The purpose of this study was to adjust equations that establish relationships between rainfall events with different duration and data from weather stations in the state of Santa Catarina, Brazil. In this study, the relationships between different duration heavy rainfalls from 13 weather stations of Santa Catarina were analyzed. From series of maximum annual rainfalls, and using the Gumbel-Chow distribution, the maximum rainfall for durations between 5 min and 24 h were estimated considering return periods from 2 to 100 years. The data […]

Plants differ in preference for mineral nitrogen forms for uptake and metabolism. In rice plants, this preference can be associated with the growth stage. This study aimed to evaluate the growth, N nutrition and yield of the rice cultivars BRS Colosso and BRSMG Conai in nutrient solution with different ratios of nitrate and ammonium. The experiment was arranged in a completely randomized design in split plots with four replications. The plots were represented by five N-nitrate (N-NO3–): N-ammonium (N-NH4+) ratios […]

Fertilizers and lime can carry several micronutrients as residual impurities, which can become a source of these elements for crops. This study quantified the concentrations of Zn, Cu, Fe, Mn, and Ni in fertilizers and lime sold in northeastern Brazil. The effect of these inputs on the indirect micronutrient supply to crops was evaluated. Extracts were obtained from 24 fertilizer and 26 lime samples, using the method 3051A (USEPA) and atomic absorption spectrophotometry for elemental analysis. A fertilizer sample (SRM […]

The soil distribution model of the landscape of the Distrito Federal (DF) is influenced by the geomorphological partitioning and geological substrate. The in-depth understanding of pedoforms helps in detailed or semi-detailed soil surveys and mapping of a region. The available pedological mapping of the DF, established in 1978, scale 1:100.00, is still the main source of pedological information of the DF, however, often it cannot meet the needs of the various soil studies, due to the low scale. Thus, the […]

Water is vital for plants. A reduction in water availability may affect crops transpiration and leaf growth. The objective of this study was to determine the response of transpiration and leaf growth to the fraction of transpirable soil water (FTSW) in two potato clones (an old and a new) adapted to Southern Brazil. Three experiments were carried out under a plastic shelter in Santa Maria, RS, Brazil, using two potato clones, an old (‘Macaca’) and a new (‘SMINIA793101-3’). Two of […]

The Technologies setting at Agricultural production system have the main characteristics the vertical productivity, reduced costs, soil physical, chemical and biological improvement to promote production sustainable growth. Thus, the study aimed to determine the variability and the linear and special correlations between the plant and soil attributes in order to select and indicate good representation of soil physical quality for forage productivity. In the growing season of 2006, on the Fazenda Bonança in Pereira Barreto (SP), the productivity of autumn […]

The arbuscular mycorrhizal association established between arbuscular mycorrhizal fungi (AMF-phylum Glomeromycota) and plant roots plays an essential role in plant survival and nutrition. In this review, the idea is outlined that the triad “riparian forest-carbon sequestration-arbuscular mycorrhizal fungi” should be taken into consideration as an environmentally compatible strategy for the recovery of areas formerly covered by riparian forests. We briefly discuss the soil classes found in riparian areas and the C input in terrestrial ecosystems. AMF play an important role […]

Continuous agricultural production in the Amazon region requires correction of soil acidity and understanding of the long-term interactions of liming with chemical soil properties. The objective of this study was to evaluate the immediate and residual effects of lime on annual crop production and soil properties of medium-textured Oxisols in the Brazilian Amazon. Field experiments were conducted at two locations in the Northeast of Pará from 2003 to 2008, one in the county of Terra Alta and the other in […]

Peatlands form in areas where net primary of organic matter production exceeds losses due to the decomposition, leaching or disturbance. Due to their chemical and physical characteristics, bogs can influence water dynamics because they can store large volumes of water in the rainy season and gradually release this water during the other months of the year. In Diamantina, Minas Gerais, Brazil, a peatland in the environmental protection area of Pau-de-Fruta ensures the water supply of 40,000 inhabitants. The hypothesis of […]

The soil physical quality is one of the factors that determine the agronomic, economic and environmental sustainability in long-term no-tillage systems (NT). Soil compaction has been discussed as a factor that contributes to a reduction in physical quality under NT. However, the use of NT can increase soil organic matter and lead to a continuous and stable porous system that mitigates the negative impacts of compaction. The purpose of this study was to evaluate the physical quality of an Oxisol […]