Miura, Toshiko and Owada, Kento and Nishina, Kazuya and Utomo, Muhajir and Niswati, Ainin and Kaneko, Nobuhiro and Fujie, Koichi (2016) The Effects of Nitrogen Fertilizer on Soil Microbial Communities Under Conventional and Conservation Agricultural Managements in a Tropical Clay-Rich Ultiso. Soil Science, 181 (2). pp. 68-74. ISSN 0038-075X

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Abstract

The response of microbial communities to N fertilizer varies depending on environmental and management-related factors. However, few studies have compared the effects of N fertilization on microbial communities under different agricultural management. We thus compared the biomass and composition of microbial communities in N-fertilized and unfertilized long-term (25 years) fields managed under conventional tillage with crop residue removal (CTR) and no-tillage with crop residue mulch (NTM) systems. Soil samples were taken in January 2011 and July 2012 at a depth of 0 to 10 cm, and phospholipid fatty acid (PLFA) profiles were measured. Fungal abundance was lower in N-fertilized soils than in unfertilized soils under both management systems at both sampling times. Bacterial abundance was lower in N-fertilized soils than in unfertilized soils under the CTR system, whereas no difference was observed between N-fertilized and unfertilized soils under the NTM system in January 2011. However, in July 2012, bacterial abundance was lower in N-fertilized soils than in N fertilized soils under both management systems. Principal component analysis of the PLFA profiles showed that N fertilizer had a significant effect on the PLFA composition under the CTR system but had less impact under the NTM system. These results suggest that (i) fungal biomass is negatively affected by N fertilizer regardless of management system; (ii) bacterial response to N fertilizer differs temporally between management systems, reflecting temporal changes in soil C content; and (iii) the NTM system mitigates N effects on the composition of soil microbial communities.

Item Type:	Article
Subjects:	S Agriculture > S Agriculture (General)
Divisions:	Fakultas Pertanian (FP) > Prodi Ilmu Tanah
Depositing User:	Prof Dr Ainin Niswati
Date Deposited:	03 Oct 2016 01:23
Last Modified:	04 Nov 2016 03:25
URI:	http://repository.lppm.unila.ac.id/id/eprint/703

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