Wastewater from swine farming in the growth and nutrition of Khaya senegalensis (DESR.) A Juss seedlings

Emanuel França Araújo,Julian Júnio de Jesus Lacerda,Dayara Lins Porto,Luis Ricardo Romero Arauco,Cácio Luiz Boechat,Adriana Miranda de Santana Arauco,Bruna Anair Souto Dias

doi:10.14393/bj-v35n5a2019-42276

Emanuel França Araújo, Julian Júnio de Jesus Lacerda + Show 5 more

Open Access

https://doi.org/10.14393/bj-v35n5a2019-42276

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Abstract

This study evaluated the use of wastewater from swine farming in the growth and nutritional balance of Khaya senegalensis (Desr.) A. Juss. (African mahogany) seedlings. The experiment was setup in a shade house on the Professor Cinobelina Elvas Campus of the Federal University of Piauí, in Bom Jesus, in the State of Piauí, Brazil. The experimental design was completely randomised, with five concentrations of swine farm wastewater (SFW) (0, 25, 50, 75 and 100%) added to the irrigation water. The growth and nutritional balance of the seedlings were evaluated 100 days after sowing, by measuring shoot height (H), stem diameter (SD), number of leaves (NL), total chlorophyll (TC), leaf area (LA), shoot dry weight (SDW) and root dry weight (RDW), and by calculating the total dry weight (TDW), leaf (LBA), stem (SBA), and root (RBA) biomass allocation, Dickson Quality Index (DQI) and average Nutritional Balance Index (NBIm). It was found that K. senegalensis seedlings responded to the SFW, showing the best results for growth and nutritional balance at concentrations of around 50%.

Highlights

Global production of waste from swine farms is growing together with global demand for food and protein from animals
At the end of the experiment, a trend was observed, for the increase in N, P and K concentrations in the substrate as the concentrations of swine farm wastewater (SFW) increased, and in electrical conductivity, with an increase of around five times when compared to the treatment with no wastewater and the treatment with 100% wastewater for the irrigation of the African mahogany (Khaya senegalensis) seedlings (Table 2)
These responses to the treatments in the chemical quality of the substrate can be explained by the greater contribution of nutrients from the increasing SFW concentrations, and by the high electrical conductivity (EC) of the wastewater (Table 2)

Summary

INTRODUCTION

Global production of waste (liquid and solid waste) from swine farms is growing together with global demand for food and protein from animals. Wastewater is capable of providing improvements in soil physical, chemical and biological properties, providing nutrients for crop and still bringing to the producer productivity increase and cost reduction (SCHERER et al, 2007). An ecofriendly alternative to wastewater is its use as nutrient source in vegetation fertilization, enhancing soil chemical attributes and promoting nutrient cycling. This practice allows the farmer to minimize the costs with conventional fertilizers and provides an alternative to the raw discharge of residues generated from extensive poultry, beef and pork production, allowing soil and plants to be used as filters (CABRAL et al, 2014; PEgoraro et al, 2014; ROSA et al, 2017a). This study evaluated growth and nutrition of Khaya senegalensis subjected to dilutions of swine wastewater and freshwater

MATERIAL AND METHODS

RESULTS AND DISCUSSION

CONCLUSIONS