Aspectos qualitativos da água do Rio Poty na região de Teresina, PI.

O presente trabalho objetivou monitorar e avaliar a qualidade da água do Rio Poty, em Teresina (PI) para fins agrícolas em períodos extremos de temperatura e de precipitação. Coletaram-se amostras de água no rio em 10 pontos georreferenciados, da curva do conjunto residencial São Paulo (zona sudeste) até sua foz no Rio Parnaíba (zona norte), em um percurso aproximado de 23,7 km, de junho a dezembro de 2004. Determinou-se as variáveis físico-químicas: CEa, RAS e pH, além das concentrações de Cl-, HCO3 -, CO3 2-, Na+, Ca2+ e Mg2+. Os maiores valores da CEa (0,26 dS m-1) e da RAS (1,90 mmolc L-1)0,5 foram registradas no mês de outubro, devido ao baixo índice pluviométrico, período seco e eventual poluição antrópica. Pelo Teste de Kruskal-Wallis, constataram-se oscilações nas concentrações de HCO3 - (1,68 a 1,91 mmolc L-1) ao longo dos pontos amostrais. O carbonato de sódio residual (CSR) indicou que a água é apropriada para fins agrícolas (< 1,25 mmolcL-1)

Seleção de genótipos em uma população de melhoramento de manga rosa usando o método multivariado biplot.

Mango (Mangifera indica L.) trees stand out among the main fruit trees cultivated in Brazil. The mango rosa fruit is a very popular local variety (landrace), especially because of their superior technological characteristics such as high contents of Vitamin C and soluble solids (SS), as well as attractive taste and color. The objective of this study was to select a breeding population of mango rosa (polyclonal variety; &#8805;5 individuals) that can simultaneously meet the fresh and processed fruit Vmarkets, using the multivariate method of principal components and the biplot graphic

Fertirrigação nitrogenada e potássica na cultura da melancia.

Com o objetivo de avaliar o efeito da aplicação de diferentes dosagens de nitrogênio e potássio via fertirrigação por gotejamento sobre a produção e qualidade de frutos de melancia (Citrullus lanatus (Thumb.)

Structural changes in Latosols of the Cerrado region: II - soil compressive behavior and modeling of additional compaction.

Currently in Brazil, as in other parts of the world, the concern is great with the increase of degraded agricultural soil, which is mostly related to the occurrence of soil compaction. Although soil texture is recognized as a very important component in the soil compressive behaviors, there are few studies that quantify its influence on the structural changes of Latosols in the Brazilian Cerrado region. This study aimed to evaluate structural changes and the compressive behavior of Latosols in Rio Verde, Goiás, through the modeling of additional soil compaction. The study was carried out using five Latosols with very different textures, under different soil compaction levels. Water retention and soil compression curves, and bearing capacity models were determined from undisturbed samples collected on the B horizons. Results indicated that clayey and very clayey Latosols were more susceptible to compression than medium-textured soils. Soil compression curves at density values associate with edaphic functions were used to determine the beneficial pressure (o b) , i.e., pressure with optimal water retention, and critical pressure (ocrMAC), i.e., pressure with macroporosity below critical levels. These pressure values were higher than the preconsolidation pressure (op), and therefore characterized as additional compaction. Based on the compressive behavior of these Latosols, it can be concluded that the combined preconsolidation pressure, beneficial pressure and critical pressure allow a better understanding of compression processes of Latosols

Diversity, distribution and new records of freshwater and estuarine shrimp in the state of Amapá, eastern Brazilian Amazon region.

This study presents the freshwater and estuarine shrimp species that occur in the state of Amapá, in the eastern region of the Brazilian Amazon. The data were obtained through information contained in the Brazilian crustacean collections of the Institute of Scientific and Technological Research of the State of Amapá (IEPA) and the National Institute for Research in the Amazon (INPA) and the detailed examination of the listed specimens. All information contained in the log book and specimen labels were noted for the identification and mapping of occurrence areas in the region. A survey in the literature of the species previously recorded for Amapá was carried out. The diversity of freshwater and estuarine shrimp was composed of 21 species distributed in the following families: Alpheidae (Alpheus nuttingi), Euryrhynchidae (Euryrhynchus amazoniensis, Euryrhynchus burchelli, Euryrhynchus tomasi and Euryrhynchus wrzesniowskii), Lysmatidae (Exhippolysmata oplophoroides), Palaemonidae (Macrobrachium acanthurus, Macrobrachium amazonicum, Macrobrachium brasiliense, Macrobrachium carcinus, Macrobrachium jelskii, Macrobrachium inpa, Macrobrachium olfersii, Macrobrachium surinamicum, Nematopalemon schmitti, Palaemon carteri, Pseudopalaemon amazoniensis, Pseudopalaemon chryseus, Leander tenuicornis), Penaeidae (Xiphopenaeus kroyeri and Sergestidae) (Acetes marinus and Acetes paraguayensis). Alpheus nuttingi and L. tenuicornis were new records for the state of Amapá. This study contributes to the knowledge of the diversity and geographic distribution of decapod crustaceans in Amapá and highlights areas where there are gaps in collection, thus contributing to a better understanding of these invertebrates in the region

Padrões de distribuição global de Caligus müller, 1785 (Copepoda: Caligidae) associados a peixes teleósteos, com dados fisiológicos e histopatológicos e descrição de estratégias de tratamento.

Este estudo teve como objetivo analisar e identificar padrões globais de infestação e distribuição geográfica de Caligus em peixes teleósteos, além de investigar dados fisiológicos e histopatológicos e descrever estratégias de tratamento contra esses ectoparasitos descritos na literatura.Enbrapoa