15 results

Zinc redistribution among soil fractions and concentration of available Zn in sewage sludge-treated soils

Josângela do Carmo Trezena de Araújo, Clístenes Williams Araújo do Nascimento

01/Jul/2005

One of the best options for final disposal of sewage sludge is its use for agricultural purposes. Excessive heavy metal concentrations in sludge, however, pose a risk to the environment. It is therefore important to determine not only the availability, but also the distribution of such metals in different soil fractions as a result of sludge application. Our study aimed at evaluating both the redistribution of Zn among soil fractions and the Zn-DTPA available concentration in sludge-incubated soils. Samples of […]

Sewage sludge doses and the root system of peach palm

Fernando Vinicio Armas Vega, Marilene Leão Alves Bovi, Gentil Godoy Júnior, Ronaldo Severiano Berton

01/Apr/2005

The effects of sewage sludge doses on the root system of peach palm were studied in a field experiment, in randomized complete blocks, carried out in Ubatuba, state of São Paulo, Brazil. The trial was set up in July 2001, with a density of 5,000 plants ha-1. The sewage sludge doses (79.7 % water content) were 0, 38, 76, and 152 t ha-1, which were equivalent to doses of 0, 100, 200, and 400 kg ha-1 of N. The treatments were applied in the planting furrow, and […]

Soil chemical alterations and growth of maize and bean plants after sewage sludge application

C. W. A. Nascimento, D. A. S. Barros, E. E. C. Melo, A. B. Oliveira

01/Apr/2004

Sewage sludge from wastewater treatments contains organic matter and plant nutrients that may play an important role in agricultural production and maintenance of soil fertility. The present study aimed to evaluate the effect of increasing sewage sludge rates on soil chemical properties, heavy metal concentration in soils and plants, and the growth of maize and bean plants cultivated in pots under greenhouse conditions. Two soil types with different clay contents were used for application of six sewage sludge rates (equivalent […]

Agronomic alternative use for the biosolid generated in the Federal District. I – its effect on corn production and heavy metal incorporation in a cerrado oxisol

J. E. Silva, D. V. S. Resck, R. D. Sharma

01/Jun/2002

Brasilia’s urban growth has caused the increase of domestic sewage sludge, production generating a large volume of biosolid – a final product of sludge treatment – deposited at the Companhia de Saneamento de Brasilia (CAESB) sewage treatment plants. Although there is still a lack of technical data on health, environmental safety and economic viability, it has been used as a soil amendment and fertilizer by farmers in the neighbouring areas. The biosolid produced at one of the sewage treatment plants […]

Agronomic alternative use for the biosolid generated in the Federal District. II – qualitative, economic and practical aspects of its use

J. E. Silva, D. V. S. Resck, R. D. Sharma

01/Jun/2002

The agronomic use of biosolid is considered an adequate alternative to its disposal and, although a technical knowledge about its fertilizing properties is already available, information on its qualitative, economical and practical aspects for its use on the field is also needed. The biosolid produced by the “Companhia de Saneamento de Brasília” (CAESB) showed an appreciable variability in nutrient concentration among each monthly sampling from August, 1995 to July, 1996 and among the sludge treatment plants (ETEs) where the biosolid […]

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