Pakcoy (Brassica rapa subsp. chinensis) is a leafy vegetable widely consumed by the community and requires adequate nutrient availability to support optimal seedling growth. The utilization of organic waste as liquid organic fertilizer (LOF) represents an environmentally friendly alternative while contributing to agricultural waste management. Onion peel waste contains essential nutrients and organic compounds that have the potential to be utilized as raw material for LOF production. However, information regarding the effectiveness of onion peel-based LOF on pakcoy seedling growth remains limited, particularly across different application concentrations during the seedling stage. This study aimed to evaluate the effect of onion peel LOF on pakcoy seedling growth based on plant height, leaf number, and leaf color parameters. The experiment employed a Completely Randomized Design (CRD) consisting of four treatments: control, 20% LOF, 30% LOF, and 40% LOF. Data were analyzed using Analysis of Variance (ANOVA) at a 5% significance level. The results indicated that the 30% LOF treatment produced the highest average plant height and leaf number compared with the other treatments. However, statistical analysis revealed no significant effects on plant height, leaf number, or leaf color (p>0.05). Nutrient analysis showed that the onion peel LOF contained 0.03% nitrogen, 0.02% phosphorus, and 0.58% potassium, with potassium being the dominant nutrient. These findings imply that onion peel waste has potential as an additional nutrient source and biostimulant for sustainable crop cultivation. The results indicate that onion peel liquid organic fertilizer has the potential to be used as a supplementary fertilizer; however, it has not been able to significantly improve pakcoy seedling growth at the tested concentrations..

Keywords: Brassica rapa subsp. chinensis, liquid organic fertilizer, pakcoy, seedling growth, shallot peel waste.

Afifah, R. N., Setyono, P., & Rachmawati, S. (2024). Utilization of WWTP Output into Liquid Organic Fertilizer on the Growth of Pak Choi (Brassica rapa L.). Journal of Ecological Engineering, 25(10), 76–90.https://doi.org/10.12911/22998993/191746

Al Ansori, I. A., Putra, G. M. D., & De Side, G. N. (2025). Analisis Regresi Berganda Yang Mempengaruhi Produksi Tanamanan Pakcoy (Brassica Rapa L.). J-AGENT (Journal of Agricultural Engineering and Technology), 3(3), 270-277.https://jurnal.unram.ac.id/index.php/agent/id/article/view/9013

Calambro, J. J., Garcia, L., & Linsangan, N. (2023, October). The Effects of Soil Nutrient NPK Indicator and Recommendation System for Brassica Rapa subsp. Chinensis or Taiwan Pechay Bokchoy. In TENCON 2023-2023 IEEE Region 10 Conference (TENCON) (pp. 464-468). IEEE.https://colab.ws/articles/10.1109/tencon58879.2023.10322387?utm_source=chatgpt.com

Ernis, G., Mala, D. S., Okta, A., Notriawan, D., & Fadila, M. A. (2023). Nutrition Levels of Liquid Organic Fertilizer from Onion Skin (Allium cepa. L) with EM-4 Bioactivator. Sains Natural: Journal of Biology and Chemistry, 13(2), 73-80. https://doi.org/10.31938/jsn.v13i2.468

Febriyanti, P. R., Masnang, A., & Karmanah, K. (2023). Efektivitas pemberian pupuk organik cair cangkang telur dan kulit bawang merah terhadap pertumbuhan tanaman tomat sayur (Lycopersicum esculentum Mill.). Jurnal Ilmiah Respati, 14(1), 107–121.https://doi.org/10.52643/jir.v14i1.3185

Harimurti, S. A., & Ratnasari, E. (2025). Pengaruh Pupuk Organik Cair Daun Lamtoro, Air Leri, dan Sabut Kelapa terhadap Pertumbuhan Kangkung (Ipomoea reptans Poir.). LenteraBio: Berkala Ilmiah Biologi, 14(1), 72-77. https://journal.unesa.ac.id/index.php/lenterabio/index

Luo, L., Zhang, Y., & Xu, G. (2020). How does nitrogen shape plant architecture?. Journal of experimental botany, 71(15), 4415-4427.doi:10.1093/jxb/eraa187

Mendrofa, S. J., & Lase, N. K. (2025). Pengaruh Pemberian Pupuk Organik Cair Terhadap Pertumbuhan Dan Hasil Tanaman Pakcoy. Jurnal Ilmu Pertanian dan Perikanan, 2(2), 249-254.https://doi.org/10.70134/penarik.v2i2.676

Mohamad, N. S., Kassim, F. A., Usaizan, N., Hamidon, A., & Safari, Z. S. (2022). Effects of organic fertilizer on growth performance and postharvest quality of pak choy (Brassica rapa subsp. chinensis L.). AgroTech-Food Science, Technology and Environment, 1(1), 43-50.https://doi.org/10.53797/agrotech.v1i1.6.2022

Mustofa, M. J., Prihatiningrum, A. E., & Nurmalasari, I. R. (2022, November). Effect of types and concentration of liquid organic fertilizer on the growth and production of pakcoy plants (Brassica Rapa L.). In IOP Conference Series: Earth and Environmental Science (Vol. 1104, No. 1, p. 012010). IOP Publishing. doi:10.1088/1755-1315/1104/1/012010

Napitupulu, F., Siregar, M., & Ginting, T. Y. (2025). Efektivitas pemberian pupuk organik cair kulit bawang merah dengan air kelapa dan pemberian pupuk kotoran sapi terhadap pertumbuhan dan produksi tanaman sawi kailan (Brassica oleraceae var. Acephala). Jurnal Agroplasma, 12(1), 285–294.https://doi.org/10.36987/agroplasma.v12i1.7204

Pamungkas, P., & Hidayat, Y. N. A. (2024). Effect of Nitrogen and Humic Acid on Growth and Yield of Pakcoy (Brassica rapa subsp. chinensis) Plants. Jurnal Agrosci, 2(1), 1-12. https://doi.org/10.62885/agrosci.v2i1.399.

Panataria, L. R., Simanjuntak, P., Sitorus, E., Saragih, M. K., & Manurung, A. I. (2024). Response of Pakcoy Plant Growth and Production to the Application of Poc and Manure. Journal of Agriculture, 3(02), 67-76.https://doi.org/10.47709/joa.v3i02.

Panday, D., Bhusal, N., Das, S., & Ghalehgolabbehbahani, A. (2024). Rooted in nature: the rise, challenges, and potential of organic farming and fertilizers in agroecosystems. Sustainability, 16(4), 1530.https://doi.org/10.3390/su16041530

Putri, Y. D. A., & Kurniasih, S. (2022). Efektivitas kulit bawang merah (Allium ascalonicum) terhadap pertumbuhan pakcoy (Brassica rapa). Ekologia: Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup, 21(2), 44–53.https://doi.org/10.33751/ekologia.v21i2.3635

Rahayu, A., Tejowulan, R. S., & Bakar, B. A. (2023). Efektivitas Berbagai Dosis Pupuk Phonska Pada Media Tanam Buatan Terhadap Ketersediaan P dan K Tertukar Tanah Serta Hasil Pakcoy. Journal of Soil Quality and Management, 2(2), 52-60. https://share.google/hFSLEPU0jfLUB0ESb

Rezeki, D. T., Jayati, R. D., Harmoko, H., & Lestari, F. (2023). Efektivitas kombinasi pupuk organik cair (POC) kulit bawang merah (Allium cepa L.), kotoran kambing, limbah ikan, dan air leri terhadap pertumbuhan mentimun (Cucumis sativus). Borneo Journal of Biology Education (BJBE), 5(1), 50–59.https://doi.org/10.35334/bjbe.v5i1.398810.29303/jbt.v25i4.10393

Safitri, I., Mertha, I. G., & Raksun, A. (2025). Influence of NPK and Bokashi on Growth and Chlorophyll Content of Pakcoy (Brassica rapa L.). Jurnal Biologi Tropis, 25(4), 5019-5029. http://doi.org/10.29303/jbt.v25i4.10393

Wani, B. A., Rashid, S., Rashid, K., Javid, H., Magray, J. A., ul Qadir, R., & Islam, T. (2022). Nitrogen deficiency in plants. In Advances in plant nitrogen metabolism (pp. 28-37). CRC Press.https://www.researchgate.net/publication/3656l39915_Nitrogen_Deficiency_in_Plantsutm_source

Widyasari, A. N., Widarawati, R., Suparto, S. R., & Syarifah, R. N. K. (2022). Kajian fisiologi tanaman sawi pagoda (Brassica rapa L. ssp. Narinosa) dengan berbagai media tanam dan konsentrasi pupuk organik cair sampah sayur. Vegetalika, 11(4), 329-341.https://doi.org/10.22146/veg.73926

Yusminan, Y., Walida, H., Harahap, F. S., & Mustamu, N. E. (2022). Comparison of Jakaba growth with the addition of organic matter in rice washing water. International Journal of Science and Environment (IJSE), 2(3), 74-78. https://doi.org/10.51601/ijse.v2i3.16

Zakiyah, Z. N., Rahmawati, C., & Fatimah, I. (2018). Analysis of phosphorus and potassium levels in organic fertilizer in the integrated Laboratory of Jombang District Agriculture Office. Indonesian Journal of Chemical Research, 38-48. doi: 10.20885/ijcr.vol3.iss2.

Zhang, Y., Yu, S., Li, Z., Chang, T., Xu, Q., Xu, H., & Zhang, J. (2022). Effects of excessive nitrogen fertilizer and soil moisture deficiency on antioxidant enzyme system and osmotic adjustment in tomato seedlings. International Journal of Agricultural and Biological Engineering, 15(2), 127-134.Open Access at https://www.ijabe.org

Zhang, Y., Zhang, J., Zhang, J., Li, H., Li, C., & Wang, X. (2024). Effects of the application of organic fertilizers on the yield, quality, and soil properties of open-field Chinese cabbage (Brassica rapa spp. pekinensis) in China: a meta-analysis. Agronomy, 14(11), 2555.https://doi.org/10.3390/agronomy14112555