Mohamed Osman Gafar1 , Abdalbasit Adam Mariod2 *, Abdelgadir Osman3 , Yassin Mohamed Ibrahim Dagash4 and Hatim Guma1
This study was conducted at College of Agricultural studies, Sudan university of Science and Technology Farm to evaluate the residual effect of the recommended dose of Malathion, an organophosphate insecticide, and Sevin, a carbamate insecticide on the dry weight and length of radish. The results showed that, the recommended dose of Sevin has positively affected both variables; the average length and weight of the treated plants were 5.2 cm and 13.2g higher than their counterpart values of the control, respectively. However, when an over dose was administered it negatively affected both variables; the average length and weight of the treated plants were decreased by 6.6 cm and 26.9 g, respectively. On the other hand, the recommended dose of Malathion adversely affected the weight and length of radish. The average lengths of the treated plants were decreased by 6.6 cm and 26.9 g, respectively. Similary, the recommended dose of Malathion adversely affected the weight and length of radish. The average length of the treated plants was 11.7 cm shorter than that; of control where as the average weight was 7.9 g lighter than the control. Compared with control, the average length and the weight of the treated plants were reduced by 20 cm and 17.2g, respectively. Being a key component of the chemical structure of Sevin as well as a crucial element in soil fertility, the nitrogen seemed to have played a major role in the favorable results obtained the by recommended dose of Sevin or opposed to those of Malathion.
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