Conference presentation
Nitrogen cycling enhanced by conservation agriculture in a rice-based cropping system of the eastern Indo-Gangetic Plain
2016 International Nitrogen Initiative (INI) Conference (Melbourne, Australia, 04/12/2016–08/12/2016)
2016
Abstract
Changes in soil tillage and residue retention after introducing conservation agriculture practices in intensive rice-based cropping systems in Bangladesh may alter nitrogen (N) cycling and N fertilizer requirements. An experiment was established on a farmer’s field, with a legume dominated-rotation (lentil-mungbean-monsoon rice), two types of tillage – strip planting (SP) and conventional tillage (CT); and two levels of residue retention – high residue (HR) and low residue (LR). A total seven crops were studied in the 2.5 year periods (2010-13). Soil total N concentration (TN), soil N-stocks after Crop 7 and the annual N accumulation rates at 0-15 cm soil depth for 2010-13 are presented. At the end of Crop 7 (after 2.5 years), SP treatment increased the TN concentrations and N-stocks by 11 % compared to CT at 0-15 cm soil depth. The annual soil N accumulation rates were 66 kg/ha with SP while N losses were 20 kg/ha under CT during 2010-13. The N accumulation rate was 3.3 times higher with HR than LR. From 2010 to 2013, the N balance calculation indicated an estimated N gain of 51 kg/ha in SPHR but a loss in CT which ranged from 9 kg/ha in CTHR to 319 kg/ha in CTLR at 0-15 cm soil depth. The N uptake was also 14 % higher from grain and straw under SP than CT. Both SP and HR increased TN, N-stocks and N accumulation by contrast with N loss under CT. However, the turnover of TN in SPHR needs longer investigation because of likely effects on N fertiliser requirements.
Details
- Title
- Nitrogen cycling enhanced by conservation agriculture in a rice-based cropping system of the eastern Indo-Gangetic Plain
- Authors/Creators
- M.A. Islam (Author/Creator)R.W. Bell (Author/Creator)C. Johansen (Author/Creator)M. Jahiruddin (Author/Creator)M.E. Haque (Author/Creator)
- Conference
- 2016 International Nitrogen Initiative (INI) Conference (Melbourne, Australia, 04/12/2016–08/12/2016)
- Identifiers
- 991005540253407891
- Murdoch Affiliation
- School of Veterinary and Life Sciences
- Language
- English
- Resource Type
- Conference presentation
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