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EnglishBiochar has been used worldwide as an efficient soil amendment due to its beneficial interaction with soil particles and nutrients; however, studies on the effect of biochar on the availability of nutrients such as N and P in tropical soils are still missing. The objective of the study was to evaluate the effect of different types and doses of biochars on the concentration and uptake of N and P in Indian mustard plants (Brassica juncea L.) grown in a Cu contaminated soil during three successive growth cycles. The greenhouse experiment was set up as randomized block design in a 3x3 factorial scheme, with 3 types of biochars (coconut shell, orange bagasse and sewage sludge) and three rates of application (0, 30 and 60t ha-1), and 4 replicates. Biochar increased plant growth by approximately 30 to 224%; however, the orange bagasse biochar was the most effective. Biochar reduced plant N concentration in approximately 15-43%, regardless of the rate of application, indicating the need to carefully adjust N fertilization. In the last growth cycle, biochar from coconut shell and orange bagasse improved the N uptake efficiency suggesting a better amelioration effect with ageing in soil. Biochar did not affect P nutrition in Indian mustard to a great extent; however, it significantly decreased the N:P ratio in the plant. Key words: biochar; pyrogenic carbon; copper contamination; plant nutrition; Brassica juncea portuguesO biocarvao tem sido usado mundialmente como um eficiente insumo agricola devido a sua interacao benefica com as particulas e os nutrientes do solo. Contudo, seu efeito na disponibilidade de nutrientes como N e P em solos tropicais tem sido pouco investigado. O objetivo do estudo foi avaliar o efeito de diferentes tipos e doses de biocarvao na concentracao e na eficiencia de absorcao de N e P em plantas de mostarda indiana (Brassica juncea L.) cultivadas em solo contaminado com cobre, em tres ciclos sucessivos de cultivo. O estudo foi desenvolvido em delineamento de blocos casualizados, em esquema fatorial 3x3, em casa de vegetacao, com tres tipos de biocarvao (casca de coco, bagaco de laranja e lodo de esgoto) e tres doses (0, 30 e 60t ha-1). Todos os biocarvoes aumentaram o crescimento das plantas, com variacao de 30 a 224%. No entanto, o biocarvao de bagaco de laranja foi o mais eficiente. A presenca de biocarvao reduziu a concentracao de N nas plantas em torno de 14 a 43%, independente da dose aplicada, indicando a necessidade de monitoramento mais cuidadoso da fertilizacao nitrogenada. Os biocarvoes de casca de coco e bagaco de laranja melhoraram a eficiencia da planta na absorcao de N no terceiro ciclo de cultivo, indicando melhor efeito com o tempo de contato como o solo. O uso de biocarvao teve pouca influencia na nutricao fosfatada na mostarda indiana, mas diminuiu significativamente a relacao N:P. Palavras-chave: biocarvao; carbono pirogenico; contaminacao com cobre,nutricao de planta; Brassica juncea

Nitrogen and phosphorus uptake efficiency in Indian mustard cultivated during three growth cycles in a copper contaminated soil treated with biochar