Journal of Experimental Biology and Agricultural Sciences http://www.jebas.org ISSN No. 2320 – 8694 Journal of Experimental Biology and Agricultural Sciences, December - 2021; Volume – 9(6) page 770 – 780 EFFECT OF DOLOMITE AND CHICKEN MANURE APPLICATION ON PAK CHOI (Brassica rapa chinensis) PRODUCTION AND CARBON DIOXIDE EMISSIONS IN TROPICAL PEATLANDS Salampak 1# , Adi Jaya 1#* , Paska Aprianto 2 , Susi Kresnatita 1 1 Faculty of Agriculture, University of Palangka Raya, Indonesia 2 Postgraduate Program on Natural Resources and Environmental Management, University of Palangka Raya, Indonesia # shared first authorship Received – September 04, 2021; Revision – November 07, 2021; Accepted – December 28, 2021 Available Online – December 30, 2021 DOI: http://dx.doi.org/10.18006/2021.9(6).770.780 ABSTRACT The current study was aimed to determine the effect of ameliorant on Pak choi ( Brassica rapa chinensis) productivity, CO2 emissions, and factors affecting the rate of CO2 emission. The study was carried out using a non-factorial completely randomized design with seven treatments. The imposed treatment are without ameliorant (control), 10, 20, 30 ton ha -1 chicken manure, 4 ton ha -1 Dolomite + Chicken Manure @ 10 ton ha -1 , Dolomite 4 ton ha -1 + Chicken Manure @ 20 ton ha -1 and Dolomite 4 ton ha -1 + Chicken Manure @ 30 ton ha -1 . The variables observed are the chemical properties of peat soil, fresh and dry weight of pak choi, CO2 emissions, and factors that affect CO2 emissions. The results of the study revealed that the combination of Dolomite and chicken manure has a significant effect on the studied parameters and the combination of 4 ton ha -1 dolomite + 30 ton ha -1 chicken manure had the highest pH change (average of 6.36), highest productivity, and CO2 emission (344.42 mg cm -2 hr -1 ). Results of the study can be concluded that Dolomite and chicken manure has a significant effect on the various growth parameters of B. rapa chinensis and the properties of the peat soil. * Corresponding author KEYWORDS Ameliorant CO2 Emissions Pak choi Peat Soil E-mail: adijaya@agr.upr.ac.id (Adi Jaya) Peer review under responsibility of Journal of Experimental Biology and Agricultural Sciences. All the articles published by Journal of Experimental Biology and Agricultural Sciences are licensed under a Creative Commons Attribution-NonCommercial 4.0 International License Based on a work at www.jebas.org. Production and Hosting by Horizon Publisher India [HPI] (http://www.horizonpublisherindia.in/). All rights reserved.