Chemical attributes of soil under cassava wastewater application in Marandugrass cultivation

João Virgínio Emerenciano Neto ,Éric George Morais ,Ermelinda Maria Mota Oliveira ,Márcio Gleybson Da Silva Bezerra ,Gualter Guenther Costa Da Silva ,Gelson Dos Santos Difante

doi:10.1590/1807-1929/agriambi.v23n8p579-585

Abstract

ABSTRACT There is a worldwide concern regarding the management of agroindustrial residues, involving sustainable practices that contribute to taking advantage of the residues as inputs in productive processes, allowing greater efficiency in the integration of agricultural activities and mitigating their adverse effects on the soil. Therefore, the objective of this study was to assess the effects of application of cassava wastewater on the chemical attributes of the soil cultivated with Brachiaria brizantha cv. Marandu. The experimental design was in randomized blocks with five treatments (0, 15, 30, 60 and 120 m³ ha-1 of cassava wastewater) and four repetitions. To characterize soil chemical attributes soil samples were collected at depths 0 to 10 and 10 to 20 cm, for determination of the concentrations of soil organic matter, available phosphorus, exchangeable potassium, sodium, calcium and magnesium before and after cassava wastewater application were determined. The application of cassava wastewater increases available phosphorus and exchangeable potassium concentrations, decreases exchangeable calcium, magnesium and organic matter contents of the soil cultivated with Marandu grass. Cassava wastewater can be used as organic fertilizer for pastures of Marandu grass with doses of up to 120 m³ ha-1.

Highlights

The proper management of the agroindustry residues in rural properties allows greater efficiency in the integration of agricultural activities
To characterize soil chemical attributes soil samples were collected at depths 0 to 10 and 10 to 20 cm, for determination of the concentrations of soil organic matter, available phosphorus, exchangeable potassium, sodium, calcium and magnesium before and after cassava wastewater application were determined
The application of cassava wastewater increases available phosphorus and exchangeable potassium concentrations, decreases exchangeable calcium, magnesium and organic matter contents of the soil cultivated with Marandu grass

Summary

Introduction

The proper management of the agroindustry residues in rural properties allows greater efficiency in the integration of agricultural activities. ‘Manipueira’ is the main residue from the processing of cassava, whose appearance is a milky liquid with a high concentration of potassium, nitrogen, phosphorus, calcium, magnesium and sulfur, as well as iron and other micronutrients (Marini & Marinho, 2011). This residue has the potential to be used as an organic fertilizer (Duarte et al, 2013), which allows high agricultural productivity in low fertility soils. For the production of flour, the roots are less processed, especially when compared to processing to obtain the starch or gum, the concentrations of nutrients present in the ‘manipueira’ from the processing of cassava for the production of flour will be higher

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Conclusion