![Nickel in a tropical soil treated with sewage sludge and cropped with maize in a long-term field study [An article from: Soil Biology and Biochemistry]](https://www.ebooknetworking.net/books/B00/0PD/bigB000PDYMKQ.jpg)
Nickel in a tropical soil treated with sewage sludge and cropped with maize in a long-term field study [An article from: Soil Biology and Biochemistry]
Description
This digital document is a journal article from Soil Biology and Biochemistry, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Sewage sludge produced by the SABESP wastewater treatment plant (Companhia de Saneamento Basico do Estado de Sao Paulo), located in Barueri, SP, Brazil, may contain high contents of nickel (Ni), increasing the risk of application to agricultural soils. An experiment was carried out under field conditions in Jaboticabal, SP, Brazil, with the objective of evaluating the effects on soil properties and on maize plants of increasing rates of a sewage sludge rich in Ni that had been applied for 6 consecutive years. The experiment was located on a Typic Haplorthox soil, using an experimental design of randomized blocks with four treatments (rates of sewage sludge) and five replications. At the end of the experiment the accumulated amounts of sewage sludge applied were 0.0, 30.0, 60.0 and 67.5tha^-^1. Maize (Zea mays L.) was the test plant. Soil samples were collected 60 d after sowing at depths of 0-20cm for Ni studies and from 0 to 10cm and from 10 to 20cm for urease studies. Sewage sludge did not cause toxicity or micronutrient deficiencies to maize plants and increased grain production. Soil Ni appeared to be associated with the most stable fractions of the soil organic matter and was protected against strong extracting solutions such as concentrated and hot HNO"3 and HCl. Ni added to the soil by sewage sludge increased the metal concentration in the shoots, but not in the grain. The Mehlich 3 extractor was not efficient to evaluate Ni phytoavailability to maize plants. Soil urease activity was increased by sewage sludge only in the layer where the residue was applied.
Description:
Sewage sludge produced by the SABESP wastewater treatment plant (Companhia de Saneamento Basico do Estado de Sao Paulo), located in Barueri, SP, Brazil, may contain high contents of nickel (Ni), increasing the risk of application to agricultural soils. An experiment was carried out under field conditions in Jaboticabal, SP, Brazil, with the objective of evaluating the effects on soil properties and on maize plants of increasing rates of a sewage sludge rich in Ni that had been applied for 6 consecutive years. The experiment was located on a Typic Haplorthox soil, using an experimental design of randomized blocks with four treatments (rates of sewage sludge) and five replications. At the end of the experiment the accumulated amounts of sewage sludge applied were 0.0, 30.0, 60.0 and 67.5tha^-^1. Maize (Zea mays L.) was the test plant. Soil samples were collected 60 d after sowing at depths of 0-20cm for Ni studies and from 0 to 10cm and from 10 to 20cm for urease studies. Sewage sludge did not cause toxicity or micronutrient deficiencies to maize plants and increased grain production. Soil Ni appeared to be associated with the most stable fractions of the soil organic matter and was protected against strong extracting solutions such as concentrated and hot HNO"3 and HCl. Ni added to the soil by sewage sludge increased the metal concentration in the shoots, but not in the grain. The Mehlich 3 extractor was not efficient to evaluate Ni phytoavailability to maize plants. Soil urease activity was increased by sewage sludge only in the layer where the residue was applied.
