Decomposition of humic acids by incubation in a soil water-extract under various conditions of oxygen availability

1987 ◽  
Vol 97 (1) ◽  
pp. 15-23 ◽  
Author(s):  
A. Ramunni ◽  
R. Scialdone ◽  
D. Felleca
Keyword(s):  
Soil Water ◽  
Humic Acids ◽  
Water Extract ◽  
Oxygen Availability ◽  
Soil Water Extract

Root Elongation Method for the Quality Assessment of Metal-Polluted Soils: Whole Soil or Soil-Water Extract?

2020 ◽  
Vol 20 (4) ◽  
pp. 2294-2303
Author(s):  
Eva V. Prudnikova ◽  
Alexander Neaman ◽  
Vera A. Terekhova ◽  
Mikhail M. Karpukhin ◽  
Evgenii L. Vorobeichik ◽  
...  
Keyword(s):  
Quality Assessment ◽  
Soil Water ◽  
Root Elongation ◽  
Water Extract ◽  
Polluted Soils ◽  
Elongation Method ◽  
Soil Water Extract

The influence of soil water extract and thiamine on the growth of Cladophora glomerata

1975 ◽  
Vol 53 (6) ◽  
pp. 530-535 ◽  
Author(s):  
Laurence F. Moore ◽  
Duncan A. McLarty
Keyword(s):  
Soil Water ◽  
Water Extract ◽  
Optimum Concentration ◽  
Laurentian Great Lakes ◽  
Cladophora Glomerata ◽  
Active Components ◽  
Two Samples ◽  
Soil Water Extract ◽  
Labile Component ◽  
Synthetic Media

Soil water extract (SWE) has been used for decades to supplement certain algal and fungal cultures, but its active components remain essentially unknown. Cladophora glomerata, an attached green alga which has become a problem in several of the Laurentian Great Lakes and elsewhere, is one species that grows well on synthetic media supplemented with SWE. Unialgal cultures were used to investigate the nature of the active components in SWE with the hope that insight of the nutritional requirements of this alga would be gained.Analysis of SWE showed that an organic heat-labile component was significant, and when thiamine was substituted for SWE, it was found to provide 80% of the stimulation induced by SWE. The presence of thiamine in two samples of SWE was verified, and concentrations of 3 and 10 μg/litre were determined using the Phycomyces bioassay. Subsequent investigations of the requirement of thiamine by C. glomerata demonstrated that 1 μg/litre, provided either by SWE or as the pure vitamin, stimulated satisfactory growth, while 10 μg/litre is the apparent optimum concentration.

Determination of fluoride in soil water extract by ion chromatography with column-switching technique

2016 ◽  
Vol 34 (4) ◽  
pp. 442
Author(s):  
Xinhua JIANG ◽  
Chengzhu NI ◽  
Binhe ZHU ◽  
Xunyan ZHAO ◽  
Suqing CHEN ◽  
...  
Keyword(s):  
Soil Water ◽  
Ion Chromatography ◽  
Water Extract ◽  
Column Switching ◽  
Soil Water Extract

Analysis of the 1:5 soil: water extract in burnt soils to evaluate fire severity

CATENA ◽  
2008 ◽  
Vol 74 (3) ◽  
pp. 246-255 ◽  
Author(s):  
J. Notario del Pino ◽  
I. Dorta Almenar ◽  
A. Rodríguez Rodríguez ◽  
C. Arbelo Rodríguez ◽  
F.J. Navarro Rivero ◽  
...  
Keyword(s):  
Soil Water ◽  
Fire Severity ◽  
Water Extract ◽  
Soil Water Extract

Conductivity of soil-water extract as an index of soil structure

1955 ◽  
Vol 6 (1) ◽  
pp. 84-91 ◽  
Author(s):  
J. S. Joffe ◽  
Jesse Elson
Keyword(s):  
Soil Water ◽  
Soil Structure ◽  
Water Extract ◽  
Soil Water Extract

Simplified Evaluation of Salt Affected Soils Using 1:5 Soil–Water Extract

2021 ◽  
pp. 1-17
Author(s):  
Tsuneyoshi Endo ◽  
Mubarak Abdelrahman Abdalla ◽  
Abdel Karim Hassan Awad Elkarim ◽  
Mayu Toyoda ◽  
Sadahiro Yamamoto ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Extract ◽  
Soil Water Extract ◽  
Salt Affected Soils

scholarly journals Determination of dissolved reactive and dissolved total phosphorus in water extract of soils

2011 ◽  
Vol 57 (No. 1) ◽  
pp. 1-6 ◽  
Author(s):  
J. Matula
Keyword(s):  
Agricultural Soils ◽  
Water Extract ◽  
Phosphorus Level ◽  
Total Water ◽  
Testing Laboratory ◽  
Molybdenum Blue ◽  
Dissolved Phosphorus ◽  
Soil Water Extract ◽  
Simplified Procedure

The simplified acid peroxydisulphate digestion of soil water extract was evaluated for determination of total dissolved phosphorus by molybdenum-blue colorimetry in comparison with direct P-detection in water extract by the ICP-AES technique. The research was conducted on 79 agricultural soils with different agrochemical characteristics. The results of the colorimetric P detection in water extract without digestion and ICP phosphorus detection were different. The median of values determined by ICP-AES was 1.7 times higher than that of colorimetry, but the correlations between the two measurements were quite close (r = 0.993). Differences between the colorimetric phosphorus and ICP-AES phosphorus were irregular, increasing as the phosphorus level in soils decreased. The simplified procedure of acid peroxydisulphate digestion is useful for routine determination of total water-extracted phosphorus in soils when the soil testing laboratory is not equipped with the ICP-AES technique. The two-tailed paired t-test did not prove any difference in the values between the direct ICP-AES P-detection in water extract of soils and colorimetric P-detection in the acid peroxydisulphate digest.  

scholarly journals Case Study on the Use of the Leaf-Count Method for Drip Fertigation in Outdoor Cucumber Cultivation in Reconstructed Fields Devastated by a Tsunami

Agriculture ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 656
Author(s):  
Yuki Tashiro ◽  
Tatsuo Sato ◽  
Junjira Satitmunnaithum ◽  
Hatsumi Kinouchi ◽  
Jianlin Li ◽  
...  
Keyword(s):  
Real Time ◽  
Water Extract ◽  
Test Site ◽  
Fertilizer Application ◽  
Tsunami Disaster ◽  
Soil Water Extract ◽  
Cucumber Yield ◽  
Iwate Prefecture ◽  
Drip Fertigation

Drip fertigation was tested in fields using a nitrogen fertilization method based on leaf increments, with the aim of increasing the cucumber yield in outdoor fields restored after the tsunami disaster in Rikuzentakata City, Iwate Prefecture, in 2011. The 2016 test site (Takata field) was restored as a paddy field, and there were problems with water retention and gravel contamination. The condition of the 2017 test site (Yonesaki field) was better than that of the 2016 site. The drip fertigation method increased cucumber yield by 93% and 27% in the Takata and Yonesaki fields, respectively, when compared to the yield from fields cultivated conventionally. Drip fertigation enables the constant supply of liquid fertilizer to the rhizosphere, and the easy application prevents the scarcity of fertilizer, especially at later stages of growth. In contrast, a real-time soil diagnosis, using the Dutch 1:2 soil–water extract method, was unsuccessful due to flooding, especially in the Takata field. As the purpose of this method is not to reduce the amount of nitrogen provided, but to increase the yield, and because it is difficult to precisely control the application of fertilizer due to precipitation, we suggest that the real-time soil diagnosis and feedback should be omitted to further simplify fertilizer application.

Seasonal variation of pH, aluminium, and manganese in acid soils from north-eastern Victoria

1992 ◽  
Vol 32 (8) ◽  
pp. 1105 ◽  
Author(s):  
WJ Slattery ◽  
GR Ronnfeldt
Keyword(s):  
Seasonal Variation ◽  
Water Extract ◽  
Acid Soils ◽  
Late Summer ◽  
Seasonal Effects ◽  
Laboratory Error ◽  
North Eastern ◽  
Soil Water Extract ◽  
Red Earth ◽  
Extractable Al

Seasonal variation in pH (measured in H2O or 0.01 mol CaCl2/L) and in Al and Mn extracted by 0.01 mol CaCl2/L are reported for north-eastern Victoria. Seasonal variation in pH(H2O) was significantly (P<0.05) greater than either the spatial variation or laboratory error. There was no significant (P<0.05) seasonal variation in pH(CaCl2). For pH (H2O), values were observed to increase after the autumn break, to peak at or near midwinter, and to decrease slowly over the spring and summer months to lowest values in late summer. Seasonal changes for pH(H2O) were significantly (P<0.05) related to the ionic strength of the 1 : 5 soil : water extract. Significant seasonal variations (P<0.05) occurred for extractable Al and Mn in a podsolised red earth and a red podsolic. Seasonal effects were a significant (P<0.05) source of variation for the methods used in this study and should, therefore, be considered in any comparative or predictive studies using these methods.

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