Field experiments involving soils require previous verification of the soil spatial variability. The objective of this research was to study the spatial variability of soil physical properties of an experimental plot using geostatistics. The experiment was conducted in 1982 at the Experimental Center of the Instituto Agronômico in Campinas, state of São Paulo, Brazil, on a Red Latosol (Rhodic Ustox) under conventional tillage in a 30 x 30 m area, with sampling points arranged in a 5 m square grid. The analyzed properties were […]

Although the value of sewage sludge (SS) as a fertilizer has long been recognized, it is still a matter of considerable concern, in view of the danger of excessive heavy metal uptake by plants, whereby these elements gain entry into the food chain. From 1983 to 1987, a field experiment was carried out in a split block design with four replications to evaluate grain and dry matter yield and heavy metal uptake by corn (Zea mays L.) grown on a […]