This study was conducted to find out the effect of rearing earthworms O. cyanieum in soil treated with concentrations (100, 250, 500 and 1000 mg / kg) for a period of (7, 14, 21 and 28 days) of rearing, as urea fertilizer had a significant effect on all activities The vital activity measured in the experiment, all worms died at a concentration of 1000 mg/kg after 7 days. There was also a decrease in weight, reaching the highest drop of 0.475 g, and the relative growth rate was 64.62% at a concentration of 500 mg/kg after 28 days. Also, the amount of protein content in the body of worms decreased with increasing concentrations.
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Hassan et al. (2024) studied this question.
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