Effects of repeated application on persistence and downward movement of four herbicides in soil

Ismail Sahid, K. Kalithasan

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The downward movement and persistence of picloram, terbuthylazine, alachlor, and pendimethalin were studied under tropical field conditions in loamy soil. Picloram and alachlor were applied separately at 0.5 and 2.0 kg a.i./ha, respectively, while terbuthylazine and pendimethalin were each applied at 1.0 kg a.i./ha. Each herbicide was subjected to 2 experimental conditions: (i) the required amount of herbicide applied 2 times, and (ii) the required amount applied 6 times. The presence of these herbicides in soil was assessed by bioassay techniques. Rice seed (Oryza sativa) and long bean (Vigna sinensis) were used to assay pendimethalin and picloram, respectively, while cucumber (Cucumis sativus) was used for both alachlor and terbutbylazine. The results showed that both alachlor and picloram moved downward faster than terbuthylazine and pendimethalin. Both alachlor and picloram, but not terbuthylazine or pendimethalin, could be detected in 5-10 cm layer at 1 day after application (DAA). The phytotoxic residues of picloram, pendimethalin, terbuthylazine, and alachlor were detected in the 0-5 cm layer until 84, 56, 49, and 35 DAA (2 applications), respectively. However, after 6 applications, the phytotoxic residue of these herbicides in the top layer was reduced. Our results show that pendimethalin was less mobile than the other herbicides. The half-lives of picloram, pendimethalin, terbuthylazine, and alachlor were 9.7, 6.4, 6.0, and 4.4 days, respectively, after 2 applications, but after 6 applications, the half-lives of these herbicides were shorter.

Original languageEnglish
Pages (from-to)503-513
Number of pages11
JournalAustralian Journal of Soil Research
Volume35
Issue number3
Publication statusPublished - 1997

Fingerprint

pendimethalin
alachlor
picloram
terbuthylazine
herbicide
persistence
herbicides
soil
half life
Vigna unguiculata subsp. unguiculata
herbicide residues
effect
loam soils
Cucumis sativus
cucumbers
bioassay
Oryza sativa
beans
rice
bioassays

Keywords

  • alachlor
  • degradat ion
  • half-life
  • pendimethalin
  • persistence
  • picloram
  • terbuthylazine

ASJC Scopus subject areas

  • Soil Science
  • Earth-Surface Processes
  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Effects of repeated application on persistence and downward movement of four herbicides in soil. / Sahid, Ismail; Kalithasan, K.

In: Australian Journal of Soil Research, Vol. 35, No. 3, 1997, p. 503-513.

Research output: Contribution to journalArticle

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abstract = "The downward movement and persistence of picloram, terbuthylazine, alachlor, and pendimethalin were studied under tropical field conditions in loamy soil. Picloram and alachlor were applied separately at 0.5 and 2.0 kg a.i./ha, respectively, while terbuthylazine and pendimethalin were each applied at 1.0 kg a.i./ha. Each herbicide was subjected to 2 experimental conditions: (i) the required amount of herbicide applied 2 times, and (ii) the required amount applied 6 times. The presence of these herbicides in soil was assessed by bioassay techniques. Rice seed (Oryza sativa) and long bean (Vigna sinensis) were used to assay pendimethalin and picloram, respectively, while cucumber (Cucumis sativus) was used for both alachlor and terbutbylazine. The results showed that both alachlor and picloram moved downward faster than terbuthylazine and pendimethalin. Both alachlor and picloram, but not terbuthylazine or pendimethalin, could be detected in 5-10 cm layer at 1 day after application (DAA). The phytotoxic residues of picloram, pendimethalin, terbuthylazine, and alachlor were detected in the 0-5 cm layer until 84, 56, 49, and 35 DAA (2 applications), respectively. However, after 6 applications, the phytotoxic residue of these herbicides in the top layer was reduced. Our results show that pendimethalin was less mobile than the other herbicides. The half-lives of picloram, pendimethalin, terbuthylazine, and alachlor were 9.7, 6.4, 6.0, and 4.4 days, respectively, after 2 applications, but after 6 applications, the half-lives of these herbicides were shorter.",
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