Abstract
ABSTRACT This study aimed to evaluate the use of wastewater from the cassava processing as organic fertilizer on pastures of Brachiaria brizantha cv. ‘Marandu’. The treatments were wastewater doses (0, 15, 30, 60 and 120 m3 ha-1), in a randomized block design with four replicates. The structural characteristics and morphological composition of the pastures were evaluated, from July 2013 to January 2014. The addition of wastewater promoted a positive linear increase in the three cuts for the canopy height, light interception and leaf area index. The maximum dry matter (DM) production was obtained with 120 m3 ha-1 of wastewater (2796 kg ha-1 of DM in the second cut). The mass of senescent material in the second and third cuts fitted to positive linear equation. The increase in wastewater doses promoted the reduction of undesirable plants. The recommended dose of residual water in pastures of ‘Marandu’ grass is 120 m3 ha-1, which promotes a higher mass of forage and lower of undesirable plants.
Highlights
Brazil stands out as the second largest cassava producer in the world; most of this production is used in the cassava processing to obtain starch and flour (FAO, 2010), which generates large production of waste of the starch factories
This study aimed to evaluate the use of cassava wastewater as organic fertilizer in pastures of Brachiaria brizantha cv
The interaction between cassava wastewater doses and cuts was significant for all variables (p < 0.05), except for the mass of undesirable plants (p < 0.05)
Summary
Brazil stands out as the second largest cassava producer in the world; most of this production is used in the cassava processing to obtain starch and flour (FAO, 2010), which generates large production of waste of the starch factories (cassava wastewater) The disposal of this waste directly in the soil and water courses causes serious environmental impacts on the water and soil resources. Compared with other organic wastes, cassava wastewater has higher contents of the main essential elements (N, P and K) required by plants (Magalhães et al, 2016) This characteristic allows the utilization of this waste as organic fertilizer considering the soil chemical composition and the doses tolerated by crops (Duarte et al, 2012). The authors observed that cassava wastewater allowed increase in the biomass of the agricultural crops
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