Utomo, Muhajir and Lumbanraja, Jamalam and Syam, Tamaluddin and Akbar, Fajri taufik (2017) Prosiding International Symposium on Soil Management for SUstainable Agriculture. In: International Symposium on Soil Management for SUstainable Agriculture.

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Abstract

In the tropics, soil organic carbon (SOC) has important role on enhancing soil health and productivity, but easily degraded by current soil management. The objective of this experiment was to determine the influence of long-term no-tillage and N fertilization on soil C stock and soil C sequestration. The long-term experiment was initially established in February 1987, at experiment farm of Politeknik Negeri Lampung, Sumatra, Indonesia. The soil is Udult, clayey, slope ranging from 6 to 9%, with elevation 122 m. The experiment was a factorial, randomized complete block design, with 4 replications. Tillage treatments were no-tillage (NT), minimum tillage (MT) and conventional tillage (CT); while nitrogen fertilization rates were 0 kg N ha-1 (N0) and 200 kg N ha-1 (N1). Soil samples were taken in February 2016 at 0-20 cm depth for all treatments, but only combination treatments of NTN1 and CTN1 for the representative profiles. It revealed that after 29 years of cropping, there were significantly influences of tillage and N fertilization on soil C stock and C sequestration (P<0.05). Soil C stock of no-tillage at 0-20 cm depth was 35.4 Mg C ha-1, or 12.8% higher than CT, but not difference than MT. While soil C stock in 0 kg N/ha treatment was 34.9 Mg C ha-1, or 7.7% higher than 200 kg N ha-1 treatment (P<0.05). In soil profile up to 60 cm depth, C stock under NT, CT and reference site were 57.1, 55.6 and 47.9 Mg C ha-1, respectively. Soil C sequestration rate by NT was the highest (118.4 kg C ha-1yr-1), but not significantly different than MT (71.8 kg C ha-1yr-1). While in contrast, soil C sequestration under CT was significanly the lowest (-20.7 kg C ha-1yr-1). Soil C sequestration rate by N fertilization was lower 14.3 kg C ha-1yr-1 than no N fertilization (98.7 kg C ha-1yr-1)

Item Type:	Conference or Workshop Item (Paper)
Subjects:	S Agriculture > S Agriculture (General)
Divisions:	Fakultas Pertanian (FP) > Prodi Ilmu Tanah
Depositing User:	MUHAJIR UT
Date Deposited:	15 Nov 2017 04:50
Last Modified:	15 Nov 2017 04:50
URI:	http://repository.lppm.unila.ac.id/id/eprint/4687

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