CD Tesis
Residu pestisida pada gabah padi (oryza sativa l.) Dan tanah serta pengaruhnya terhadap mesofauna tanah di kabupaten siak
The use of chemical pesticides in controlling rice plant pests has the potential to leave residues on rice plants and also agricultural land. The information on types and levels of pesticide residues that are dominantly used by farmers can be a reference in the wise application of pesticides. The purpose of this study was to identify the use of pesticides and the application of integrated pest control (IPM) by farmers, to determine the residual levels of lambda-cyhalothrin and carbofuran in grain and soil and their correlation to soil mesofauna diversity in 4 sub-districts of rice centers in Siak Regency. The research was conducted from January to October 2019. Sampling was conducted in Bunga Raya Sub-District, Sabak Auh, Sungai Apit, and Sungai Mandau. Sample examination was carried out at the Pesticide Residue Testing Laboratory, Plant Product Quality Testing Center, Ministry of Agriculture, Jakarta, and Soil Laboratory of the Faculty of Agriculture, Riau University, Pekanbaru. The study used a survey method with a questionnaire and data collection followed by an examination of samples in the laboratory. The results of the analysis of insecticide residues that were detected were lambda-cyhalothrin in Bunga Raya District on D1 sampling land (grain 0.007 ppb and soil 0.002 ppb) and D3 (grain 0.001 ppb and soil 0.008 ppb), Sabak Auh District on D1 sampling land (grain 0.063 ppb and soil 0.009 ppb) and Sungai Apit District on D3 sampling area (soil 0.007 ppb). The identified mesofauna consisted of 3 classes (Arachnida, Entognatha, and Insecta), 8 orders (Acarina, Collembola, Diplura, Coleoptera, Diptera, Hymenoptera, Psocoptera, Thysanoptera), and 30 families. There was no significant difference in mesofauna abundance between sampling areas and the highest abundance was found in Sungai Mandau D3 District (0.1312.10-4 ind.m-2) and the lowest abundance was in Sabak Auh D1 District (0.0288.10-4 ind.m-2) namely the sampling area detected residue of lambda-cyhalothrin. The Shannon Mesofauna Diversity Index is in the medium category, (1,725– 2,350). There is a negative correlation between lambda-cyhalothrin residue in grain and the Shannon Diversity Index of mesofauna.
Keywords: pesticide residue, lambda cyhalothrin, carbofuran, soil mesofauna
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