Analysis of Ammonia Volatilization Loss from a Paddy Soil With Empirical and Mechanistic Models

2021 ◽  
pp. 2000230
Author(s):  
Wen‐Ming Xie ◽  
Pei‐Kun Yuan ◽  
You Ma ◽  
Wei‐Ming Shi ◽  
Hai‐Lin Zhang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Mechanistic Models ◽  
Empirical And Mechanistic Models

Effect of biofertilizer and wheat straw biochar application on nitrous oxide emission and ammonia volatilization from paddy soil

2021 ◽  
Vol 275 ◽  
pp. 116640
Author(s):  
Haijun Sun ◽  
Yu Zhang ◽  
Yiting Yang ◽  
Yudong Chen ◽  
Paramsothy Jeyakumar ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Wheat Straw ◽  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Nitrous Oxide Emission

Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models

2011 ◽  
Vol 91 (2) ◽  
pp. 305-321 ◽  
Author(s):  
Aklilu Alemu ◽  
K. H. Ominski ◽  
E. Kebreab
Keyword(s):  
Beef Cattle ◽  
Methane Emissions ◽  
Mechanistic Models ◽  
Tier 2 ◽  
Cattle Population ◽  
Production Environment ◽  
Feed Composition ◽  
Enteric Methane ◽  
Empirical And Mechanistic Models ◽  
Enteric Methane Emissions

Alemu, A. W., Ominski, K. H. and Kebreab, E. 2011. Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models. Can. J. Anim. Sci. 91: 305–321. The objective of this study was to estimate and assess trends in enteric methane (CH4) emissions from the Manitoba beef cattle population from the base year of 1990 to 2008 using mathematical models. Two empirical (statistical) models: Intergovernmental Panel on Climate Change (IPCC) Tier 2 and a nonlinear equation (Ellis), and two dynamic mechanistic models: MOLLY (v3) and COWPOLL were used. Beef cattle in Manitoba were categorized in to 29 distinct subcategories based on management practice, physiological status, gender, age and production environment. Data on animal performance, feeding and management practices and feed composition were collected from the literature as well as from provincial and national sources. Estimates of total enteric CH4 production from the Manitoba beef cattle population varied between 0.9 and 2.4 Mt CO2 eq. from 1990 to 2008. Regardless of the type of models used, average CH4 emissions for 2008 were estimated to be 45.2% higher than 1990 levels. More specifically, CH4 emissions tended to increase between 1990 and 1996. Emissions were relatively stable between 1996 and 2002, increased between 2003 and 2005, but declined by 13.2% between 2005 and 2008, following the same trend as that observed in the beef cattle population. Models varied in their estimates of CH4 conversion rate (Ym, percent gross energy intake), emission factor (kg CH4 head−1 yr−1) and CH4 production. Total CH4 production estimates ranged from 1.2 to 2.0 Mt CO2 eq. for IPCC Tier 2, from 0.9 to 1.5 Mt CO2 eq. for Ellis, from 1.3 to 2.1 Mt CO2 eq. for COWPOLL and from 1.5 to 2.4 Mt CO2 eq. for MOLLY. The results indicate that enteric CH4 estimates and emission trends in Manitoba were influenced by the type of model and beef cattle population. As such, it is necessary to use appropriate models for reliable estimates for enteric CH4 inventory. A more robust approach may be to integrate different models by using mechanistic models to estimate regional Ym values, which may then be used as input for the IPCC Tier 2 model.

Bentonite hydrochar composites mitigate ammonia volatilization from paddy soil and improve nitrogen use efficiency

2020 ◽  
Vol 718 ◽  
pp. 137301 ◽  
Author(s):  
Qingnan Chu ◽  
Sheng Xu ◽  
Lihong Xue ◽  
Yang Liu ◽  
Yanfang Feng ◽  
...  
Keyword(s):  
Nitrogen Use Efficiency ◽  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Nitrogen Use ◽  
Use Efficiency

scholarly journals The effects of the depth of fertilization on losses of nitrogen and phosphorus and soil fertility in the red paddy soil of China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11347
Author(s):  
Kun Hou ◽  
Ying Huang ◽  
Xiangmin Rong ◽  
Jianwei Peng ◽  
Chang Tian ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Soil Column ◽  
Nitrogen And Phosphorus ◽  
Total N ◽  
Optimal Depth ◽  
Significant Difference ◽  
Research Objects ◽  
Minimal Environmental Impact ◽  
Red Paddy Soil

Nitrogen (N) and phosphorus (P) losses from agroecosystems are dominant nonpoint pollution. To minimize the losses of N and P, the optimal depth of fertilization was explored using a soil column study with the red paddy soil as the research objects. The losses of N and P were measured under five depths of fertilization (0, 5, 7.5, 10, and 12.5 cm) as well as no fertilization. The results showed that ammonia volatilization was significantly decreased with increasing fertilization depth within 0–10 cm, and there was no significant difference among the 10 cm, 12.5 cm, and no-fertilization treatments. Comparing with surface fertilization (0 cm), N and P losses by runoff could be reduced by 30.7–67.1% and 96.9–98.7% respectively by fertilization at 5–12.5 cm. In addition, deep fertilization (5–12.5 cm) did not increase N and P losses by leaching at the depth of 40 cm. Total N and P contents in the tillage layer of soil were increased by 5.1 to 22.8% and by −1.0 to 7.5%, respectively. Fertilization at 10cm depth has the potential to minimal environmental impact in the red paddy soil of south China, at this depth, NH3 volatilization was reduced by 95.1%, and N and P losses by runoff were reduced by 62.0% and 98.4%, respectively, compared with surface fertilization.

Responses of ammonia volatilization from rice paddy soil to application of wood vinegar alone or combined with biochar

Chemosphere ◽  
2020 ◽  
Vol 242 ◽  
pp. 125247 ◽  
Author(s):  
Haijun Sun ◽  
Yanfang Feng ◽  
Lihong Xue ◽  
Sanchita Mandal ◽  
Hailong Wang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Rice Paddy ◽  
Rice Paddy Soil ◽  
Wood Vinegar
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