Identification of Insecticide Residues in Inceptisols at The Central of Horticultural Production, Banuhampu Agam West Sumatra

The high persistence of insecticides in soil and their toxicity to farmers and agricultural land are serious problems with insecticide application. This study was to identify and characterize insecticide residues on Inceptisol in the center of horticultural production, Banuhampu Agam West Sumatra. The determination of soil samples was carried out by purposive random sampling with a quantitative survey method. Sample testing using randomized completely block design (RCBD) with four slope levels and three points of sampling : 0-8%; 8-15%; 15-25%, and 25-45% in fields at a depth of 0-20 cm and forests (25-45% slope) as control. Insecticide residues on Inceptisol in the central of horticultural production, Banuhampu Agam West Sumatra, identified as many as 5 types, namely: Cypermethrin [C 22 H 19 Cl 2 NO 3 ]; Permethrin [C 21 H 20 Cl 2 O 3 ]; Profenofos [C 11 H 15 BrClO 3 PS]; Phenthoate [C 12 H 17 O 4 PS 2 ], and Diazinon [C 12 H 21 N 2 O 3 PS]. Cypermethrin was the most highly contaminated insecticide residue found in soil at 0.1 mg kg −1 and is a pyrethroid insecticide. The effect of slope level was not significant on the identification of the number of active ingredients and total insecticide residue concentration. However, the highest number of active ingredients on 0-8% and 25-45% slope each amounted to 3 units, while the highest total concentration of insecticide residues on 0-8% slope amounted to 0.499 mg kg −1 .