scholarly journals Tillage and Coated-Urea Effects on Nitrous Oxide Emissions from Direct-Seeded, Delayed-Flood Rice Production in Arkansas

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Rector Casey ◽  
Brye Kristofor R ◽  
Humphreys Joshua ◽  
Norman Richard J ◽  
Slaton Nathan A ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Rice Production ◽  
Nitrous Oxide Emissions ◽  
Coated Urea ◽  
Direct Seeded

Evaluation of Polymer-Coated Urea for Direct-Seeded, Delayed-Flood Rice Production

2009 ◽  
Vol 73 (2) ◽  
pp. 375-383 ◽  
Author(s):  
B.R. Golden ◽  
N.A. Slaton ◽  
R.J. Norman ◽  
C.E. Wilson ◽  
R.E. DeLong
Keyword(s):  
Rice Production ◽  
Coated Urea ◽  
Direct Seeded ◽  
Polymer Coated Urea

The nitrification inhibitor DMPP applied to subtropical rice has an inconsistent effect on nitrous oxide emissions

Soil Research ◽  
2017 ◽  
Vol 55 (6) ◽  
pp. 547 ◽  
Author(s):  
Terry J. Rose ◽  
Stephen G. Morris ◽  
Peter Quin ◽  
Lee J. Kearney ◽  
Stephen Kimber ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrification Inhibitor ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Aerobic Rice ◽  
Growing Period ◽  
Tropical Environments ◽  
Peak Flux ◽  
Coated Urea ◽  
Fertiliser Application

Although there is growing evidence that the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) can lower soil nitrous oxide (N2O) emissions in temperate environments, there is little evidence of its efficacy in subtropical or tropical environments where temperatures and rainfall intensities are typically higher. We investigated N2O emissions in field-grown aerobic rice in adjacent fields in the 2013–14 and 2014–15 seasons in a subtropical environment. Crops were topdressed with 80 kg nitrogen (N) ha–1 before rainfall, as either urea, urea + DMPP (at 1.6 kg DMPP t–1 urea: ‘urea-DMPP’) or a blend of 50% urea and 50% urea-DMPP in the 2013–14 season, and urea, urea-DMPP or polymer (3 month)-coated urea (PCU) in the 2014–15 season. DMPP-urea significantly (P < 0.05) lowered soil N2O emissions in the 2013–14 season during the peak flux period after N fertiliser application, but had no effect in 2014–15. The mean cumulative N2O emissions over the entire growing period were 190 g N2O-N ha–1 in 2013–14 and 413 g N2O-N ha–1 in 2014–15, with no significant effect of DMPP or PCU. Our results demonstrate that DMPP can lower N2O emissions in subtropical, aerobic rice during peak flux events following N fertiliser application in some seasons, but inherent variability in climate and soil N2O emissions limited the ability to detect significant differences in cumulative N2O flux over the seasonal assessment. A greater understanding of how environmental and soil factors impact the efficacy of DMPP in the subtropics is needed to formulate appropriate guidelines for its use commercially.

Methane and nitrous oxide emissions from direct-seeded and seedling-transplanted rice paddies in southeast China

2013 ◽  
Vol 374 (1-2) ◽  
pp. 285-297 ◽  
Author(s):  
Shuwei Liu ◽  
Yaojun Zhang ◽  
Feng Lin ◽  
Ling Zhang ◽  
Jianwen Zou
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Rice Paddies ◽  
Southeast China ◽  
Transplanted Rice ◽  
Direct Seeded

scholarly journals Nitrous oxide emissions with enhanced efficiency and conventional urea fertilizers in winter wheat

2021 ◽  
Author(s):  
Haibo An ◽  
Jen Owens ◽  
Brian Beres ◽  
Yuejin Li ◽  
Xiying Hao
Keyword(s):  
Nitrous Oxide ◽  
Winter Wheat ◽  
Nitrification Inhibitor ◽  
Field Trials ◽  
Early Spring ◽  
Nitrous Oxide Emissions ◽  
Nitrification Inhibitors ◽  
Late Fall ◽  
Coated Urea ◽  
Polymer Coated Urea

AbstractOptimizing nitrogen fertilizer management can reduce nitrous oxide (N2O) emissions. This study tested if split applying enhanced efficiency fertilizers (EEFs) resulted in lower N2O emissions than applying equivalent rates of urea at planting. In semiarid southern Alberta, field trials were conducted during three years (planting to harvest) in rainfed winter wheat crops. Annual fertilizer rates ranged from 146 to 176 kg N ha−1. Fertilizer types were urea, and three EEFs (polymer-coated urea, urea with urease and nitrification inhibitors, and urea with a nitrification inhibitor). Each fertilizer type was applied three ways: 100% banded at planting, split applied 30% banded at planting and 70% broadcast in late fall, and split applied 30% banded at planting and 70% broadcast at Feekes growth stage 4 (GS4, post-tiller formation, wheat entering the greening up phase in the early spring). Nitrous oxide was measured using static chambers between sub-weekly and monthly from planting to harvest. Over three years, cumulative N2O emissions ranged from 0.16 to 1.32 kg N ha−1. This was equivalent to emissions factors between 0.009 and 0.688%. Cumulative N2O emissions and emissions factors did not differ between fertilizer types, but they were lower when fertilizer was split applied at GS4 compared to in late fall (P ≤ 0.10). Our study suggests that EEFs do not reduce N2O emissions from rainfed winter wheat crops, but a well-timed split application with a majority of fertilizer applied after winter can minimize N2O emissions.

scholarly journals Oil-based polyurethane-coated urea reduces nitrous oxide emissions in a corn field in a Maryland loamy sand soil

2020 ◽  
Vol 249 ◽  
pp. 119329 ◽  
Author(s):  
Ricardo Bortoletto-Santos ◽  
Michel A. Cavigelli ◽  
Sheila E. Montes ◽  
Harry H. Schomberg ◽  
Anh Le ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Loamy Sand ◽  
Nitrous Oxide Emissions ◽  
Sand Soil ◽  
Loamy Sand Soil ◽  
Corn Field ◽  
Coated Urea

Seasonal Methane and Nitrous Oxide Emissions of Several Rice Cultivars in Direct-Seeded Systems

2015 ◽  
Vol 44 (1) ◽  
pp. 103-114 ◽  
Author(s):  
Maegen B. Simmonds ◽  
Merle Anders ◽  
Maria Arlene Adviento-Borbe ◽  
Chris van Kessel ◽  
Anna McClung ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Rice Cultivars ◽  
Direct Seeded

scholarly journals Modeling methane and nitrous oxide emissions from direct-seeded rice systems

2015 ◽  
Vol 120 (10) ◽  
pp. 2011-2035 ◽  
Author(s):  
Maegen B. Simmonds ◽  
Changsheng Li ◽  
Juhwan Lee ◽  
Johan Six ◽  
Chris van Kessel ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Direct Seeded

scholarly journals Adaptation Approaches for Direct Seeded Rice to Reduce Greenhouse Gas Emission in the Perspective of Climate Change

2019 ◽  
pp. 643-651
Author(s):  
Suborna Roy Choudhury ◽  
Anupam Das ◽  
Veena Bharati ◽  
Swaraj Kumar Dutta
Keyword(s):  
Nitrous Oxide ◽  
Greenhouse Gas ◽  
Management Practices ◽  
Greenhouse Gas Emission ◽  
Nitrogen Management ◽  
Split Application ◽  
Gas Emission ◽  
Nitrogenous Fertilizer ◽  
Coated Urea ◽  
Direct Seeded

A field experiment was conducted at research farm, Bihar Agricultural University, Sabour, India during 2017 and 2018 to gain insight crop phonology mediated greenhouse gas emission under different tillage and nitrogen management practices in direct seeded rice (DSR). The experiment was conducted in split plot design with two tillage viz. zero tillage (ZT) and conventional tillage (CT) as main plot and four nitrogen management practices viz. 100% nitrogen through neem coated urea (S1), SPAD based nitrogen management (S2), 75% through neem coated urea + 25% nitrogen through vermicompost, (S3) and ¼ nitrogen as basal and rest in equal three splits at 20, 40, 60 DAS (S4) as sub plot, in three replication. The highest yield (4.69 t ha-1), net return (Rs 46440 ha-1) and B:C ratio (1.44) were recorded from zero tilled DSR. Further, highest yield (4.82 t ha-1), net return (Rs 44880 ha-1) and B:C ratio (1.36) was obtained under split application of nitrogenous fertilizers among other subplot treatments. The range of methane (0.57- 1.47 mg m-2 hr-1) carbon dioxide (0.32- 0.61 mg m-2 hr-1)  and nitrous oxide (19.58- 38.79 µg m-2 hr-1) emission was recorded lowest in zero tilled plots and split application of nitrogenous fertilizer also emitted lowest values of 1.59 mg m-2 hr-1 methane, 0.86 mg m-2 hr-1 carbon dioxide and 46.76 µg m-2 hr-1 nitrous oxide at maximum tillering stage of crop growth. Moreover, methane and nitrous oxide emission was gradually decreased from maximum tillering to harvesting stage. Zero tilled DSR with split nitrogen fertilizer application ascribed lowest greenhouse gas intensity among the other crop establishment and nitrogen management options. Thus, zero tilled method of crop establishment with split application of nitrogenous fertilizer could be a remunerative and environmentally stable method for direct seeded rice cultivation.

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