scholarly journals Soil carbon budget in a single-cropping paddy field with rice straw application and water management based on soil redox potential

2007 ◽  
Vol 53 (5) ◽  
pp. 657-667 ◽  
Author(s):  
Kazunori Minamikawa ◽  
Naoki Sakai
Keyword(s):  
Water Management ◽  
Redox Potential ◽  
Soil Carbon ◽  
Rice Straw ◽  
Paddy Field ◽  
Carbon Budget ◽  
Soil Redox Potential ◽  
Soil Redox ◽  
Straw Application

scholarly journals IRON DYNAMICS AND ITS RELATION TO SOIL REDOX POTENTIAL AND PLANT GROWTH IN ACID SULPHATE SOIL OF SOUTH KALIMANTAN, INDONESIA

2017 ◽  
Vol 17 (1) ◽  
pp. 1 ◽  
Author(s):  
Wahida Annisa ◽  
Dedy Nursyamsi
Keyword(s):  
Organic Matter ◽  
Plant Growth ◽  
Redox Potential ◽  
Rice Straw ◽  
Ferrous Iron ◽  
Block Design ◽  
Soil Redox Potential ◽  
Soil Redox ◽  
Acid Sulphate Soil ◽  
Acid Sulphate

<p>Organic matter has a function to maintain reductive conditions and to chelate toxic elements in acid sulphate soils. The study aimed to assess the dynamics of ferrous iron (Fe2+) in acid sulphate soil and its correlation with soil redox potential (Eh) and plant growth. The experiment was arranged in two factorial randomized block design with three replications. The first factor was two types of organic matter: (1) control (without organic matter), (2) rice straw and (3) rush weed (Eleocharis dulcis). The second factor was time of decomposition of organic matter: I1 = 2 weeks, I2 = 4 weeks, I3 = 8 weeks, and I4 = 12 weeks (farmer practice). The results showed that concentration of ferrous iron in the soil ranged from 782 to 1308 mg kg-1 during the rice growing season. The highest constant rate of iron reduction (k F2+) was observed on application of rice straw and rush weed with decomposition time of 8 weeks with the k Fe2+ value of 0.016 and 0.011 per day, respectively, while the ferrous iron formation without organic matter had the k Fe2+ value of 0.077 per day. The ferric iron (Fe3+) reduction served as a function of soil Eh as indicated by the negative correlation of ferrous iron and Eh (r = -0.856*). Organic matter decreased exchangeable iron due to chelating reaction. Iron concentration in roots was negatively correlated with soil soluble iron (r = -0.62*). Application of rice straw decomposed for 8 weeks increased the height of rice plant up to 105.67 cm. The score of Fe2+ toxicity at 8 weeks after planting ranged from 2 to 3, so rice crop did not show iron toxicity symptoms. </p>

Environmental controls in Pacific Northwest intertidal marsh plant communities

1983 ◽  
Vol 61 (4) ◽  
pp. 1105-1116 ◽  
Author(s):  
Kern Ewing
Keyword(s):  
Redox Potential ◽  
Pacific Northwest ◽  
Soil Texture ◽  
Puget Sound ◽  
Principal Component ◽  
Organic Content ◽  
Mode Analysis ◽  
Soil Redox Potential ◽  
Soil Redox ◽  
Environmental Controls

Relationships between environmental variables and species distribution were studied in a brackish intertidal marsh formed by the Skagit River as it enters the Puget Sound bay system in Washington. Transects were established which covered the range of environmental variation in the marsh. A grid of environmental measuring stations provided information on soil texture, organic content of soil fines, macroorganic material in the soil, soil temperatures, interstitial soil water salinity, soil redox potential, and site elevation. Binary discriminant analysis, a nonparametric method using species presence–absence data, was used to construct standardized residual matrices. Principal component analysis of standardized residuals (Q mode) indicated that salinity and soil texture were strongly correlated with the first factor generated, elevation with the second, and soil redox potential with the third. The factors explained, respectively, 48, 21, and 14% of the variance in the residuals matrix. From R-mode analysis, eight community types were derived: three dominated by Carex lyngbyei, two by Scirpus americanus, one by Scirpus maritimus, and two which are highly diverse.

Soil redox potential in small pondcypress swamps after harvesting

1998 ◽  
Vol 112 (3) ◽  
pp. 281-287 ◽  
Author(s):  
William P. Casey ◽  
Katherine C. Ewel
Keyword(s):  
Redox Potential ◽  
Soil Redox Potential ◽  
Soil Redox
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