf ‘D’ development, the N, P and K levels, and fruit […]

To synchronize nutrient availability with the requirements of eucalyptus during a cultivation cycle, the nutrient flow of this system must be well understood. Essential, for example, is information about nutrient dynamics in eucalyptus plantations throughout a cultivation cycle, as well as impacts on soil nutrient reserves caused by the accumulation and subsequent export of nutrients via biomass. It is also important to quantify the effect of some management practices, such as tree population density (PD) on these fluxes. Some nutrient […]

The negative impacts of the increasing volume of wastewater and of its discharge into the environment have become a worldwide concern. This study assessed the potential impacts of using treated effluent from pig raising for cotton irrigation, to evaluate their effects on soil chemical properties, and compare the results with those under conventional management. The experiment was conducted in an experimental area of the Company for the Development of the San Francisco and Parnaíba valleys “Perímetro Irrigado Formoso”, in Bom […]

Adequate nutrient levels in plants vary according to the species or clone, age and management practice. Therefore, adjustments of the nutrient solution are often necessary according to the plant material for multiplication. This study aimed to evaluate the influence of NPK fertilization on production and leaf nutrient contents of eucalyptus cuttings in nutrient solution. The study was conducted from November 2008 to January 2009 in a greenhouse. The experimental design was completely randomized fractional factorial (4 x 4 x 4)1/2, […]

In Brazil, along with the intensification of clonal forestry, the management of more productive and more nutrient-demanding genotypes has led to the appearance of micronutrient deficiency symptoms, mainly of Boron, and more recently, of Copper (Cu) and Zinc, especially in Cerrado areas. The purpose of this study was to evaluate three extractant solutions to determine Cu availability (Mehlich-1, Mehlich-3 and DTPA pH 7.3) for eucalyptus seedlings grown under greenhouse conditions in six Cerrado soil samples and to assess the influence of […]

Pasture is the main form of land use in Amazonia. Over time the pasture grass loses vigor and yields decrease, indicating a certain degree of degeneration. The main causes of degradation are lack of pasture maintenance and subsequent weed infestation, the choice of regionally unsuitable forage species and excessive grazing. The main purpose of this study was to evaluate the impact of different recovery managements on soil chemical properties and grass yield of a degraded pasture in Rondônia. For this […]

Little is currently known about modifications in edaphic characteristics caused by short-rotation eucalyptus and the impacts of these alterations on the sustainability of eucalyptus wood production. This study was carried out to identify theses changes at five sites of eucalyptus plantation in the region of the Rio Doce Valley, state of Minas Gerais, Brazil. Areas with more than three previous eucalyptus cycles, adjacent to pasture land or native forest, were chosen. Soil samples were collected and soil fertility analyzed by […]