Komunitas Nematoda pada Lahan Pertanaman Wortel dan Hubungannya Dengan Populasi Mikrob Tanah

Abstract

Nematodes are yield-reducing pests for most agronomic crops including carrots (Daucus carota). Information on the diversity and population density of nematodes in carrot fields by distinguishing between nematode communities in carrot fields with healthy plants and those with symptoms of disease has not been widely reported. This study aims to identify soil nematode communities and see their correlation with soil microbial populations. Soil samples were taken from four carrot plantations where the plants were healthy and had symptoms of disease. Soil nematode extraction was carried out using the floatation-centrifugation method and the soil microbial population was observed using the plate-count method. Identification of nematodes was carried out to the genus level by looking at their morphological characteristics. The results showed that there were 30 genera of nematodes derived from soil samples in four carrot fields, which were dominated by the herbivorous nematode genus. The five nematode genera with the largest populations are Pratylenchus, Meloidogyne, Acrobeloides, Helicotylenchus, and Rotylenchulus. The abundance of nematodes per trophic group at each location was significantly different (P <0.05), but not significantly different between plant conditions. Based on the Shannon-Wiener Diversity Index, the diversity of nematodes in the four carrot plantations was in the moderate category (1 < H' < 3). Bacterial and fungal populations at four locations and two plant conditions were not significantly different (P >0.05). Soil nematode community had a weak correlation with soil microbial population (correlation value <0.5). Populations of nematodes that eat bacteria and fungi are negatively correlated with populations of bacteria and fungi. The population of nematode and soil microbial in this study were more influenced by the land management.