Efeitos da nutrição mineral na competição inter e intraespecífica de Eucalyptus grandis e brachiaria decumbens: 1- crescimento

The present work was conducted with the objective to study the effects of mineral nutrition on Eucalyptus grandis and Brachiaria decumbens (#BRADC) growth, when submitted to inter- and intra-specific competition. The treatments consisted of two plants of Eucalypts/pot, two plants of BRADC/pot, and one plant of each species/pot. The plants were nourished with the Hoagland e Arnon (1950) complete solution; with no K, P or N; or only with either N, P or K. Sixty days after growing side by side, no effect of the inter- and intra-specific competition on eucalypts plant high, branch number and leaf dry mass was observed. When mineral nutrition did not limit plant growth (complete solution or solution with no K), intra-specific competition reduced on average, 23% of eucalypts root length, leaf area, and stem and root dry mass, and inter-specific competition reduced, on average, 75% of BRADC dry mass. When mineral nutrition became a limiting factor, no plant competition effect on the parameters studied was detected.

Potencialidades da utilização de taninos na conservação de forragens e nutrição de ruminantes-revisão

This review present a discussion abouth the tannins. The tannins are compounds that have the ability to bind other macromolecules, reducing their availability to animal metabolism. This characteristic can be benefic or deleterious, depending on the tannin concentration degree in the plant and its structure. Positive effects are mainly related with a better use of the dietary protein and an increased efficiency of microbial protein synthesis in the rumen. The use of tannins to reduce ruminal methane emission has been subject of current researches, firmly indicating a decrease of ruminal methanogenesis. However, many of these studies, carried out to evaluate the effects of tannins on forage fermentation and animal metabolism, are based on legume plants, so their results can not be surpassed to studies concerning tanniniferous grasses. By improving the characterization of the profile and reactivity of tannins in tanniniferous forages, such as some sorghum hybrids, as well as conducting experiments to demonstrate the effects of tannins on animal metabolism and performance, the real potential of forages with tannin will be enlightened.

La salud bucal en la percepción del adolescente

Objective An individual does not always experience the best health and vitality indexes during her/his adolescence. This study evaluated young people's awareness of their oral health and the factors involved in dental maintenance and promotion Material and Method Adolescents (n=493) from the Mirim Foundation in the town of Araçatuba in the state of São Paulo, Brazil, were asked to fill in a semi-structured questionnaire. Results 68.4 % of the youngsters interviewed regarded oral health as referring to hygiene and 16.2 % to physical appearance; 53.6 % of the group perceived their oral health to be good and 24 % optimum. 90.1 % indicated oral hygiene when asked how oral health could be ensured; however, only 4.8 % mentioned brushing their tongues. Physical appearance (62.9 %) was one of the main reasons stated as being important for teeth. A statistically significant relationship was observed between perception of regular dental and mouth health and having visited the dentist at least six months beforehand (x2=30.75; p<0.05). Conclusion Even though the youngsters had a general idea regarding their oral health, its maintenance and promotion, better information should be made available regarding such topics and be approached through health education so that these adolescents can have good oral health for the rest of their lives, as well as becoming knowledge multiplying agents for those who do not have access to the same information.

Desenvolvimento e nutrição do capim-Tanzânia em função da aplicação de zinco

It was aimed to assess the effects of zinc in the development and nutrition of Tanzania grass. The experimental design used was fully randomized, consisting of six doses of zinc (0, 15, 30, 60, 120 and 240 mg dm'3) and four repetitions. The experimental unit was formed in a vase filled with a Red Latosol dystrophic (Zn = 0.4 mg dm). There were two cuts, the first after 53 days of transplanting seedlings and the second 35 days after the first cut. Was evaluated the concentration of zinc in the soil, the content of zinc leaf, the number of tillers, number of leaves, plant height, the dry mass of the shoot, root system and the whole plant. The doses of zinc influenced the concentration of zinc in soil and plant, and production of dry mass of Tanzania grass, especially the first cut. The Tanzania grass shows high tolerance to the toxicity of zinc, and toxic critical level of 273 mg kg-1.

Omissão de macronutrientes na nutrição e no crescimento da cana-de-açúcar cultivada em solução nutritiva

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Aspectos sociales del embarazo y la fecundidad adolescente en América Latina

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El estudio de la salud reproductiva y los censos de 2010: la fecundidad adolescente y la mortalidad materna

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Fecundidad adolescente en Nicaragua: tendencias, rasgos emergentes y orientaciones de política

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Fertilizantes orgânicos e resíduo de bauxita na disponibilidade de nutrientes e nutrição da cana-de- açúcar irrigada com água potável e residuária

The objective of this study was to evaluate the effect of organic fertilizers (urban solid waste and swine manure) as a source of nutrients and residue from bauxite processing as a corrective of soil acidity, in area cultivated with sugar cane irrigated with potable water and served in the availability of phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S) levels in the soil and plants. For this experiment was carried out in pots, using a Alfisol, assessing the availability of the elements in the 0-20 cm layer and the concentration of these nutrients in the leaves of sugarcane. The data showed that the residues increased the concentrations of Ca and Mg in soil, as the concentration of K was not changed and S was not detected, due to the low concentration in the soil. In the leave +1 of sugarcane the residue of bauxite increased levels of N, P, K, Ca and Mg (15.68, 1.73, 10.43, 3.50 and 1.08 g kg-1, respectively). The application of urban solid waste and swine manure also increased the levels of N, K and Ca (11.56, 9.18 and 2.81 g kg-1, respectively). The quality of irrigation water did not alter the availability of P, K, Ca, Mg and S in the soil as well as the levels of these macronutrients in the plant.

Fecundidad adolescente, efectos individuales y determinantes cercanos: estudios de casos

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Modelo de atención interdisciplinaria del adolescente: un estudio de caso

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Aspectos sociales del embarazo y la fecundidad adolescente en América Latina

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Fecundidad adolescente y desigualdad en Colombia

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El estudio de la salud reproductiva y los censos de 2010: la fecundidad adolescente y la mortalidad materna

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