The effects of different weed control methods in coffee (Coffea arabica L.) on some soil physical quality indicators were studied. The essay was installed in 1977 at the EPAMIG Experimental station in São Sebastião do Paraíso (MG), Brazil, in a coffee plantation on a Dusky Red Latosol. Coffee cultivar ‘Catuaí Vermelho’ LCH 2077-2-5-99 was planted at 4x1m spacing. Mower (RÇ), coffee tandem disk harrow (GR), rotary tiller (RT), post (HC) and pre-emergency herbicides (HR) and hand hoe (CM), were used […]

Additional soil compaction occurs when the pressure applied on the soil is greater than the preconsolidation pressure, causing the soil to deform along the virgin compression line. The objectives of this study were: to validate the model proposed by Dias Junior (1994); to propose a model to quantify soil mechanical resistance and; to evaluate the effect of soil use and moisture on the virgin compression line and on the compression index of three Latosols under annual crop, natural forest and […]

Soil compaction is a common problem that affects several soil properties and plant growth. In order to assess the effects of soil strength expressed by its mechanical resistance on roots, a growth chamber experiment was conducted at the Universidade Federal do Rio Grande do Sul, Porto Alegre, in 1994, during 35 days (530 GDD, 0ºC base temperature) on a typical Paleudult soil. Treatments, using pots arranged in a completely randomized design, consisted of soil compactions that resulted in resistances of […]

The effects of continuous sugarcane cropping on the physical and morphological properties of a clayey xanthic ferralsol were studied in the region of the Low Coastal Tablelands of Alagoas State, Brazil. Four sites were selected at Caeté mill, São Miguel dos Campos, State of Alagoas, Brazil, involving a native forest (Tn), and sugarcane fields, cultivated for periods of two (T2), eighteen (T18) and twenty-five (T25) years. The soils were morphologically characterized, and samples were taken from each horizon to determine […]