Lillian França Borges Chagas

Eficiência agronômica de estirpes de rizóbio inoculadas em feijão-caupi no Cerrado, Gurupi-TO

The interaction of cowpea with atmospheric N fixing bacteria can increase productivity and reduce production costs. In this study, it was evaluated in the field, the agronomic efficiency, through the accumulation of biomass of shoot, root, number and biomass of nodules, relative efficiency and productivity of three cultivars of cowpea (BRS New Era, BRS vibrant and Vinegar), in independent experiments, inoculated with five strains of rhizobia, BR 3302 (UFLA 3-84), BR 3301 (INPA 03-11B), BR 3262, BR 3299 and BR 3267, two controls, control and fertilized with nitrogen (50 kg of N ha -1 ) for each experiment, in blocks. For each cultivar the response of each strain inoculated varied within traits. However, strain BR 3302 showed a constant on the characteristics of biomass and productivity assessed, to cultivar Nova Era in Experiment 1, with values near the fertilized soil. For the cultivars Pujante and Vinagre, in experiments 2 and 3, respectively, were also observed satisfactory results with the inoculation of strain BR 3302, with productivity about 22 and 11% higher than the treatment fertilized with nitrogen in each experiment, however, did not differ on the other strains inoculated. The mean of three independent experiments, were observed grain yields of cowpea of 743 and 826 kg ha -1 for the treatments with nitrogen and the treatment inoculated with strain BR 3302, respectively. Thus, strain BR 3302 provided the best results for the three cultivars of cowpea.

Fungos micorrízicos arbusculares afetando a produção de mudas de pinhão-manso na região sul do Estado de Tocantins, Brasil

Arbuscular mycorrhizal fungi inoculation on physic nut seedling production in Southern Tocantins State, Brazil This study aimed to evaluate the effects of the inoculation of four species of arbuscular mycorrhizal fungi on growth and nutrient status of seedlings of Jatropha curcas L. The experiment consisted of 12 treatments and 10 replicates inoculated with one and two of the mycorrhizal species Scutellospora calospora, Glomus clarum, Gigaspora margarita, Acaulospora morrowiae, with a mixture of the four species (MIX) and a non-inoculated control. After 75 days of plant emergence, significant differences (P < 0.05) were observed for contents ‘of nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), sulfur (S), manganese (Mn) and boron (B), especially for the inoculation with G. clarum and A. morrowiae, both alone and dual inoculation. The highest means (P < 0.05) of biomass of shoots and root, mycorrhizal colonization and mycorrhizal ef ficiency were found in the treatment with G. clarum and A. morrowiae inoculated separately and for the dual inoculation of S. calospora + G. clarum and G. clarum + A. morrowiae.