Phytotoxicity and persistence of metribuzin residues in black soil

Bull Environ Contam Toxicol

Singhai

2008

Self Cite

Presence of herbicides residue in the soil not only damages the succeeding sensitive crops but also adversely affect human and animal health due to bioaccumulation of residues in crop produce. Thus an experiment was conducted to evaluate persistence of sulfosulfuron residues applied in wheat crop as post-emergence at 25, 50 and 100 g ai ha(-1) application rates to control weeds. Residues were evaluated in surface and subsurface soil by HPLC using Photo diode array detector. Sulfosulfuron residues were dissipated rapidly in surface and subsurface soil at initial period. After150 days residues were found below 0.001 microg/g in soil samples collected from 25 to 50 g ha(-1) treated plots. However, at 100 g ha(-1) dose residues were not detected after 200 days in surface and subsurface soil.

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Persistence of Sulfosulfuron Under Wheat Cropping System

Bull Environ Contam Toxicol

Singhai

2008

Self Cite

“…Tsiropoulos and Miliadis (1998) reported 0.054 ppm residues in onions treated at 2.0 kg ha −1 . Low concentration of the oxyfluorfen in soil is compensated due to high organic matter content, which in turn increased microbial activity and increased the rate of degradation (Jenkinson and Ladd 1981;Shelton and Parkin 1991;Johnson and Sims 1993;Sondhia 2005;Sondhia 2008). Besides the organic matter, clay content can also play an important role in degradation rate of pesticides.…”

Section: Residues Of Oxyfluorfen In Soil and Green And Mature Onionmentioning

confidence: 97%

Persistence and bioaccumulation of oxyfluorfen residues in onion

2009

Environ Monit Assess

Self Cite

A field study was conducted to determine persistence and bioaccumulation of oxyflorfen residues in onion crop at two growth stages. Oxyfluorfen (23.5% EC) was sprayed at 250 and 500 g ai/ha on the crop (variety, N53). Mature onion and soil samples were collected at harvest. Green onion were collected at 55 days from each treated and control plot and analyzed for oxyfluorfen residues by a validated high-performance liquid chromatography method with an accepted recovery of 78-92% at the minimum detectable concentration of 0.003 microg g(-1). Analysis showed 0.015 and 0.005 microg g(-1) residues of oxyfluorfen at 250 g a.i. ha(-1) rate in green and mature onion samples, respectively; however, at 500 g a.i.ha(-1) rates, 0.025 and 0.011 microg g(-1) of oxyfluorfen residues were detected in green and mature onion samples, respectively. Soil samples collected at harvest showed 0.003 and 0.003 microg g(-1) of oxyfluorfen residues at the doses 250 and 500 g a.i. ha(-1), respectively. From the study, a pre-harvest interval of 118 days for onion crop after the herbicide application is suggested.

“…In the soil the decrease in the concentration of the pesticide in soil is compensated by the increased microbial activity, thereby increasing the rate of degradation (Bolan and Baskaran 1996;Kanazawa et al 1988;Johnson and Sims 1993;Shelton and Parkin 1991;Sondhia 2005). Besides the organic matter, the clay content can also play an important role in degradation rate of pesticides.…”

Section: Residues In the Rice Grains And Strawmentioning

confidence: 98%

Determination of imazosulfuron persistence in rice crop and soil

2007

Environ Monit Assess

Self Cite

Imazosulfuron is a new post-emergence sulfonylurea herbicide. It is highly active at low application rates to control annual and perennial broad-leaf weeds and sedges in rice. There is increasing concerned about the persistence of pesticide residues in soils, crop produce and subsequent contamination of groundwater. Thus persistence of imazosulfuron residues under field condition was evaluated. Imazosulfuron was applied at 30, 40, 50 and 60 a. i. g ha (-1) rates, 4 days after transplanting of rice as post-emergence herbicide. Soil and plant samples treated with imazosulfuron were collected at 60, 90 and 120 days after herbicide application and analyzed for residues. Rice grains and straw samples were sampled at harvest (120 days). Residues of imazosulfuron in soil were not found after 90 and 120 DAS (days after spraying). Rice grains contained 0.006, 0.009 microg g(-1) residues at 50 and 60 g ha (-1) application rates. 0.009 and 0.039 microg g(-1) residues of imazosulfuron were detected at 50 and 60 g/ha rates respectively in rice straw. Residues of imazosulfuron were not detected applied at 30 and 40 g ha(-1) in rice grains and straw, respectively and can be safely applied to the transplanted rice.