Nitrogen is a plant nutrient of great importance. To determine optimum N levels for wheat, a field trial was carried out in a Red Latosol, during the winter of 2005, at Embrapa Cerrados, Planaltina (DF – Brazil). The experiment was set up in a randomized block design, with six replications and the treatments consisted of six N doses (0, 70, 140, 210, 280 and 350 kg ha-1). Soil samples were collected in the 0-20 cm and 20-40 cm layers and three different chemical extractors […]

Dumps of waste and sterile matter from mine activities are potential sources of environmental contamination with their contents of heavy metals and arsenic, especially when these materials contain sulfide minerals and high metal levels. The objective of this study was the characterization of refuse from a gold mine area in the State of Minas Gerais, Brazil, in order to evaluate acid drainage and metal solubilization problems, and local revegetation planning. Surface samples (0-20 cm) were collected and submitted to routine […]

Total and soluble boron contents were evailable by means of three extractors, used as plant availability indexes, in order to study their relationships with soil properties in representative mapping units of the state of Ceará, Brazil. Composite soil samples from the surface soil layers (0-20 cm) of Quartz Sands (AQd), Alluvium (Ae), Planosol (PL), Bruno non Calcic (NC), Cambisol (Ce), Red-Yellow Podzol (PV), Red-Yellow Latosol (LV) and Littosol (Re) were used. Total boron was determined after fusion with sodium carbonate […]