Effect of shallot extract concentration as a natural plant growth regulator on the growth of lime (Citrus aurantifolia) cuttings
Abstract
Lime production in Manggarai Regency still faces various challenges, such as suboptimal cultivation technology, pest and disease infestations, and a lack of farmer awareness regarding the use of natural plant growth regulators (PGRs)—specifically those derived from shallot extract—which warrants further attention. This study aimed to determine the effect and optimal dosage of shallot extract, acting as a natural plant growth regulator, on the growth of lime (*Citrus aurantifolia*) cuttings. The research was conducted in Langke Rembong, Manggarai Regency, East Nusa Tenggara, from April to June 2025. A single-factor Completely Randomized Design (CRD) was employed, featuring five concentration levels of shallot extract: P0 (control), P1 (25%), P2 (50%), P3 (75%), and P4 (100%), with five replications for each treatment. The parameters observed included shoot height, number of shoots, and number of leaves. The results indicate that the application of shallot extract as a plant growth regulator has a significant effect on all growth parameters. The 75% treatment (P3) yielded the best results among the concentrations tested, with a shoot height of 9.16 cm, 11.80 shoots, and 42.30 leaves. These findings suggest that a 75% concentration of shallot extract (750 ml of extract mixed with 250 ml of water) is effective in stimulating the vegetative growth of lime cuttings.
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