DETERMINATION OF THE HERBICIDE BASAGRAN RESIDUES IN MAIZE PLANTS AND SOIL

The residual effect of bentazone (Basagran 48% WP) alone and in mixture with nitrogen , phosphor and potassium as fertilizers in Maize plants (Zea mays L. ) and its soil under environmental condition of Egypt was studied . The tested herbicide was sprayed at recommended dose of 1.5 L/Fed on Maize plants . QuEChERA (catchers) method was used for extraction and clean – up of the samples . The treated Maize plants and soil were randomly sampled after 1,3,7,11,15 and 20 days after herbicide and mixture application . Samples were extracted , clean up and analyzed using Gas chromatography . The recovery percentages were 75 % and 90 % in soils and leaves , respectively .The results revealed that the residues concentrations were 7.5 , 2.54 .0.33 , 3.47 ; 4.62 , 4.13 , 4.73 and 4.40 mg / kg in leaves of Maize plants and soil after 24h. in Basagran, Basagran + N, Basagran + P and Basagran+ K,respectively . The herbicide residues on leaves of Maize plants were 5.21 to 2.04 ; 1.33 to 0.69 ; 0.33 to 0.04 and 3.37 mg / kg to ND from 3 days to 20days in Basagran, Basagran + N, Basagran + P and Basagran+ K,respectively. The corresponding residues on soil were 3.67 to ND; 4.13 to ND; 4.73 to ND and 4.40 to ND mg / kg from 3 days to 20 days in Basagran,Basagran + N, Basagran + P and Basagran+ K ,respectively
The corresponding half - life values were 10.8 , 13.1 , 6,9 and 2.66days in Basagran, Basagran + N, Basagran + P and Basagran+ K,respectively in leaves of Maize plants and 3.5, 3.4 , 3.0 , 2,5 days in soil samples. The residues on Maize plants were below the maximum residual level (MRL) value reported by the European Food Safety Authority (EFSA ,2013) of the herbicide and it was 0.2 mg/Kg.