Nitrogen mineralization in paddy soils of the Taihu Region of China under anaerobic conditions: dynamics and model fitting

Geoderma ◽  
2003 ◽  
Vol 115 (3-4) ◽  
pp. 161-175 ◽  
Author(s):  
Huilin Li ◽  
Yong Han ◽  
Zucong Cai
Keyword(s):  
Nitrogen Mineralization ◽  
Model Fitting ◽  
Paddy Soils ◽  
Anaerobic Conditions

scholarly journals Nitrogen mineralization and phosphorus solubilization due to rewetting of forest and paddy soils

2010 ◽  
pp. 72-91
Author(s):  
Marco Rodel Aragon ◽  
Victor Asio
Keyword(s):  
Nitrogen Mineralization ◽  
N Mineralization ◽  
Paddy Soils ◽  
Available P ◽  
Total N ◽  
Phosphorus Solubilization ◽  
P Solubilization ◽  
Drying And Rewetting ◽  
Extractable P ◽  
Water Extractable

Rewetting of soils may cause an increase in phosphorus solubilization and nitrogen mineralization resulting in the release of bioavailable phosphates and nitrates which are vital for crop growth but are also associated with eutrophication of surface waters. The study was conducted to evaluate P solubilization and N mineralization due to drying and rewetting of forest and paddy soils under laboratory conditions. Forest and paddy soils were tested for water extractable P and mineralizable N (NH4+ and NO3–) after being subjected to drying and rewetting cycles for 7 and 14 days of drying. Soil samples were also analyzed for pH, OM, total N, total P, available P, and clay contents. Results indicated a significant increase in water-extractable P and total mineralized N for all the samples tested. N mineralization and P solubilization were correlated with OM, total N, available P, and clay. Findings also revealed that NH4+ concentration increased while that of NO3– decreased significantly for all the samples tested. The amounts of water-extractable P and NO3– released due to rewetting could potentially accelerate eutrophication if transported to bodies of water. They could also however benefit the growing plant.

scholarly journals Examination of Innovative High-Throughput Fermentations

2017 ◽  
Vol 45 (2) ◽  
pp. 19-21 ◽  
Author(s):  
Áron Németh
Keyword(s):  
Growth Curve ◽  
Model Fitting ◽  
Strain Improvement ◽  
Accurate Method ◽  
Measured Data ◽  
Anaerobic Conditions ◽  
Online Measurements ◽  
New Instruments ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

Abstract During the investigation of fermentations, issues such as the need for numerous parallel experiments with regard to strain improvement or screening were often met, or in the case of media optimization the need for online measurements to avoid a lack of night-samples was also required. Therefore, several new instruments were introduced to solve one or more of these problems: impedimetric- and reverse-spin-technologies (RST) were compared via fermentation of a well-known species of yeast, Saccharomyces cerevisiae, under both aerobic and anaerobic conditions, resulting in a diauxic growth curve. To identify the most accurate method, a wellknown mathematical description was fitted to the measured data. Since the initial parameters were considered reliable as they originated from real experiments, during model fitting, the parameters were further fine-tuned, and the less modifications reported the better the system since it produces a growth curve that is more similar to standard bioreactors. According to our study, the impedimetric equipment was more efficient, and could run 40 parallel experiments, but the RST was more flexible.

Soil nitrogen mineralization during laboratory incubation: Dynamics and model fitting

1996 ◽  
Vol 28 (4-5) ◽  
pp. 625-632 ◽  
Author(s):  
Zhengxia Dou ◽  
John D. Toth ◽  
Jalal D. Jabro ◽  
Richard H. Fox ◽  
Daniel D. Fritton
Keyword(s):  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Model Fitting ◽  
Soil Nitrogen Mineralization ◽  
Laboratory Incubation
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