Estado nutricional do arroz: efeito da época de início de irrigação.

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Absorção de nutrientes pelo arroz em resposta à época de início de irrigação.

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Adubação Nitrogenada para Cultivares de Mamona no Rio Grande do Sul.

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Manejo de animais e pastagens em sistemas de integração silvipastoril

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Efeito de iscas tóxicas utilizadas no controle de mosca-das-frutas sobre o estágio adulto do predador Chrysoperla externa (Neuroptera: Chrysopidae).

Este trabalho objetivou avaliar o efeito de iscas tóxicas empregadas no controle de mosca-das-frutas sobre adultos do predador Chrysoperla externa

Inclusion of crushed corn grains and citrus pulp improves the quality of soybean silage

We aimed to evaluate the effect of the inclusion of corn and citrus pulp as additives in soybean silage made in plastic (PVC) tubes. The experimental design was completely randomized, with a 2x4 factorial arrangement consisting of two additive groups (corn and citrus pulp) and four inclusion levels (no inclusion, 7, 14 and 21%). The experiment was conducted at the Forage Sector of the Lageado Experimental Farm, Faculty of Veterinary Medicine and Animal Science, UNESP, Botucatu, SP, and chemical composition analysis was carried out at the Laboratory of Bromatology. The soybean variety used was BMX Potência RR. Mechanical harvest occurred at the R7 phenological stage, at a height of 15 cm, using a harvester equipped with a two-row platform. The material was chopped into medium particles of 3 to 6 mm. After 45 days, the silages were analyzed for dry matter, crude protein (CP), total digestible nutrients, pH, ethereal extract, neutral detergent fiber, acid detergent fiber, lignin, total dry matter loss, and total carbohydrates (CHOS). The inclusion of corn (21%) and citrus pulp (14 and 21%) reduced CP values (P<0.05). Control silage contained less CHOS (P<0.05). The inclusion of corn meal is better than citrus pulp to improve the values of soybean silage

Biomarkers for Mercury Exposure in Tropical Estuarine Fish

Several studies have evaluated human risks due mercury (Hg) exposure through fish consumption. However, relatively few studies have explored effects of environmental Hg concentrations in biota, especially tropical fish species. The aim of this work was to assess in situ hematological, biochemical and genotoxic effects in tropical fish due to environmental exposure to mercury in estuarine ecosystems. A total of 282 fishes were collected from September 2003 to October 2005 in two estuarine areas: Ribeira Bay (reference area - 22° 55’ to 23° 02’ S and 44° 18’ to 44° 26’ W) and Guanabara Bay (highly impacted area by human activities - 22° 40’ to 23° 00’ S and 43° 00’ to 43° 20’ E). Total mercury levels in fish from Guanabara were twice higher than in Ribeira bay for the catfish species Genidens genidens (Ariidae), with significant differences among areas after standardization using length intervals (exposure time indicator). The species Haemulon steindachneri (Haemulidae) showed the highest mercury concentration, reflecting its position in trophic chain. Among effect biomarkers, only haematocrit, global leucometry and micronucleus assays seemed to reflect the differences on mercury exposure among areas, what may support their use for evaluations of fish exposure to mercury compounds. However, it’s necessary both laboratory experiments to establish cause-effect relationship and a continuous in situ study to obtain more information, involving more trophic levels, searching for sensible species to mercury exposure

Seletividade de agrotóxicos recomendados na persicultura ao predador Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae).

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Frações densimétricas da matéria orgânica de um solo construído após mineração de carvão e recentemente vegetado.

O objetivo deste trabalho foi avaliar os estoques de carbono totais e nas frações densimétricas da matéria orgânica de um solo construído e vegetado com gramíneas, após a mineração de carvão