SciELO - Scientific Electronic Library Online

vol.35 issue10Effect of limestone calcium and magnesium ratio on micronutrients in alfalfaForms, quantity/intensity ratio and bioavailability of potassium in different Latosols (Oxisols) author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921


SILVEIRA, PEDRO MARQUES DA; ZIMMERMANN, FRANCISCO JOSÉ PFEILSTICKER; SILVA, SILVANDO CARLOS DA  and  CUNHA, ADRIANY ALVES DA. Sampling size and spatial variability of chemical properties of a latosol subjected to different soil preparations. Pesq. agropec. bras. [online]. 2000, vol.35, n.10, pp.2057-2064. ISSN 0100-204X.

The study was conducted at the Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão, in Santo Antônio de Goiás, GO, Brazil, on a clayey Oxisol subjected to different soil tillage systems for five consecutive years and cultivated with corn in the summer and bean in the winter under sprinkler irrigation. The objective of this study was to determine the effects of three soil tillage systems, using moldboard plough, harrow disc and no-tillage. Forty nine soil samples were collected from a 7x7 lattice sampling area spaced 4 m x 4 m at 0-5 cm and 5-20 cm soil depth. Soil samples were analyzed for pH, Ca, Mg, P, K and base saturation. Minimum, maximum and average values were calculated along with the coefficient of variation and average values were compared by the t test. Values of pH, Ca, Mg, P, K and base saturation of soil varied for different treatments. All soil chemical properties values were higher at 0-5 cm soil depth in no-tillage treatment as compared to harrow disc and moldboard plough treatments. Among the soil chemical properties evaluated, P and K concentrations showed the highest variability, whereas pH presented the lowest.

Keywords : soil chemicophysical properties; mineral nutrients; soil pH; moldboard plough; disc harrows; direct sowing.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License