English

Alberto Vieira De Azevedo Carlos,Dantas Neto Jose,Rejane De Queiroz Almeida Azevedo Marcia,Lucia Antunes De Lima Vera,Walker De Albuquerque Alves Wagner,Vieira Pordeus Roberto

doi:10.5897/ajar2014.9280

Abstract

Research found the effect of treated wastewater on chemical properties of the soil cultivated with cotton. The soil fertility was studied by using a randomized blocks experimental design in factorial scheme (4 x 2) with three replications, whose factors were four treated wastewater depths (278, 416, 554 and 692 mm) and two soil sampling times (before and after cultivation of colored cotton, with a rainfall of 89 mm during the crop cycle); while for the soil salinity, it was also used the experimental design in randomized blocks, but in factorial scheme (4 x 3) with three repetitions, being the factors the same four treated wastewater depths used in the fertility study, and three times of soil sampling (before and after the irrigation and after the rainfall period).  After irrigation with effluent of stabilization pond and a rainfall of 89 mm, the contents of P, K+, Ca2+, H+ and the capacity of cationic change of the soil increased, while the contents of Na+, Mg2+ and the sodium exchangeable percentage decreased. However, the electrical conductivity, the sodium adsorption ratio and the contents of calcium, magnesium, sodium, chlorides of the soil saturation extract decreased after five months of rains, which totalized 646 mm.   Key words: Reuse, irrigation, soil.

Highlights

IntroductionMapanda et al (2005), study the effect of long-term irrigation using wastewater on heavy metal contents of soils under vegetables, found that the magnitude of contamination, regulatory compliance and annual loadings of soils with copper (Cu), zinc (Zn), cadmium (Cd), nickel (Ni), chromium (Cr) and lead (Pb) where wastewater was used to irrigate vegetable gardens for at least 10 years
The urban domestic wastewater reuse aiming fertirrigation industrial crops as cotton is considered an alternative use and final disposition of this appeal and, at the same time, a way to increase the productivity of crops in fertirrigation areas, given the presence of nutrients as
It is unknown that the antagonistic effects of its implementation on the chemical characteristics of the soil, as well as the chemical characteristics that the soil will pass with the effects of seasonality

Summary

Introduction

Mapanda et al (2005), study the effect of long-term irrigation using wastewater on heavy metal contents of soils under vegetables, found that the magnitude of contamination, regulatory compliance and annual loadings of soils with copper (Cu), zinc (Zn), cadmium (Cd), nickel (Ni), chromium (Cr) and lead (Pb) where wastewater was used to irrigate vegetable gardens for at least 10 years. According to these authors, the annual heavy metal loading rates showed that within 5 to 60 years, all studied heavy metals would have exceeded their permitted limits in soils, depending on site. When the capacity of soils to retain toxic metals is reduced due to continuous loading of pollutants or changes in pH, soils can release heavy metals into groundwater or soil solution available for plant uptake (Mapanda et al, 2005). Kimberly and William (1999), report that the amount of heavy metals mobilized in a soil environment is a function of pH, clay content, organic matter content, cation exchange capacity and other soil properties making each soil unique in terms of pollution management

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