RESPON CACING TANAH (Lumbricus rubellus L, Hoffmeister 1843) PADA PERLAKUAN ABU DAUN JARAK (Ricinus Communis L.)

LESTARI, TSABITAH PUTRI DWI and Marisa, Hanifa (2025) RESPON CACING TANAH (Lumbricus rubellus L, Hoffmeister 1843) PADA PERLAKUAN ABU DAUN JARAK (Ricinus Communis L.). Undergraduate thesis, Sriwijaya University.

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Abstract

Earthworms (Lumbricus rubellus L.) are soil organisms that play an essential role in maintaining soil fertility and can be used as bioindicators of soil quality. This study aims to determine the response of earthworms to the treatment of castor (Ricinus communis L.) leaf ash, which contains chemical compounds such as potassium hydroxide (KOH) that may affect their behavior, morphology, and mortality rate. The study employed a Completely Randomized Design (CRD) with four treatment levels: 0 % (control), 5 %, 10 %, and 15 % castor leaf ash mixed into the soil. The observed parameters included changes in behavior (movement, response to stimuli), mortality rate, and morphological alterations in earthworms after 1 and 24 hours of treatment. The results indicated that castor leaf ash affected earthworm behavior, particularly at the highest concentration (15 %), leading to increased writhing, coiling, and even convulsions due to nervous system disruption. Earthworm mortality increased with higher ash concentrations, with the highest death rate reaching 93 % in the 15 % treatment after 24 hours. Additionally, observed morphological changes included body shrinkage of up to 50 % due to dehydration caused by the irritating effects of castor leaf ash on the earthworms' respiratory system and integument. These findings suggest that castor leaf ash exhibits toxic effects on earthworms, potentially disrupting soil ecosystem balance. Therefore, further studies are needed to assess the feasibility of using castor leaf ash as a soil ameliorant and its impact on other soil organisms and ecosystem stability

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Keywords: Lumbricus rubellus L, castor leaf ash, behavior, mortality
Subjects:	Q Science > QR Microbiology > QR171 Microorganisms in the animal body
Divisions:	08-Faculty of Mathematics and Natural Science > 46201-Biology (S1)
Depositing User:	Tsabitah Putri Dwi Lestari
Date Deposited:	21 Mar 2025 02:21
Last Modified:	21 Mar 2025 02:21
URI:	http://repository.unsri.ac.id/id/eprint/169659

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