Exploiting solid phase extraction in a sequential injection system for phosphate determination in fertilized soil leachates

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Biomass production of Piatã grass (Brachiaria Brizantha cv. Piatã) on different degree days in Brazilian Northeast.

Brachiaria brizantha cv. Piatã was released from a Brazilian breeding program of Brachiaria genus to be a new option of forage plant for use in grasslands. This cultivar has been presented interesting strategy to persist on higher temperatures and water stress and can be useful for systems when water is not available in high quantity. For this reason this trial aimed quantifies biomass production on different degree days in Brazilian Northeast. This research was carried out in cultivate irrigated Brachiaria pasture at Embrapa Goats and Sheep (3º 41'S e 40º 20'W). Four experimental treatments were evaluated: 250ºC, 500ºC, 750ºC and 1,000ºC of degree days. Experimental design used was block complete randomized, with subplots and four repetition by plot. Degree days were obtained from temperature data collected in automatic station, daily. When amount of degree days was get in each treatment, grasses were cut and taken weight to estimate total biomass (kg/ha). Part of forage was dried in oven (55ºC) to get dry matter perceptual and another part was separate in stems, leaves and death material. Parameters evaluated were total biomass production (TBP) in kg/ha, leaves biomass (LB) in kg/ha, stem biomass (SB) in kg/ha and death material (DM) kg/ha. Data was collect for four cycles during dry season in 2012. Data was submitted to variance analysis (F test, p<0.05) and regression. There were significant effects (p<0.05) from treatment to biomass total, leaves biomass and death material. All parameter presented a linear pattern (YTBP= 1.26x + 23.95; R²= 0.99; YLB=0.94 x + 82.91; R2 =0.98; YDM= 0.04x ? 3.51; R²= 0.84). There were significant effect of interaction cycle and treatment to steam production during cycles two (C2) (YC2SB= -54.49 + 0.18x e R²= 0.73) and three (C3) (YC3SB = -206.28 + 0.76x e R²= 0.85). Most biomass produced was 1,284 kg/ha in 1,000ºC. This result occurred about 30 days. During a complete dry season in Northeast Region estimated a total biomass production from Piatã grass about 10.3t/ha while in native vegetation is less than 2t. Small cultivate areas with Brachiaria Piatã can produce forage sufficient to reduce grazing pasture in large native areas especially during dry season. 80% of forage total produced was basically leaves. Leaves are most nutritive part of plant. Piatã grass presented a high capacity to produce leaves in dry and high temperature environments. Most stem production during cycle two was 125.51 kg/ha while cycle three was 553.72kg/ha. During cycle three was observed increase cloudiness, probably affected stem production. Finally, There was produced just 36,5kg/ha death material in 1,000ºC. There is a linear effect of degree day on biomass production until 1,000ºC in Brazilian Northeast

Relação do teor de clorofila em feijoeiro irrigado com variáveis de solo e de folha.

O objetivo do presente trabalho foi correlacionar os teores de nutrientes de solo e de folha com os teores de clorofila das folhas do feijoeiro irrigado no município de Cristalina, GO.CONAFE

Atributos de solo em áreas comerciais cultivadas com o feijoeiro irrigado.

O objetivo do presente trabalho foi avaliar os níveis de fertilidade do solo cultivado com feijão irrigado no município de Cristalina, GO

Teores dos micronutrientes em áreas com feijoeiro irrigado no município de Cristalina, Goiás.

Este trabalho teve por objetivo a avaliação da fertilidade do solo de áreas com feijoeiro irrigado por meio das concentrações de micronutrientes determinadas por análise do solo e interpretadas pelo método dos níveis críticos, em áreas manejadas homogeneamente

Diagnóstico nutricional do feijoeiro irrigado pelo método dos níveis críticos no município de Cristalina, Goiás.

Este trabalho teve por objetivo a avaliação do estado nutricional do feijoeiro irrigado por meio das concentrações de nutrientes determinadas por análise foliar e interpretadas pelo método dos níveis críticos, em áreas manejadas homogeneamente

Determination of nitrate and nitrite in human saliva with a specially designed microfluidic paper-based analytical device (μPAD)

For many years, the concentration of nitrite and nitrate anions in human saliva was believed to be correlated with disfunctions and infections in the mouth. However, recent studies have reported some benefits to the presence of these ions in the oral cavity. In any case, there is a connection between the NOX salivary concentration and the human health and therefore it has become more and more relevant to understand this connection. Nowadays, there are several methods that allow this determination for a number of concentration ranges and types of samples, but these methods have limitations like requiring high volume of reagents and sample, the time of analysis, the use of complex lab equipment, the need of constant power, specialized technicians, the production of toxic waste, among others.info:eu-repo/semantics/publishedVersio

Microfluidic paper-based analytical devices for the determination of salivary NOx

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