Produção de mudas de tomate cv. santa cruz em diferentes substratos

The objective of this study was to evaluate the competitiveness of two cultivars of upland rice drought-tolerant, cultured in coexistence with weed S. verticillata, under conditions of absence and presence of water stress. The experiment was conducted in a greenhouse at the Experimental Station of the Universidade Federal de Tocantins, Gurupi-TO Campus. The experimental design was completely randomized in a factorial 2 x 2 x 4 with four replications. The treatments consisted of two rice cultivars under two water conditions and four densities. At 57 days after emergence, were evaluated in rice cultivars and weed S. verticillata leaf area, dry weight of roots and shoots and total concentration and depth of roots. Was also evaluated in rice cultivars, plant height and number of tillers. Water stress caused a reduction in leaf area, the concentration of roots and vegetative components of dry matter (APDM, and MSR MST) of rice cultivars and Jatoba Catetão and weed S. verticillata. The competition established by the presence of the weed provided reduction of all vegetative components (MSPA, and MSR MST) of cultivars and Jatoba Catetão. It also decreased the number of tillers, the concentration of roots and leaf area. At the highest level of weed competition with rice cultivars, a greater decrease in vegetative components and leaf area of culture, regardless of water conditions.

O Estado do Tocantins tem-se destacado nos últimos anos como promissor em reflorestamentos com eucalyptus . Um dos problemas com grande destaque na silvicultura tocantinense é o amplo número de espécies infestantes (conhecidas comumente como rebrotas de Cerrado), resultantes de áreas recém-desmatadas. Objetivou-se com este trabalho avaliar o efeito da deriva simulada do herbicida triclopir e da mistura formulada triclopir + fluroxipir em mudas de clones de eucalipto, ambos em duas doses, correspondentes a 50 e 25% da dose de 7 L ha-1 p.c, recomendados tradicionalmente em pastagem. Foram avaliadas as variações em altura de plantas, variações de diâmetro do caule, relação altura/diâmetro, acúmulo de massa de matéria seca: de folhas, de caules, de ramos, de raízes e total. Os herbicidas afetaram negativamente o crescimento dos clones de eucalipto até os 28 dias após a aplicação. Com base nos resultados, pode-se concluir que o efeito da deriva é menor quando os herbicidas triclopir e fluroxipir + triclopir são aplicados, ambos na dose de 25%, diminuindo, assim, o risco de perdas.

Na cadeia produtiva de hortaliças, há atenção especial na formação ou obtenção de mudas de alta qualidade, pois estas são as responsáveis pelo bom desenvolvimento da cultura, pela produção e pela qualidade dos frutos.

The objective of the present work was to evaluate the technological quality of four sugarcane (Saccharum spp.) cultivars as a function of I.I. (Intensity of Infestation) of sugarcane borer (Diatraea Saccharalis). The design used was completely randomized with four treatments (CTC9001BT, CTC20BT, CTC9001 and RB975952) and six replications. The parameters evaluated were I.I. (Intensity of Infestation), °Brix (Contents of Soluble Solids), TCH (Total Sugarcane per Hectare), Fiber, Purity and Pol Broth (Apparent Sucrose). In I.I. (Intensity of Infestation) of Diatraea Saccharalis, cultivars CTC9001BT and CTC20BT showed the lowest percentages, with 0.71% and 0.89% respectively. In °Brix (Contents of Soluble Solids), there was no difference. In TCH (Total Sugarcane per Hectare), the CTC20BT variety had the highest result with an average of 79.63 t/h. In Fiber, cultivars CTC9001BT and RB975952 presented the highest averages, 12.86% and 13.09% respectively. Purity and Pol Broth (Apparent Sucrose) had no significant differences. In this study, different infestations of Diatraea Saccharalis had little influence on the technological quality of sugarcane varieties. Parameters such as °Brix (Contents of Soluble Solids), Purity and Pol Broth (Apparent Sucrose), had no differences, since the variables that differed were TCH (Total Sugarcane per Hectare) and Fiber.

The study aimed to evaluate post-harvest characteristics of parthenocarpic watermelon fruits obtained with use of 2,4-D, the experiment was conducted at the Experimental Station of the Federal University of Tocantins/Campus-Gurupi in the Department of Olericulture, located in the southern region of the State of Tocantins. The treatments consisted of five doses of 2,4-D (150, 175, 200, 225 and 250 mg L-1), plus a control treatment, which are the fruits obtained by natural fertilization. The characteristics were evaluated: average fruit weight; fruit shape; pattern of stripes; shell thickness in the distal region; External fruit color; total soluble solids (°Brix) and color of pulp. The plant regulator affected all evaluated characteristics. For fruit shape, pulp firmness, external coloring of the shell and pulp suffered less influence with the application of the regulator. Average fruit mass, bark thickness, ºBrix and striped pattern were the characteristics most affected by 2,4-D.