Effect Of An Organic Residue On
Herbicide Field Dissipation
Author(s)
A. Cabrera, L. Cox, P. Velarde & J. Cornejo
Abstract
The aim of this work was to study the effect of the application of a solid waste
from olive oil production (alperujo) on the movement and persistence of the
herbicide diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea]. The application of
alperujo, fresh or composted, to the land has been shown to be an extremely
effective contribution to increasing crop yields and to maintaining or improving
soil fertility. An experimental olive grove located in Mengibar (Jaen, Spain) was
divided into two plots: 1. Plot without organic amendment (blank) and 2. Plot
treated with alperujo during 3 years at a rate of 17920 kg of alperujo ha-1. Diuron
was applied to both plots at a rate of 2 kg ha-1a.i. Triplicates from each plot were
sampled at three depths (0-10, 10-20 and 20-30 cm), air-dried, remains of olive
leaves, grass roots, and stones removed and sieved through a 5 mm mesh sieve.
Diuron was extracted with methanol 1:2 weight:volume ratio, the extracts were
evaporated to dryness, resuspended in 2 mL of methanol, filtered and analyzed
by HPLC. Higher amounts of diuron were detected at each sampling depth in
plots treated with alperujo. The increase in soil organic matter content upon
amendment with alperujo slightly increased sorption, suggesting that other
factors beside sorption affect diuron degradation rate in organic amended soils.
Keywords: olive oil production waste, diuron, soil, dissipation, field study.
1 Introduction
Soil amendment with olive oil mill wastes increases soil organic matter affecting
soil physico-chemical and biological environments and, consequently, affecting
immobilization and degradation of herbicides. The increase in soil organic
matter can increase sorption potential and reduce pesticide contamination of
ground water [1, 2]. Under controlled laboratory conditions, an increase in
Keywords
olive oil production waste, diuron, soil, dissipation, field study.
Related Book
Other papers in this volume
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