Limitações nutricionais de mudas de mangostãozeiro.

Este trabalho teve o objetivo de avaliar, por meio da análise foliar, as limitações nutricionais para produção de mudas de mangostãozeiro. Após 12 meses do plantio, em condições de viveiro, com sombreamento no início do desenvolvimento, foi observado amarelecimento progressivo das folhas novas, com diminuição significativa dos teores foliares de Fe e Mn

Enraizamento de estacas de mangostão com diferentes concentrações de auxinas.

Ensaio para verificar a possibilidade de obtencao de estacas enraizadas de mangostao sob nebulizacao intermitente de auxinas. Os resultados preliminares indicam a possibilidade de obtencao de mudas de estacas enraizadas de mangostao, embora haja necessidade de ensaios mais elaborados, onde serao estudados os tipos de estacas, epocas e dosagens de fitormonios. Mesmo obtendo-se taxas de enraizamento nao muito altas, o tamanho da muda obtida pelo tratamento com fitormonio equivale a uma muda de um ano proveniente de sementes apomiticas, o que valida os resultados obtidos e corrobora com a continuidade da pesquisa.bitstream/item/89231/1/PA-35.pd

Lowland rice genotypes evaluation for nitrogen use efficiency in brazilian acid soil.

Nitrogen is one of the most yield limiting nutrients in rice production under ali agro-ecological conditions. A greenhouse experiment was conducted to evaluate N responses to 12 lowland rice genotypes. Soil used in the experiment was an Inceptisol. The N rates used were Omg kg' (low) and 300 mg kq' (high) of soil. Straw yield, grain yield and panicle density were significantly increased with the addition of N fertilization and genotype treatment. The N X genotype interaction also was significant for these traits, indicating different responses of genotypes with variation in N rates

Lowland rice genotypes evaluation for nitrogen use efficiency in brazilian acid soil.

Nitrogen is one of the most yield limiting nutrients in rice production under ali agro-ecological conditions. A greenhouse experiment was conducted to evaluate N responses to 12 lowland rice genotypes. Soil used in the experiment was an Inceptisol. The N rates used were Omg kg' (low) and 300 mg kq' (high) of soil. Straw yield, grain yield and panicle density were significantly increased with the addition of N fertilization and genotype treatment. The N X genotype interaction also was significant for these traits, indicating different responses of genotypes with variation in N rates