Residual Effect of Folimat 800 (Organophosphate) and Icaros Pesticides on Soil Fertility and Carrot Growth

Abstract

An experiment was carried out at Shambat Agricultural Farm (North), College of Agricultural Studies, Sudan University of Science and Technology, 4 December 2014 one season to study the effect of Folimat and Icaros pesticides residues on soil and carrot growth. Both pesticides were added at concentrations of 1.92 Kg/ha (recommended dose) and 2.88 Kg/ha (excessive dose) for folimat , but for Icaros 249.2 ml/ha (recommended dose) and 371.8 ml/ha (excessive dose) in addition to a control to evaluate their effect on plant and soil. Measurements taken are plant height/plant, leaf area, and fresh and dry weight. pH, total nitrogen( %),phosphorus( ppm ), organic carbon (%), soluble cations (Meq/L) :〖Ca〗^(++),〖Mg〗^(++ ),〖Na〗^+ ,K^+, soluble anions (Meq/L): 〖CO〗_3, 〖HCO〗_(3 ),Cl,〖CaCO〗_3 ,soil particle size analysis (%)and CEC (Meq/100g soil) and electrical conductivity of the saturation extract 〖EC〗_edS/m. The two pesticides applied one month after plants. The results revealed that, both chemicals affected positively carrot vegetative growth at the recommended dose , but negatively at the excessive dose. Both pesticides reduced the measured soil characteristic. The effect of pesticides on soil microorganism was used by serial dilution method and clearly observed at the recommended dose and at the excessive dose . Key Words: Icaros, Folimat, Pesticides, Residues.