Soil nematode community structure reaction to organic amendments in shallot

Nematode abundance and diversity could indicate soil health since they play roles in the soil nutrient cycle. In a shallot field, nematode abundance and diversity from different types of organic manure treatment were examined to determine the effect of organic fertilizer on nematode abundance. This study aimed to determine the best option of organic amendment for managing the nematode population in crop soil. The research took place in the center of a shallot plantation in Kulon Progo District, Yogyakarta, Indonesia, and consisted of four treatments: cow manure+green manure; sludge+green manure; cow manure, and chicken manure as farmer control. The nematode community was processed and analised with the PCA, which indicated a cumulative value of 94.5. The treatment of cow and green manure contributed in nematode abundance, in which nematodes clustered were predators, bacterial feeders, and omnivores. The treatment of cow and green manure could be the best option that environmentally friendly control plant-parasitic nematodes and improve beneficial nematodes abundance that could improve the soil health by their regulation in soil.