Pengaruh Asam Humat terhadap Produktivitas dan Serapan Nitrogen pada Tanaman Kangkung Darat (Ipomoea reptans Poir.)
An uncertain climate and infertile soils are factors that cause fluctuations in crop yields. In addition, improper application of fertilizers causes kangkong plants to not absorb nutrients optimally. The application of humic acid as a biostimulant can be used to improve soil structure and optimize the productivity of kangkong through the absorption of nutrients from fertilizers or elements around plants. This study aims to study the effect of application of humic acid on growth, productivity, and nitrogen uptake in kangkong (Ipomoea reptans). This research was carried out with completely randomized design (CRD) with a single factor including 7 treatments, namely control, application of humic acid through leaves at a dose of 5 mg.L-1, 20 mg.L-1, and mg.L-1 and through roots a dose of 5 mg.L-1, 20 mg.L-1, and 35 mg.L-1. Planting media used without the addition of basic fertilizers to see the most effective effect of the application of humic acid. The results showed that application of humic acid dose of 20 mg / L through leaves and roots caused an increase in plant height, stem diameter, number of leaves, biomass and nitrogen uptake of kangkong. The highest chlorophyll level of kangkong plants was produced in the treatment of humic acid dose of 35 mg.L-1 through leaves. Based on the research it can be concluded that the application of humic acid through leaves and roots increase growth, productivity and nitrogen uptake in kangkong.
Keywords: humic acid, Ipomoea reptans, nitrogen, productivity
ACIAR. 1990. Laboratory Techniques for Plant and Soil Analysis. Armidal: Department of Agronomy and Soil Science University of New England.
Alshaal T, El-Ramady HR. 2017. Foliar application: from plant nutrition to biofortification. The Environment, Biodiversity & Soil Security. 1(6): 71-283. https://doi.org/10.21608/jenvbs.2017.1089.1006
Barker AV, Pilbeam DJ. 2015. Handbook of Plant Nutrition. London (EN): CRC Press. https://doi.org/10.1201/b18458
Delfine S, Tognetti R, Desiderio E, Alvino A. 2005. Effect of foliar application of N and humic acids on growth and yield of durum wheat. Agronomy for Sustainable Development. 25(2): 183-2191. https://doi.org/10.1051/agro:2005017
de Melo BAG, Motta FL, Santana MHA. 2016. Humic acids: structural properties and multiple functionalities for novel technological developments. Material Science Engineering C. 62: 967-974. https://doi.org/10.1016/j.msec.2015.12.001
Demarty M, Morvan C, Thellier M. 1984. Calcium and the cell wall. Plant, Cell and Environment. 7(6): 441-448. https://doi.org/10.1111/j.1365-3040.1984.tb01434.x
Grubben GJH. 2004. Plant Resources of Tropical Africa 2: Vegetables. Wageningen (ND): Backhuys Publisher.
Hermanto D, Dharmayani NKT, Kurnianingsih R, Kamali SR. 2013. Pengaruh asam humat sebagai pelengkap pupuk terhadap ketersediaan dan pengambilan nutrien pada tanaman jagung di lahan kering kec.Bayan-NTB. Jurnal Ilmu Pertanian. 16(2): 28-41.
Kataki PK, Babu SC. 2002. Food System for Improved Human Nutrition: Linking Agriculture, Nutrition, and Productivity. New York (US): CRC Press.
Kementerian Pertanian. 2016. Statistik produksi hortikultura Tahun 2015. Direktorat Jenderal Hortikultura, Kementerian Pertanian.
Khaled H, Fawy HA. 2011. Effect of different levels of humic acids on the nutrient content, plant growth, and soil properties under conditions of salinity Soil and Water Research. 6(1): 21-29. https://doi.org/10.17221/4/2010-SWR
Ling F, Silberbush M. 2002. Response of maize to foliar vs. soil application of nitrogen-phosphorus-potassium fertilizers. Journal of Plant Nutrition. 25(11): 2333-2342. https://doi.org/10.1081/PLN-120014698
Maghfoer D. 2018. Teknik Pemupukan Terung Ramah Lingkungan. Malang (ID): UB Press.
Mayi AA, Ibrahim ZR, Abdurrahman AS. 2014. Effect of foliar spray of humic acid, ascorbic acid, cultivars and their interactions on growth of olive (Olea european L.) transplants cvs. khithairy and sorany. Journal of Agriculture and Veterinary Science. 7(4): 18-30. https://doi.org/10.9790/2380-07421830
Mindari W, Aini N, Kusuma Z, Syekhfani. 2014. Effects of humic acid-based buffer + cation on chemical characteristics of saline soils and maize growth. Journal of Degraded and Mining Lands Management. 2(1): 259-268.
Mora V, Bacaicoa E, Zamarreño AM, Aguirre E, Garnica M, Fuentes M, Garcia-Mina JM. 2010. Action of humic acid on promotion of cucumber shoot growth involves ntrate-related changes associated with the root-to-shoot distribution of cytokinins, polyamines and mineral nutrients. Journal of Plant Physiology. 167(8): 633-642. https://doi.org/10.1016/j.jplph.2009.11.018
Mora V, Baigorri R, Bacaicoa E, Zammareño AM, Garcia-Mina JM. 2012. The humic acid-induced changes in the root concentration of nitric oxide, IAA and ethylene do not explain the changes in root architecture caused by humic acid in cucumber. Environmental and Experimental Botany. 76: 24-32. https://doi.org/10.1016/j.envexpbot.2011.10.001
Roemheld V, El-Fouly MM. 1999. Foliar nutrient application: Challenges and limits in crop production. The 2nd International Workshop on Foliar Fertilization, Thailand (TH): April 4-10, 1999.
Rosmarkam A, Yuwono NW. 2002. Ilmu Kesuburan Tanah. Yogyakarta (ID): Penerbit Kanisius.
Sani B. 2014. Foliar application of humic acid on plant height in canola. APCBEE Procedia. 8: 82-86. https://doi.org/10.1016/j.apcbee.2014.03.005
Sarno, Fitria E. 2012. Pengaruh aplikasi asam humat dan pupuk N terhadap pertumbuhan dan serapan N pada tanaman bayam (Amaranthus spp.). Prosiding SN-SMAIP III-2012.
Selim EM, Shaymaa IS, Faiz FA, El-Neklawy AS. 2012. Interactive effects of humic acid and water stress on chlorophyll and mineral nutrient contents of potato plants. Journal of Applied Sciences Research. 8(1): 531-537.
Tahir NA, Karim HFH. 2010. Impact of magnetic application on the parameter related to growth of chickpea (Cicer arietinum L.). Jordan Journal of Biological Science. 3: 175-183.
Talreja T. 2011. Biochemical estimation of three primary metabolites from medicinally important plant Moringa oleifera. International Journal of Pharmaceutical Sciences Review and Research. 7(2): 186-188.
Tufail MK, Nawaz K, Usman M. 2014. Impact of humic acid on the morphology and yield of wheat (Triticum aestivum L.). World Applied Sciences Journal. 30(4): 475-480.
Varrault G, Camel V, Bermond A. 2000. Adsorption of trace metal ion on humic acid. Proceedings 10th International Meeting of the International-Humic Substances Society. pp. 587-588
Werner T, Motyka V, Strnad M, Schmulling T. 2001. Regulation of plant growth by cytokinin. Proceedings of the National Academy of Sciences. 98(18): 10487-10492. https://doi.org/10.1073/pnas.171304098
Yildrim E. 2007. Foliar and soil fertilization of humic acid affect productivity and quality of tomato. Acta Agriculturae Scandinavica Section B-Soil and Plant Science. 57(2): 182-186. https://doi.org/10.1080/09064710600813107
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).