Net mineralization nitrogen and soil chemical changes with application of organic wastes with ‘Fermented Bokashi Compost’

Cácio Luiz Boechat,Adriana Maria De Aguiar Accioly,Jorge Antonio Gonzaga Santos

doi:10.4025/actasciagron.v35i2.15133

Abstract

The use of organic wastes in agricultural soils is one of the possible ways to employ these materials. The aims of this study were to evaluate the effectiveness of organic wastes and Fermented Bokashi Compost (FBC), to establish the most efficient use of organic wastes for a soil, changing the net nitrogen mineralization and soil chemical properties. The experimental design was completely randomized in a 6 x 2 x 5 factorial, being five organic wastes plus an control (soil without waste), with or without FBC, evaluated at 0, 7, 42, 70 and 91 days of incubation, with three replicates, under laboratory conditions. The organic wastes enhanced the soil chemical properties and increased nitrogen concentration in soil. However, the net nitrogen mineralization was affected by C/N ratio of wastes and incubation time. The FBC mixed with the wastes accelerated and enhanced organic matter degradation, resulting in quickly available quantity of net nitrogen. The wastes can be considered potentially useful as organic fertilizer but their usefulness appears to depend on knowing the C/N ratio of each one. The FBC can be used when one wants a more accelerated degradation, resulting in a quicker quantity of available nutrients to the plants.

Highlights

The use of organic wastes from production processes or in biofertilizer form as a source of plant nutrients in agricultural soils is one of the ways to employ these materials, as they increase fertility, and improve soil characteristics and physic-chemical properties, and microbial activity (BRADY; WEIL, 2002).One of the world’s most commonly used biofertilizers in this context is the so-called ‘EffectiveActa Scientiarum
Comparison of means showed that chemical attributes of the soil were affected by organic waste treatments compared to control (Table 3)
The soil chemical characterization initially showed that soil presented a higher acid pH and lower P, K, Ca, Mg, Al and organic matter concentrations (TOMÉ JÚNIOR, 1997)

Summary

Introduction

The use of organic wastes from production processes or in biofertilizer form as a source of plant nutrients in agricultural soils is one of the ways to employ these materials, as they increase fertility, and improve soil characteristics and physic-chemical properties, and microbial activity (BRADY; WEIL, 2002).One of the world’s most commonly used biofertilizers in this context is the so-called ‘EffectiveActa Scientiarum. The use of organic wastes from production processes or in biofertilizer form as a source of plant nutrients in agricultural soils is one of the ways to employ these materials, as they increase fertility, and improve soil characteristics and physic-chemical properties, and microbial activity (BRADY; WEIL, 2002). Agronomy microorganisms’ (EM), referring to an undisclosed mixture of naturally occurring microorganisms that supposedly has beneficial properties in a wide range of applications (HIGA, 2002). Bokashi is the Japanese term for ‘fermented’ organic matter and is equivalent to compost used in traditional organic farming which is mostly prepared with the addition of EM. The Fermented Bokashi Compost is a mixture of several types of organic matter subjected to predominantly lactic fermentation.

Objectives

Methods

Results