Abstract
The objective was to evaluate the effect of tannery sludge vermicompost in the chemical properties of soil cultivated with tomato and irrigated with wastewater. The experimental design was completely randomized in a factorial 6 × 2, totaling twelve treatments with three replications. The treatments were: four tannery sludge vermicompost (25% Sludge tannery(LC) + manure - T1, 25% Sludge tannery(LC) + rice husk - T2; 50% Sludge tannery(LC) + manure - T3 and 50% Sludge tannery(LC) + cane gray - T4), conventional fertilization (T5) and control (without fertilization - T6) and two types of irrigation water (domestic sewage and class 2 water). The physico-chemical characteristics and chemical soil and vermicompost (fertilizers) were determined before the culture of the installation vessels and after ninety days of driving the tomato crop. The data were submitted to analysis of variance by F test and comparisons between treatment means were performed by 5% Tukey test. In general, concentrations of chemical parameters in the soil after addition of vermicompost have increased, particularly in the addition of T2 = 25% LC + 75% of rice husk and T4 = 50% LC + 50% cane gray. The treated soil demonstrated pH, CEC, organic matter and saturation enhanced base increased, sodium and potential acidity decreased. Thus it can be concluded that vermicompost used can be added to soil conditioners changing the soil chemical attributes positively. Key words: vermicomposting, chemical attributes, reuse.
Highlights
The soil conditioners may cause changes in the pH of the soil, converting the metals in forms not readily available to plants and microorganisms (Hamon et al., 2002)
The objective was to evaluate the effect of tannery sludge vermicompost in the chemical properties of soil cultivated with tomato and irrigated with wastewater
Any pH as the base saturation and exchange capacity are influenced by soil use and can be modified by managements correct as adding soil conditioners, which involves the application of material which favorably modify the chemical properties (Bernardi et al, 2005), reducing the soil acidity and increasing the CTC.As noted the CTC values increased after the addition of vermicompost to the soil, so that the witnesses had the lowest values compared to other treatments
Summary
The soil conditioners may cause changes in the pH of the soil, converting the metals in forms not readily available to plants and microorganisms (Hamon et al., 2002). Corroborating the proper disposal of waste that can be reused (such as wastewater), the provision of water in the soil for agronomic purposes, it is a technique that has been used in different countries (Metcalf and Eddy, 1991) This technique has some advantages such as conservation of water, with its wide availability and its ability to enable the intake and nutrient cycling ( reducing the need for commercial fertilizers), and contribute to the environmental preservation (Hespanhol, 2002), which together with the use of vermicomposts can assist soil conditioners as providing nutrients. As the disposal of waste a viable environmental issue that needs more attention, the vermicomposting process combined with the reuse of wastewaters emerge as biotechnology that may have high potential for use and nutritional value for tomato cultivation in Goiás In this sense, the objective of the experiment was to evaluate the effect of tannery sludge vermicompost in the chemical properties of soil irrigated with waster water and cultivated with tomato
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