Author:
Henry Michelle Crystal,Ngaini Zainab,Chai Lian-Kuet,Farooq Saba
Abstract
AbstractThis study was conducted to contour dissipation patterns of two pesticides (profenofos and λ-cyhalothrin) on B. juncea (green mustard) grown under green house (G.H.) and open field (O.F.) during dry and wet season. The dissipation data of studied pesticides were fitted into the first order kinetic equation. Based on the dissipation rate constant, k obtained, profenofos dissipates faster than λ-cyhalothrin regardless of growing system and season. The dissipation of both pesticides were found to be more rapid during dry season compare to wet season. Growing system however displayed a rather contradictory results for profenofos where during dry season, faster dissipation took place in O.F., while during wet season rapid dissipation took place in G.H. λ-Cyhalothrin on the other hand exhibits faster dissipation in G.H. during both seasons. The half-lives obtained for profenofos and λ-cyhalothrin in B. juncea were 0.66–1.8 days and 1.18–3.7 days, respectively. Based on this experiment, terminal residue obtained for profenofos and λ-cyhalothrin for B. juncea were lower than the stipulated MRL. This work was momentous to guide appropriate applications and establishment of accurate PHI of pesticides in B. juncea that will benefit farmers in a country with humid tropical climate.
Funder
Ministry of Higher Education Malaysia, fundamental research grant scheme
Universiti Malaysia Sarawak
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,General Physics and Astronomy,General Engineering,General Environmental Science,General Materials Science,General Chemical Engineering