R ESU M ONeste trabalho o objetivo foi avaliar os efeitos da irrigação e da nutrição mineral no crescimento e produção do eucalipto (Eucalyptus grandis) cultivado na região do Triângulo Mineiro. O experimento foi conduzido na Fazenda Escola da Universidade de Uberaba, situada a 850 m de altitude, em Latossolo Vermelho Amarelo. Compararam-se tratamentos irrigados e não irrigados, com diferentes níveis de adubação (25, 50 e 100% das doses recomendadas, tanto em fertirrigação quanto em adubação convencional). Foram avaliados parâmetros de diâmetro à altura do peito e crescimento ao longo de cinco anos de condução do experimento e determinada a produtividade total de madeira, ao final deste período. Embora ao longo dos anos os resultados tenham sido estatisticamente diferentes observou-se, ao fim do período analisado, que tratamentos irrigados apresentaram maiores valores biométricos, além de maiores taxas de incremento médio anual (IMA). Proximidade de valores pode ter ocorrido em razão das chuvas excessivas no local, tornando a água mais disponível para os tratamentos não-irrigados. Palavras-chave: madeira comercial, irrigação, adubaçãoBiometric analysis of irrigated eucalyptus forests in the five initial years of development A B ST R A C T This research aimed to evaluate the effects of irrigation and mineral nutrition on the growth and production of eucalyptus (Eucalyptus grandis) cultivated in the Triângulo Mineiro region, Minas Gerais, Brazil. The experiment was conducted at the Farm School of University of Uberaba, which has 850 m of altitude, in Red-Yellow Latosoil. Irrigated and non-irrigated treatments with different nutritional conditions (25, 50 and 100% of the recommended doses) were compared. The parameters of diameter at breast height and growth were evaluated during the period of five years of experimentation, the final productivity of wood was also determined at the end of that period. Even though results were statistically different throughout the years, at the end of the analyzed period it was observed that irrigated treatments showed higher biometric values as well as largest rates of mean annual increment. Proximity of values may have occurred due to excessive rainfall at the site, increasing availability of water for the non-irrigated treatments.

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In many countries, the main reason for severely restricting or outright banning the land application of class B biosolids is the lack of risk assessment for adverse human health impacts. Among pathogens that are not often studied are helminth ova, including that of the spp. Almost all of the knowledge about the persistence of spp. ova in soils fertilized with biosolids is based on studies developed in North America, Europe, and Asia. These studies have almost always been conducted under temperate climate conditions, which may cause erroneous interpretations when the conclusions are extrapolated to tropical regions such as those found in Brazil. This team evaluated the persistence of viable spp. ova in a sandy Quartzipsamment tropical soil, previously planted with × hybrid () and fertilized with biosolids, over a 52-wk period. During the reporting period, the average temperature of soil and biosolids fluctuated between 15 and 30°C, and the average moisture of biosolids fluctuated between 60 and 90%. The estimated persistence time of viable spp. ova after land application was estimated at close to 7 wk, indicating that ova may not be viable for as long as it has been shown to be in studies of more temperate areas. The relationship of temperature with persistence of viable spp. ova in a tropical soil was stronger than moisture content, suggesting that temperature substantially contributed to their nonviability over the course of the experiment.

Abbreviations: CI, confidence interval; MPN, most probable number; PFU, plaqueforming unit; T1, immediate incorporation of biosolids into soil after application; T2, superficial application of biosolids followed by incorporation after 35 d; WTP, wastewater treatment plant.

The use of sewage sludge in agriculture and recovery of degraded areas has been shown as a promising alternative for its final destination. Studies on micronutrient levels after sludge application are necessary to avoid soil contamination at toxic levels. The objective of this work was to verify the micronutrient contents in the soil profile and pH, up to one-meter-deep, nine years after the application of sewage sludge and planting of native species of the Atlantic Forest. The experiment was implemented in a degraded Quartzeneic Neosol and conducted in randomized blocks with four replicates and eight treatments, consisting of six doses of sewage sludge (0, 2.5, 5, 10, 15 and 20 Mg ha-1, with supplementation of potassium due to low concentration in the residue), besides the control treatment, mineral fertilization and only potassium supplementation. After nine years, the contents of all micronutrients evaluated presented a significant response to the application of the treatments, and the application of sewage sludge provided an increase in their contents. Soil pH remained stable at sites receiving mineral fertilization and potassium supplementation. Only manganese and zinc showed mobility in the soil profile. The application of sewage sludge in degraded soil increases the micronutrient content and decreases its movement in the soil profile, and the application of the maximum dose of the residue does not provide toxic levels of these elements in the soil in the long term.