Abstract:RESUMOOs solos dos tabuleiros costeiros cultivados com cana-de-açúcar, durante longo período de tempo, sob sistemas de manejo com diferentes aportes de matéria orgânica podem apresentar alterações nas propriedades físicas e químicas. O objetivo deste trabalho foi avaliar o efeito do aporte de matéria orgânica pelos diferentes sistemas de manejo da cana-de-açúcar sobre as propriedades físicas e químicas de um Latossolo Amarelo distrocoeso dos tabuleiros costeiros de Alagoas. Foram selecionadas áreas em talhões … Show more
“…Due to the great importance of organic matter to chemical, physical and biological properties of weathered soils, such as the oxisols, in tropical ecosystems (Vasconcelos et al, 2010), many studies aimed to understand the Walkley and Black (1934) (Cantarella et al, 2001). …”
The objective of this study was to evaluate the soil organic carbon fractions and the carbon management index (CMI) in a cohesive oxisol under different uses. Conventional cassava planting (CC), pasture (PP), and 7-and 12-year agroforestry systems (AF7 and AF12, respectively), were tested against secondary forest (SF). Soil samples of these areas were physically fractionated in order to determine total organic matter (TOC) as well as the labile-(LOC) and non-labile (NOC) fractions of the soil organic matter, as well as carbon management index (CMI). Total organic C ranged from 14.17 to 27.20 g kg -1 of soil, showing no differences in the surface layer among the land uses as compared to the secondary forest. No differences were found in the surface layer for LOC as well, except for the AF12 where LOC was higher. This condition accounts for higher microbial activity and nutrient cycling in the soil. This system also showed higher CMI values, pointing to a better response of soil quality under long-term agroforestry system. This system improved soil organic matter, regardless of the depth. On the other hand, conventional cassava and planted pasture systems reduced carbon in soil. In conclusion, the agroforestry system is the best choice of farmers, when they seek for better soil quality.
“…Due to the great importance of organic matter to chemical, physical and biological properties of weathered soils, such as the oxisols, in tropical ecosystems (Vasconcelos et al, 2010), many studies aimed to understand the Walkley and Black (1934) (Cantarella et al, 2001). …”
The objective of this study was to evaluate the soil organic carbon fractions and the carbon management index (CMI) in a cohesive oxisol under different uses. Conventional cassava planting (CC), pasture (PP), and 7-and 12-year agroforestry systems (AF7 and AF12, respectively), were tested against secondary forest (SF). Soil samples of these areas were physically fractionated in order to determine total organic matter (TOC) as well as the labile-(LOC) and non-labile (NOC) fractions of the soil organic matter, as well as carbon management index (CMI). Total organic C ranged from 14.17 to 27.20 g kg -1 of soil, showing no differences in the surface layer among the land uses as compared to the secondary forest. No differences were found in the surface layer for LOC as well, except for the AF12 where LOC was higher. This condition accounts for higher microbial activity and nutrient cycling in the soil. This system also showed higher CMI values, pointing to a better response of soil quality under long-term agroforestry system. This system improved soil organic matter, regardless of the depth. On the other hand, conventional cassava and planted pasture systems reduced carbon in soil. In conclusion, the agroforestry system is the best choice of farmers, when they seek for better soil quality.
“…It is recognized that the use of filter cake and vinasse, which are low cost materials, can improve soil fertility. Some authors even suggest that their use is beneficial to soil physical attributes, such as stability and average weighted diameter of aggregates [32]. It is possible to estimate the potential contribution of byproducts produced by the sugar-alcohol agroindustry to the annual recycling of nitrogen, phosphorus, and potassium in cultivated land with sugar cane in Brazil (Table 1).…”
Utilising organic residues in agriculture contributes to the conservation of natural resources by recycling carbon and mineral elements. Organic residues produced by the sugar and alcohol agroindustries have great potential for use in conservation agriculture. The production of sugar and alcohol generates large quantities of byproducts, such as filter cake and vinasse, which can be used as soil improvers and substitutes for inorganic phosphorus and potassium fertilizers. However, the use of these residues in agriculture requires specific recommendations for each pedoclimatic condition to prevent environmental damage.
“…Alterações nos limites de consistência do solo em razão das modificações nos teores de carbono orgânico também foram observadas por outros autores (Oliveira et al, 2010a;Vasconcelos et al, 2010), ao constatarem que o aumento da matéria orgânica tende a aumentar a área superficial específica do solo, o que proporciona maior retenção de água, levando-o a ter maiores valores para os limites de plasticidade do solo. Assim, os solos cultivados podem ter sua faixa de friabilidade reduzida devido à baixa na concentração de matéria orgânica, contribuindo para o aumento da compactação.…”
Propôs-se, neste trabalho, estudar a relação espacial de atributos físicos e mecânicos de um Argissolo Coeso cultivado com cana-de-açúcar. Estabeleceu-se um grid com 49 pontos georreferenciados para a retirada de amostras, em disposição 7 x 7, resultando uma malha de 120 x 120 m. As trincheiras foram abertas em duas camadas (0-20 e 20-40 cm) para a coleta das amostras deformadas e indeformadas. A distribuição normal foi verificada em todas as variáveis estudadas. Também se observou forte grau de dependência espacial para a maioria das variáveis. O limite de plasticidade apresentou efeito pepita puro. Os maiores alcances encontrados foram para o limite de liquidez (0-20 cm) e grau de compactação (0-20 cm) e os menores para umidade do solo (0-20 cm), IP e carbono orgânico (20-40 cm). Os mapas de krigagem apontaram correlação inversa entre densidade e porosidade e forte correlação entre argila e carbono orgânico, também entre a argila e os limites de consistência. Para a maioria das variáveis houve dependência espacial até 20 m indicando, para análises paramétricas, que as amostras devem ser coletadas em distâncias superiores a 20 m.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.