Barus, Yunita and Lumbanraja, Jamalam and Sudarsono, Hamim and Dermiyati, - (2019) A Litterbag Study: Decomposition Rate and C/N Ratio of Annual Crop Biomass Residues on An Ultisols in Natar Village, South Lampung, Indonesia. Pertanika Journal of Tropical Agricultural Science, 42 (1). 387 -403. ISSN 15113701

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Abstract

To evaluate the decomposition rate and the C/N ratio of biomass residues from several crops that are the main food sources in Indonesia, a litterbag study was conducted from February to November 2016 on ultisols in Natar Village, South Lampung, Indonesia. There were four types of crops biomass residues used i.e., maize stovers, rice straws, shoots and leaves of cassava, and soybean stovers in the form of fresh or compost. A fifty gram dry weight of biomass was put into a litterbag, placed above the ground and at a depth of about 10-20 cm, and incubated for nine months. The remaining biomass (dry weight), the content of Organic-C, Total-N, and C/N levels of the remaining biomass in the litterbag were observed every month until nine months. The dry weight of biomass was obtained by an oven dried at 70°C for approximately 48 hours until reached the constant weight. The decomposition rates were measured as (k) = ln (X/Xo)/t. Results showed that the decomposition rate of the biomass residues of the four crops were different. The shoots and leaves of cassava biomass were most rapidly decomposed (k =-0.2830) and significantly different from others, followed by maize stover (k=-0.2066), rice straw (k = -0.1924), and soybean stover (k = -0.1675). Junita Barus, Jamalam Lumbanraja, Hamim Sudarsono and Dermiyati 388 Pertanika J. Trop. Agric. Sc. 42 (1): 387 - 403 (2019) Biomass of fresh or compost form and litterbag placement generally affected the decomposition rate of biomass residues. Keywords: Biomass, carbon, crop residues, decomposition, nitrogen

Item Type: Article
Subjects: S Agriculture > S Agriculture (General)
Divisions: Fakultas Pertanian (FP) > Prodi Doktor Ilmu Pertanian
Depositing User: Prof.Dr.Ir Jamalam Lumbanraja
Date Deposited: 29 Apr 2019 08:58
Last Modified: 29 Apr 2019 08:58
URI: http://repository.lppm.unila.ac.id/id/eprint/10917

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