This study, covering 12 cultivations, was carried out at Embrapa Rice & Beans Research Center, Santo Antônio de Goiás, Goiás, Brazil, in an Oxisol, under center pivot, for six consecutive years. The effects of four soil tillage systems and six crop rotations on bulk density and soil porosity were evaluated. The experiment was conducted in a completely randomized design, using a splitplot arrangement, with three replications. The tillage treatments were: moldboard plough/harrow disc, moldboard plough, harrow disc, and no-tillage. Tillage […]

An experiment, covering 12 cultivations, was carried out at Embrapa Rice & Beans Research Center, Santo Antônio de Goiás, Goiás, Brazil, in an Oxisol under center pivot, for six consecutive years. The effects of four soil tillage systems and six crop rotations on pH in water, exchangeable Al and Ca + Mg, organic matter, extractable P, and exchangeable K were evaluated, using a completely randomized design, in a splitplot arrangement, with three replications. The tillage treatments were: moldboard plough/harrow disc, moldboard plough, […]

A field experiment was carried out from 1990 to 1994 in the experimental area of the Soil Department at the Federal University of Santa Maria, State of Rio Grande do Sul, Brazil, on an Hapludalf to evaluate the potential of some winter legumes as N suppliers to no-tillage corn. A completely randomized block design with split-plots was used, with the winter crops in the main plots and the N rates for corn in the split-plots. In the main plots, the […]

The direct consequences of inadequate soil management are erosion, productivity reduction and loss of sustainability. This study aimed to evaluate the resistance to penetration and permeability of soil to water under management systems used in the cerrado region. The study was conducted at Embrapa Corn and Sorghum, in Sete Lagoas (MG), using a cerrado phase, very clayey, typic dystrophic Red Latosol (Acrusthox). The native cerrado provided lower soil density, higher macroporosity, higher total volume of pores, and consequently, smaller resistance […]

The direct consequences of inadequate soil management are erosion, reduction of productivity and loss of sustainability. The indicators of soil structure quality are important tools for evaluating sustainability of management systems. This study aimed to evaluate the aggregation of typic dystrophic Red Latosol (Oxisol) under different management systems at cerrado region in Sete Lagoas, Minas Gerais, Brazil. Among the studied management systems, no-tillage presented higher percentage of aggregates in the > 2 mm class, smaller percentage in the < 2 mm and < 1 mm classes, […]

With the increase of corn cultivation under the no-tillage system, various cover crop species have been evaluated to obtain a soil cover that benefits corn under succession and no-tillage. The objective of this work was to evaluate the effect of three sowing densities of black oat (Avena strigosa Scheig) and common vetch (Vicia sativa) in associated crops and as isolated crops and three levels of nitrogen fertilization (N), applied on corn (0, 60 and 160 kg ha-1 of N). Dry […]

Raindrop impact and runoff are the active agents of water erosion, which is influenced by soil roughness and cover, crop type and tillage system. Conservation tillage reduces water erosion in relation to conventional tillage by means of surface roughness and cover. This work was conducted in Centro de Ciência Agroveterinárias, in Lages, Santa Catarina, Brazil, from January 1993, to October 1998 to quantify soil and runoff losses under natural rainfall in the following soil tillage downslope systems: no-tillage, chisel plow […]

Erosion is one of the main causes of soil degradation because of the transport of nutrients. The nutrients are transported by water either dissolved or adsorbed on the soil particles, and the erosion rate may vary according to the tillage system. This work was conducted at the Centro de Ciências Agroveterinárias in Lages, Santa Catarina, Brazil, from January 1993 to October 1998, to quantify the losses of phosphorus, potassium, calcium, magnesium and organic carbon due to erosion caused by natural […]

Urea and uan were side-dressed applied on the soil surface and incorporated (5-7 cm) to corn in a no-tillage system to study the balance of urea-N (15N) at harvest and measure the accumulated losses of NH3-N derived from these sources and from urea + KCl (solid) and uan + KCl (liquid), applied as 06-00-09 (N-P2O5-K2O) to the surface only. The treatments-originated from a factorial 1 + (2 x 2) + 2, with plot being + factorial 2 x 2 (two […]

Corn requires a high uptake of nitrogen. Because soil has a limited capacity to supply this N demand, other N sources as legumes and mineral fertilizers are used. Potentially, the association of these sources of N can contribute to agricultural sustainability. This work was carried out to evaluate the impact of tillage and cropping systems on N availability. A long-term experiment established on a Paleudult at UFRGS (RS), Brazil was used. This experiment had three tillage systems: conventional, minimum and […]