The integration between agriculture and cattle-raising in some areas can restrict the use of no-tillage system in clayey soils, due to soil surface compaction, which restricts root growth and limits crop yield. The objective of this study was to evaluate the changes in soil physical properties and maize parameters caused by animal trampling preceding the summer crop, under two tillage systems. The degree of degradation of the cultivated soil compared to the native forest was also evaluated. The experiment was […]

The study of the effects of soil tillage systems on some physical and chemical properties of a Typic Paleudal and on cassava yield (Manihot esculenta, Crantz) was carried out in the northwest of the state of Paraná, Brazil in 1994/95 and 1996/97. Three soil tillage systems were used: (a) no-tillage; (b) minimum tillage (field cultivator and disc harrowing); and, (c) conventional tillage (mouldplowing and disc harrowing). A randomized complete block experimental design with six replications was used. Higher macroporosity values in the 0.10 m […]

The influence of no-till (NT) and conventional tillage (CT) systems, native forest (NF) and grassland (G), on the population density and biomass of Oligochaeta Amynthas spp., at Campos Gerais in the state of Paraná, Brazil, was evaluated monthly between February 1993 and January 1994. For the NT and CT systems, the areas were cultivated with corn, triticale and soybean, while, the native field consisted of vegetation of steppes of low grasses and a range forest of gallery forest. The population […]