Sistemas de preparo e qualidade do solo em cana-de-açúcar

• Ano de defesa: 2022
• Autor(a) principal: Oliveira, Marcela Pacola [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Saccharum spp; Preparo profundo em faixa; Controle de tráfego; Compactação do solo; Calcário; Deep strip tillage; Traffic control; Soil compaction; Lime
• Link de acesso: http://hdl.handle.net/11449/239198

The intensification of mechanization in sugarcane cultivation has spurred the development of new technologies to mitigate the effects of soil compaction. Deep strip-till with traffic control has been adopted by the sugar-energy industry as an alternative for improving soil profile. However, few studies have evaluated the effects of deep soil preparation on soil structure and sugarcane yield. The objective of this study was to evaluate the residual effects of liming and soil preparation on soil physical attributes, soil organic matter quality and sugarcane stalk yield after four years of cultivation in a clayey soil. The experiment followed a randomized block design with four treatments and four replicates. The treatments were conventional tillage without liming (CT0), conventional tillage with liming (CT2), modified deep tillage without liming (DT0) and modified deep tillage with liming (DT2). Soil physical attributes, total organic carbon, physical fractionation of organic matter, soil microbial biomass and sugarcane yield were evaluated. Regardless of lime application, deep tillage in the planting band improved the soil porosity to a depth of 0.4 m and decreased the carbon content in the surface layer. Both soil preparation methods improved aggregate stability in the 0.2–0.4 m layer in the absence of liming. Conventional tillage increased the surface soil C content and the mineral-associated C content in deeper layers. Deep tillage with liming increased microorganism activity and decreased compaction throughout the soil profile. Overall, deep tillage with liming improved soil chemical attributes and increased cane yield.