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The aim of this research was to evaluate the collembola development in soils with different levels of heavy metals, fuels and pesticides, in laboratory conditions. Treatments were: Cadmium - 1, 10 and 100mg kg-1 soil; Copper - 50, 500 and 5000mg kg-1 soil; Zinc - 100, 1000 and 10000 mg kg-1 soil; fungicide epoxiconazol + piraclostrobina - 1 and 2L ha-1; fungicide epoxiconazol - 0,75 and 1,5L ha-1; herbicide glyphosate - 2 and 4L ha-1; burned lubricating oil - 5, 50 and 100mL kg-1 soil and diesel oil - 5, 50 and 100mL kg-1 soil and control. In the 1mg kg-1 dose of Cd there was a great increase of the collembola population and the soil pH decreased as the Cd, Zn and Cu doses in the soil increased. In the presence on fuels the collembola presented incapacity to procreate regardless the dose applied in the soil. The number of collembola showed an increase with increasing glyphosate and epoxiconazole level. The heavy metal Cu and Zn have negative impact over the collembola population and just Cd (1mg kg-1 soil) offers increase on their population in the soil. The presence of burned oil and diesel in the soil inhibit the collembolan development in the soil. The pesticides glyphosate, epoxiconazol and epoxiconazol + piraclostrobina do not negatively influence the collembola population in the soil. [ABSTRACT FROM AUTHOR]

The successive application of pig slurry to pastures is a common practice in southern Brazil, serving as a method of waste disposal as well as an important alternative to chemical fertilization. Although there are economic benefits to the use of manure as fertilizer, it may be associated with environmental hazards and cause changes to composition and activity of soil fauna. This study aimed to study the effects of pig slurry on the soil biota of pastures. Composition and biological activity of pastures where manure was applied successively for 2 years (A2) and 14 years (A14) were evaluated, and native forest (NF) was analyzed as a reference area. Successive application of pig slurry to the soil changed its biological characteristics according to the time of implementation; influenced the composition and diversity of soil fauna, leading to an increase in the total number of individuals, especially springtails; and increased the activity of the soil biota, especially to a depth of 6cm. [ABSTRACT FROM AUTHOR]