Compactação de solo cultivado com cana-de-açúcar em Baía Formosa, Rio Grande do Norte

Abstract

Soil compaction in a sugarcane field at Baía Formosa, Rio Grande do Norte, BrazilSoil compaction is one of the main constraints imposed to growth of sugar cane root system, with consequences as reduction on plant ability to absorb water and nutrients. In this context, this study had as objective to identify regions in the field with different compaction levels, allowing the adoption of site specific management. The work was carried out at the Green Valley Sugarcane Mill, in Baía Formosa, RN, Brazil. Soil penetration resistance (RSP) was used as indicative parameter of soil compaction, and was assessed in an area of 113.59 ha, divided in 12 sugarcane fields, where 113 georeferenced points were located. Determinations were made in the 0-10, 11-20, 21-30 and 31-40 cm depths, by means of a soil penetrometer with automatic data acquisition system. Data were analyzed through descriptive statistics and geostatistical tools, which were used for evaluating spatial dependence of variables and draw contour maps, after kriging interpolation. Contour maps show regions in the area with different soil compaction levels. Subsoiling may be avoided in 18.80% of the total area, mainly in the fields 45 and 48. In other regions subsoiling must be performed deeper than 40 cm.

Least limiting water range in Oxisol under two conservation tillage systems in sugarcane farming

“…For the determination of the LLWR, followed the procedures described by Pereira et al (2015), considering the upper limit to be the lowest value among the water content retained in the soil at a matric potential of -0.01 MPa (Reichardt, 1988), corresponding to field capacity (SWF C ) or the value at which the air-filled porosity (SWF C ) was 10% (Grable & Siemer, 1968). In turn which, the lower limit was considered to be the greatest value among the retained water contents at a matric potential of -1.5 MPa (Savage et al, 1996) in relation to the permanent wilting point (SW PWP ), and the soil moisture content at root penetration (SW PR ) reaches 2.0 MPa (Taylor et al, 1966;Pereira et al, 2015) and 4.0 MPa for sugarcane (Oliveira Filho et al, 2016).…”

“…Several authors studying the LLWR consider that a different critical PR of 2.0 MPa (Tormena et al, 1998;Betioli Junior et al, 2012;Araújo et al, 2013;Moreira et al, 2014). Oliveira Filho et al (2016) observed that values of PR less than 4.0 MPa should not cause damage to sugarcane plants growth. Araújo et al (2013), observed that raising the PR critical limit to 4.0 MPa in Oxisol, the LLWR would provide better conditions to the development of the sugarcane plants.…”

Estimativa do TVDI para avaliação das condições hídricas em áreas de produção de cana-de-açúcar no semiárido brasileiro.

“…A estimativa de produção do Brasil para a safra 2021/2022 é de 568,4 milhões de toneladas. Além disso, o setor sucroalcooleiro fomenta emprego e renda em várias regiões do país (Oliveira Filho et al, 2016;Miranda et al, 2019;Bezerra et al, 2020;Godoi Neto et al, 2020;Silva et al, 2021;CONAB, 2022;Gurgel et al,2022;Kohler et al, 2022).…”

Resistência à penetração em solo sob pastagem degradada

“…Dentre os diversos indicadores de qualidade física em solos manejados, direta ou indiretamente relacionados ao estado compactação do solo, a resistência à penetração (RP) medida por um penetrômetro tem sido a metodologia mais aplicada e tem se mostrado eficiente na localização e quantificação de camadas adensadas ou de restrição mecânica ao pleno crescimento radicular das plantas ROLOFF, 1996;OLIVEIRA FILHO et al, 2016). Isso, em razão da rapidez, facilidade, baixo custo e carácter pouco invasivo na obtenção dessa variável (CAMARGO;ALLEONI, 1997;OLIVEIRA et al, 2007), além da considerável correlação entre a resistência do solo à penetração e o desenvolvimento das raízes encontrada por diversos pesquisadores de Taylor et al (1966) a Costa et al (2012).…”