Advanced search
1 file | 3.18 MB

Impact of irrigation management on paddy soil N supply and depth distribution of abiotic drivers

Author
Organization
Abstract
In rice production, water-saving irrigation management is expanding and likely alters depth profiles of soil moisture, redox potential (Eh) and microbial activity. It is, however, unclear how such conditions then impact net soil N-release and availability to the rice crop, because we do not know well enough how water-saving irrigation management shapes depth-distribution of Eh and reductive processes, and microbial activity. A field experiment with rice was laid out on a typical young floodplain paddy soil of Bangladesh with three irrigation schemes, viz. continuous flooding (CF), safe alternate wetting and drying (AWD) and direct seeded rice (DSR), with 120 kg N ha(-1) (N-120) or without (N-0) urea application. We evaluated changes in soil mineral N and plant N uptake, CH4 and CO2 emissions and soil pH, and at multiple depths soil Eh and temperature, dissolved C, Fe and Mn throughout 2015 dry (Boro) season (Jan-Apr). Eh stayed at or above similar to + 300 mV except for sudden drops to similar to -200 mV with irrigation events in DSR. Eh quickly dropped to methanogenic conditions, under both AWD and CF; rises to similar to + 200 mV were observed during AWD-drainage events but were restricted to upper 5.5 or 12.5 cm depths. Throughout the growing season there was a pronounced increase in reductive dissolution of Fe and Mn (hydro-) oxides, buildup of dissolved C, and CH4 effluxes under AWD and CF but not DSR, likely at least partially driven by the gradual soil warming from similar to 20 degrees C till 28 degrees C. Predominant aerobic conditions under DSR lead to a nearly doubled C-emissions (CO2 + CH4) compared to AWD and CF, suggesting more soil organic matter (OM) degradation in the former case, while soil mineral N plus plant N build-up rate followed an opposite order. Urea application did not raise soil exchangeable N levels, even prior to significant plant uptake from 28 DAT (days after transplanting), and we forward temporal abiotic NH4+-fixation and N-removal processes as explanations. We conclude that regardless of some distinctions in temporal evolutions of puddle layer Eh, solution C, Fe and Mn, and CH4-emission, soil N-supply was quite comparable under AWD and CF, as was rice yield. In the context of N availability, AWD could be safely adopted for rice growth in the Bangladeshi Boro season. The eventual fertilizer N recovery efficiency was higher for CF (42%) than for AWD (32%), but AWD saved 12% irrigation water. While DSR saved 45% water there was a large yield penalty, likely due to drought stress but also by poor germination caused by cold night temperatures in mid-January, while seedling transplantation in CF and AWD plots was only later on 28 January. Further research should be conducted to investigate the fast and pronounced removal of exchangeable inorganic N after initial N buildup by soil OM mineralization, especially in CF and AWD. At this moment most likely candidate processes appear clay-NH4+ fixation and anaerobic NH4+-oxidation.
Keywords
Redox potential, Fe-Mn, Reductive dissolution, N mineralization, Water management, DISSOLVED ORGANIC-MATTER, RICE STRAW INCORPORATION, NITROUS-OXIDE EMISSIONS, DRYING IRRIGATION, METHANE EMISSION, WATER MANAGEMENT, AMMONIUM FIXATION, REDOX CONDITIONS, USE EFFICIENCY, IRON-OXIDES

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 3.18 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Akter, Masuda, Heleen Deroo, Ahammad Mostafa Kamal, Mohammed Abdul Kader, Elizabeth Verhoeven, Charlotte Decock, Pascal Boeckx, and Steven Sleutel. 2018. “Impact of Irrigation Management on Paddy Soil N Supply and Depth Distribution of Abiotic Drivers.” Agriculture Ecosystems & Environment 261: 12–24.
APA
Akter, M., Deroo, H., Kamal, A. M., Kader, M. A., Verhoeven, E., Decock, C., Boeckx, P., et al. (2018). Impact of irrigation management on paddy soil N supply and depth distribution of abiotic drivers. AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 261, 12–24.
Vancouver
1.
Akter M, Deroo H, Kamal AM, Kader MA, Verhoeven E, Decock C, et al. Impact of irrigation management on paddy soil N supply and depth distribution of abiotic drivers. AGRICULTURE ECOSYSTEMS & ENVIRONMENT. 2018;261:12–24.
MLA
Akter, Masuda, Heleen Deroo, Ahammad Mostafa Kamal, et al. “Impact of Irrigation Management on Paddy Soil N Supply and Depth Distribution of Abiotic Drivers.” AGRICULTURE ECOSYSTEMS & ENVIRONMENT 261 (2018): 12–24. Print.
@article{8558386,
  abstract     = {In rice production, water-saving irrigation management is expanding and likely alters depth profiles of soil moisture, redox potential (Eh) and microbial activity. It is, however, unclear how such conditions then impact net soil N-release and availability to the rice crop, because we do not know well enough how water-saving irrigation management shapes depth-distribution of Eh and reductive processes, and microbial activity. A field experiment with rice was laid out on a typical young floodplain paddy soil of Bangladesh with three irrigation schemes, viz. continuous flooding (CF), safe alternate wetting and drying (AWD) and direct seeded rice (DSR), with 120 kg N ha(-1) (N-120) or without (N-0) urea application. We evaluated changes in soil mineral N and plant N uptake, CH4 and CO2 emissions and soil pH, and at multiple depths soil Eh and temperature, dissolved C, Fe and Mn throughout 2015 dry (Boro) season (Jan-Apr). Eh stayed at or above similar to + 300 mV except for sudden drops to similar to -200 mV with irrigation events in DSR. Eh quickly dropped to methanogenic conditions, under both AWD and CF; rises to similar to + 200 mV were observed during AWD-drainage events but were restricted to upper 5.5 or 12.5 cm depths. Throughout the growing season there was a pronounced increase in reductive dissolution of Fe and Mn (hydro-) oxides, buildup of dissolved C, and CH4 effluxes under AWD and CF but not DSR, likely at least partially driven by the gradual soil warming from similar to 20 degrees C till 28 degrees C. Predominant aerobic conditions under DSR lead to a nearly doubled C-emissions (CO2 + CH4) compared to AWD and CF, suggesting more soil organic matter (OM) degradation in the former case, while soil mineral N plus plant N build-up rate followed an opposite order. Urea application did not raise soil exchangeable N levels, even prior to significant plant uptake from 28 DAT (days after transplanting), and we forward temporal abiotic NH4+-fixation and N-removal processes as explanations. We conclude that regardless of some distinctions in temporal evolutions of puddle layer Eh, solution C, Fe and Mn, and CH4-emission, soil N-supply was quite comparable under AWD and CF, as was rice yield. In the context of N availability, AWD could be safely adopted for rice growth in the Bangladeshi Boro season. The eventual fertilizer N recovery efficiency was higher for CF (42\%) than for AWD (32\%), but AWD saved 12\% irrigation water. While DSR saved 45\% water there was a large yield penalty, likely due to drought stress but also by poor germination caused by cold night temperatures in mid-January, while seedling transplantation in CF and AWD plots was only later on 28 January. Further research should be conducted to investigate the fast and pronounced removal of exchangeable inorganic N after initial N buildup by soil OM mineralization, especially in CF and AWD. At this moment most likely candidate processes appear clay-NH4+ fixation and anaerobic NH4+-oxidation.},
  author       = {Akter, Masuda and Deroo, Heleen and Kamal, Ahammad Mostafa and Kader, Mohammed Abdul and Verhoeven, Elizabeth  and  Decock,  Charlotte and Boeckx, Pascal and Sleutel, Steven},
  issn         = {0167-8809},
  journal      = {AGRICULTURE ECOSYSTEMS \& ENVIRONMENT},
  keyword      = {Redox potential,Fe-Mn,Reductive dissolution,N mineralization,Water management,DISSOLVED ORGANIC-MATTER,RICE STRAW INCORPORATION,NITROUS-OXIDE EMISSIONS,DRYING IRRIGATION,METHANE EMISSION,WATER MANAGEMENT,AMMONIUM FIXATION,REDOX CONDITIONS,USE EFFICIENCY,IRON-OXIDES},
  language     = {eng},
  pages        = {12--24},
  title        = {Impact of irrigation management on paddy soil N supply and depth distribution of abiotic drivers},
  url          = {http://dx.doi.org/10.1016/j.agee.2018.03.015},
  volume       = {261},
  year         = {2018},
}

Altmetric
View in Altmetric
Web of Science
Times cited: