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-The objective of this work was to estimate the global radiation by simplified models for the state of Mato Grosso, Brazil. The parameterized coefficients of 15 simplified models were regionally calibrated to estimate the daily global radiation, based only on air temperature, using data from 28 automatic weather stations (AWS) of the network of the Brazilian Meteorology Institute, distributed throughout the different biomes of the state of Mato Grosso. The simplified models are mostly derived from the Hargreaves and Bristow & Campbell methods, with different parameterized coefficients to be calibrated. The coefficient of determination (R 2 ), the mean bias error (MBE), the root mean square error (RMSE), and Willmott's d index were used to evaluate statistical performance. For the recommendation of models per station and/or biome, the models were rated numerically Index terms: air temperature, Amazon, Cerrado, parameterized coefficients, solar radiation. Radiação global por modelos simplificados para o Estado de Mato GrossoResumo -O objetivo deste trabalho foi estimar a radiação global por modelos simplificados para o Estado de Mato Grosso. Os coeficientes parametrizados de 15 modelos simplificados foram regionalmente calibrados para estimativa da radiação global diária, com base apenas na temperatura do ar, a partir de dados de 28 estações meteorológicas automáticas (EMAs) da rede do Instituto Nacional de Meteorologia, distribuídas nos diferentes biomas do Estado de Mato Grosso. Os modelos simplificados avaliados foram derivados principalmente dos métodos de Hargreaves e Bristow & Campbell, com diferentes coeficientes parametrizados a serem calibrados. Para a avaliação do desempenho estatístico, foram empregados o coeficiente de determinação (R por dia e ajustamentos superiores a 65%.Termos para indexação: temperatura do ar, Amazônia, Cerrado, coeficientes parametrizados, radiação solar.

The objective of this study was to evaluate the water quality of the Caiabi River based upon the water quality index (WQI) and the trophic state index (TSI), considering seasonal and spatial variations, with the aim of determining the most appropriate monitoring design for this study site. Sampling for water quality monitoring was conducted at five points on the 163 Índices de qualidade da água e …

ABSTRACT:In a watershed there is space and climate variability within its catchment area, causing changes in water qualitative and quantitative characteristics. Thus, the hydrological data collected from a specific basin may be extrapolated to neighboring basins with similar physical characteristics, using techniques of hydrological regionalization. This study developed the flow regionalization in the Teles Pires Basin, using historic series and probabilistic models to verify the data adherence through the regression equations adjustment according to the hydrologically homogeneous regions. The linear and power regression models were tested, employing physical and climatic characteristics and then the best adjustments were selected based on coefficients of determination, adjusted coefficient of determination, significance by F-test and small number of variables in the equation. The physical characteristics of the basin, drainage area and mainstream length, and the climatic variable, annual total precipitation showed higher adjustments. These equations can provide subsidy for decision making in the process of water resource management.

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Resumo -O objetivo deste trabalho foi avaliar o desempenho de métodos de estimativa da evapotranspiração de referência (ETo), em diferentes condições de nebulosidade, no Município de Seropédica, RJ. Reference evapotranspiration estimates in different cloudiness conditions

RESUMO -Entre os fatores que limitam a produtividade do mamoeiro, destacam-se a disponibilidade de água e nutrientes minerais. Assim, o ajuste de uma lâmina de irrigação adequada para a cultura exige também o monitoramento do estado nutricional das plantas. O objetivo desse trabalho foi avaliar a resposta das diferentes lâminas de irrigação (0; 40; 80; 120; 160; 200 e 240% da ETo) sobre os teores de nutrientes nas folhas do mamoeiro 'Improved Sunrise Solo 72/12'. As avaliações dos teores de nutrientes no mamoeiro foram realizadas em junho de 1999, retirando-se amostras de duas plantas de cada tratamento, das quais foram analisados, separadamente, o limbo e o pecíolo foliar. Os resultados indicam que os teores de N, P, K, Ca, Mg, B, Na, Fe e Cu, no limbo, e os teores de N, P, Ca, Mg, S, B, Na e Fe, no pecíolo, variaram significativamente com a lâmina de água aplicada. A concentração desses nutrientes em função das lâminas de irrigação foi explicada, na maioria dos casos, por regressões lineares, decrescentes para N, K e Fe, e crescente para os demais nutrientes. A variação significativa dos teores de nutrientes, em função da irrigação, mostra a necessidade de estudos que permitam o ajuste da adubação à lâmina de irrigação empregada.Termos para indexação: análise foliar, nutrientes, mamoeiro, irrigação. NUTRIENTS CONTENTS OF THE 'Improved Sunrise Solo 72/12' PAPAYA UNDER DIFFERENT IRRIGATION SHEETS IN THE NORTH REGION OF RIO DE JANEIRO STATE, BRAZILABSTRACT -Among the factors that limit the productivity of the papaya tree, stand out the availability of water and mineral nutrients. Therefore, the adjustment of the appropriate irrigation depth for the culture also demands the accompaniment of the state nutritional of the plants. The objective of this work was to evaluate the response of the different irrigation depths (0, 40, 80, 120, 160, 200 and 240% of ETo) on the amounts of nutrients in the leaves of the papaya tree "Improved Sunrise Soil 72/12". The evaluations of the amounts of nutrients in the papaya tree were accomplished in June of 1999, by removing samples of two plants of each treatment, from which were analyzed, separately, the leaf blade and the petiole leaf. The results showed that the amounts of N, P, K, Ca, Mg, B, Na, Fe and Cu in the leaf blade, and the amounts of N, P, Ca, Mg, S, B, Na and Fe in the petiole leaf, varied significantly with the depth of applied water. The concentration of those nutrients, as a function of irrigation depths, was explained, in most of the events, by linear regressions, decreasing for N, K and Fe, and increasing for the other nutrients. The significant variation of the amounts of nutrients, as a function of irrigation, shows the need of studies that allow the adjustment of the manuring to the employed irrigation depth.Index terms: leaf analysis, nutrients, papaya tree and irrigation. INTRODUÇÃOA Região Norte Fluminense (NF) possui grande potencial de produção para frutíferas, incluindo o mamão. Além de apresentar situação logística apropriada, a região possui, também, ...