Studies on the fate of isoproturon applied to control Dumbi sitti (Phalaris minor) in wheat (Triticum aestivum)
2001
Naseem, S.
In the present study, winter wheat variety Inqilab was seed farm and was sown in a plot size of 0.404 hac. Sowing on flat plot was by tractor drilling 6 inches apart using a seed rate of 125 kg/ha. Arelon (45% Isoproturon) at a dose of 3.7 L/ha to control Phalaris minor (Dubmi sitti) was sprayed in three parts of the plot leaving one part as untreated after 28-30 days of sowing. The premature sample of whole- wheat plant after 3 months wheat straw and soil samples from seated plots were analyzed for Isoproturon residues qualitatively and quantitatively by thin layer chromatography and spectrophotometric methods. The residues of Isoproturon remained undetected in whole-wheat plant, wheat straw of controlled plot while ill soil of control plot, it was detected by both the methods. The amount of Isoproturon residues decreased successively from whole-wheat plant to wheat straw and wheat grains, but it increased successively in soil of treated plot upto the level of (Phalaris minor) control rating of Arelon (Isoproturon) applied on wheat crop was also measured and it was upto 98% effective and increase in grain yield of treated plot was also determined and on average it increased from 160 to 370 kg/plot of size 3509.68 sq meter i.e. 1 acre/4. It has been concluded that the recommended dose of manufacturer and amended dose reported in the present study have not been successful to completely control the weed Phalaris minor (Dumbi sitti) in the wheat field. The residue studies indicated that the residual level determined in wheat grains, straw exceeds permissible levels recommended by WHO but the chemical persisted in the soil samples.
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