scholarly journals Equifinality in the modelling of ammonia volatilisation from a flooded rice system

2020 ◽  
Vol 133 ◽  
pp. 104752
Author(s):  
Khairudin Nurulhuda ◽  
Mohamad Pauzi Zakaria ◽  
Paul C. Struik ◽  
Karel J. Keesman
Keyword(s):  
Flooded Rice ◽  
Ammonia Volatilisation

Simulating the effectiveness of surface film on water evaporation and ammonia volatilisation

Soil Research ◽  
2002 ◽  
Vol 40 (7) ◽  
pp. 1243 ◽  
Author(s):  
S. Y. Zhuang ◽  
B. Yin ◽  
Z. L. Zhu
Keyword(s):  
Half Life ◽  
Surface Film ◽  
Logistic Equation ◽  
Water Evaporation ◽  
Surface Films ◽  
Nitrogen Use ◽  
Flooded Rice ◽  
Use Efficiency ◽  
Ammonia Volatilisation ◽  
Effective Life

The application of surface films to flooded rice fields is one of the most effective measures of controlling ammonia volatilisation for improving nitrogen use efficiency. The feasibility of using a surface film is determined to some extent by the longevity of the effectiveness and this has never been estimated accurately in the field. The concept of half-life was introduced to estimate the effective life of a surface film by calculation from its effect on water evaporation. A simple laboratory experiment was carried out to validate the usefulness of the half-life concept. The results showed that effects on ammonia volatilisation could be quantified using a logistic equation based on the half-life concept.

Composition of weed communities in seasonally flooded rice environments in East Africa is determined by altitude

2021 ◽  
Vol 140 ◽  
pp. 143-152
Author(s):  
Runyambo Irakiza ◽  
Derek W. Makokha ◽  
Itambo Malombe ◽  
Thomas Le Bourgeois ◽  
Alfred. K. Chitiki ◽  
...  
Keyword(s):  
East Africa ◽  
Flooded Rice ◽  
Weed Communities ◽  
Seasonally Flooded

scholarly journals Ammonia volatilisation from grazed, pasture based dairy farming systems

2021 ◽  
Vol 190 ◽  
pp. 103119
Author(s):  
Andrew P. Smith ◽  
Karen M. Christie ◽  
Matthew T. Harrison ◽  
Richard J. Eckard
Keyword(s):  
Farming Systems ◽  
Dairy Farming ◽  
Grazed Pasture ◽  
Ammonia Volatilisation

scholarly journals Growth and physiological performance responses to drought stress under non-flooded rice cultivation with straw mulching

2010 ◽  
Vol 56 (No. 2) ◽  
pp. 51-59 ◽  
Author(s):  
J. Qin ◽  
X. Wang ◽  
F. Hu ◽  
H. Li
Keyword(s):  
Flag Leaf ◽  
Early Period ◽  
Grain Filling ◽  
Antioxidant Enzyme Activity ◽  
Straw Mulching ◽  
Flooded Rice ◽  
Significant Difference ◽  
Rice Yields ◽  
Change Tendency ◽  
Soil Moisture Status

A field experiment was performed to investigate the growth performance and the growth stage-dependent changes in activities of antioxidative enzymes and concentration of malondialdehyde (MDA) in leaves of rice subjected to treatment with (NF-M) or without straw mulching (NF-WM) under non-flooded conditions compared with continuously flooded treatment (CF). Compared with the NF-WM treatment, mulch application significantly increased the flag leaf area per plant before heading, tillers number and plant height at the early period of tillering stage. There was no significant difference between the yield of the NF-WM and CF treatment. However, the yield of NF-WM treatment was significantly lower than CF and NF-M treatments. Significantly higher activities of peroxidase (POD) and catalase (CAT) but lower concentration of superoxide dismutase (SOD) and malondialdehyde (MDA) were observed in straw mulching treatment than in treatment without mulching at elongation, heading and grain filling stages. The change tendency of antioxidant enzyme activity and MDA level was in line both with soil moisture status and rice yields of different treatments.

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