scholarly journals Habitat of Spathoglottis plicata Bl in Forest of Kampung Woniki East Biak District, Biak Numfor Papua

2010 ◽  
Vol 7 (1) ◽  
Author(s):  
Yuliany Senga ◽  
C. Y. Hans Arwam ◽  
Nurhaida I. Sinaga
Keyword(s):  
Light Intensity ◽  
Cation Exchange ◽  
Carbon Content ◽  
Water Content ◽  
Air Temperature ◽  
Soil Ph ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Font Size ◽  
Plant Site

<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables /> <w:SnapToGridInCell /> <w:WrapTextWithPunct /> <w:UseAsianBreakRules /> <w:DontGrowAutofit /> <w:UseFELayout /> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <mce:style><! st1\:*{behavior:url(#ieooui) } --> <!--[endif]--> <span style="font-size: 10pt; font-family: &quot;Times New Roman&quot;;">The research was aimed to figure out the ecology aspects of terrestrial orcid </span><em><span style="font-size: 10pt; font-family: &quot;Times New Roman&quot;;">S. plicata </span></em><span style="font-size: 10pt; font-family: &quot;Times New Roman&quot;;">in natural forest around Kampung Wonoki, East Biak. The result showed that <em>S. plicata </em>Grow on latosol soil with is structure very from loamy clay to loamy, colour of soil red to dark brown. Soil water content between 42,9-56,2 %, soil pH 5,0-6,4, Cation Exchange Capacity (CEC) 6,20-20,30 meq/100 gram, Base Saturation 10,0-68,0 %. Carbon content 0,20-0,69 %, Nitrogen 0,02-0,09 %, Phospor 0,3-21,3 ppm, Potasium 0,00-1,17 meq/100 gram, Calsium 0,77-11,78 meq/100 gram, Magnesium 0,15-1,11 meq/100 gram, and Sodium 0,00-0,13 meg/100 gram. Air Temperature Around site of plant site 26,5-42,3 <sup>0</sup>C, Air Moisture 49,0-82,0 % and Light Intensity 119-1228 lux.</span>

scholarly journals Crop Response to Soil Acidity Factors in Ultisols and Oxisols in Puerto Rico. XII. Tomatoes

1969 ◽  
Vol 69 (3) ◽  
pp. 357-365
Author(s):  
Edmundo Rivera ◽  
José Rodríguez ◽  
Fernando Abruña
Keyword(s):  
Puerto Rico ◽  
Cation Exchange ◽  
Soil Ph ◽  
Cation Exchange Capacity ◽  
Soil Acidity ◽  
Exchange Capacity ◽  
Crop Response ◽  
Exchangeable Al

The effect of acidity factors of two Ultisols and one Oxisol on yield and foliar composition of tomatoes was determined. Yields were not markedly reduced by acidity in the Ultisols until pH dropped to around 4.6 with 45% Al saturation of the cation exchange capacity (CEC), and no yield was produced at about pH 4.1 and 80% Al saturation. In the Oxisol, tomato yields dropped steadily from 39.7 t/ha, when there was no exchangeable AI, to 17.5 t/ha at the highest level of acidity, pH 4.4 and 43% AI saturation. In all soils, yields were closely correlated with soil pH, exchangeable Al and Ca and Al/Ca.

scholarly journals Volume‐related quantification of organic carbon content and cation exchange capacity of macropore surfaces in Bt horizons

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Martin Leue ◽  
Daniel Uteau ◽  
Stephan Peth ◽  
Steffen Beck‐Broichsitter ◽  
Horst H. Gerke
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Carbon Content ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Organic Carbon Content

ETUDE SUR LA VALEUR DES CRITERES CHIMIQUES PROPOSES PAR LA COMMISSION PEDOLOGIQUE DU CANADA POUR LA CLASSIFICATION TAXONOMIQUE DES SOLS DU QUEBEC

1977 ◽  
Vol 57 (3) ◽  
pp. 233-247 ◽  
Author(s):  
ROGER W. BARIL ◽  
THI SEN TRAN
Keyword(s):  
Cation Exchange ◽  
Soil Ph ◽  
Classification System ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Taxonomic Classification ◽  
Single Test ◽  
Ph Dependent ◽  
Extractable Al

Correlations were made among chemical criteria used for taxonomic soil classificaton. The compared tests were: oxalate Δ (Fe + Al), pyrophosphate-extractable (Fe + Al), oxalate-extractable Al, pH-dependent cation exchange capacity (ΔCEC), ratios of pyrophosphate-extractable (Fe + Al) over clay or over dithionite-extractable (Fe + Al), and finally soil pH measured in 1 M NaF. Significant correlations were found among various measured parameters. However, no single test was found to be reliable as a single criterion when applied to the taxonomic classification of Quebec soils. The two chemical tests, pyrophosphate-extractable (Fe + Al) and its ratio over clay, combined with morphologic criteria appeared useful for classifying Quebec Podzols. A few soils, which presented discrepancies from chemical criteria were found difficult to classify, thus suggesting the possibility of establishing new sub-groups in the Canadain soil taxonomic classification system.

scholarly journals Influence of brick manufacturing on phosphorus and sulfur in different agro-ecological soils of Bangladesh

2017 ◽  
Vol 29 (2) ◽  
pp. 123-131
Author(s):  
Reshma Akter ◽  
Md Jamal Uddin ◽  
Md Faruque Hossain ◽  
Zakia Parveen
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Soil Ph ◽  
Cation Exchange Capacity ◽  
Clay Content ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Maximum Accumulation ◽  
Brick Kilns ◽  
Total P

A study was carried out to evaluate the effects of brick manufacturing on phosphorus (P) and sulfur (S) concentrations in soil and plant collected from different distances of brick kilns in four AEZs of Bangladesh. Forty eight composite soil samples (0 - 15 cm depth) were collected from 48 points in 12 different sites at 0 m, 300 m, 800 m and 1500 m from brick kilns, where most (site 2, site 3, site 5, site 6, site 7, site 9 and site 10) of the brick kilns used coal for brick burning purposes. Plant samples (rice straw and different vegetables) were also collected from the respective fields except 0 m distances. Significantly (p ? 0.05) lower organic matter, cation exchange capacity, clay content and soil pH were found at 0 m distances compared to other distances. Highest concentration of total P in soil were recorded at 0 m distances and these concentrations decreased with increasing distances from the brick kilns in most of the sites; whereas available P is significantly lower at 0 m distances than that of other distances. Total and available concentration of S in soil followed the trend 0 m>300 m>800 m>1500 m. Maximum accumulation of P (69.15 mg kg-1) and S (0.14%) in plant was found at 800 m away from the brick kiln.Bangladesh J. Sci. Res. 29(2): 123-131, December-2016

Soil pH and Cation Exchange Capacity Affects Sunflower Tolerance to Sulfentrazone

2004 ◽  
Vol 18 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Gregory W. Kerr ◽  
Phillip W. Stahlman ◽  
J. Anita Dille
Keyword(s):  
Cation Exchange ◽  
Soil Ph ◽  
Cation Exchange Capacity ◽  
Dry Matter ◽  
Exchange Capacity ◽  
Treated Soil ◽  
Sunflower Plant ◽  
Greenhouse Study ◽  
Leaf Chlorosis ◽  
Over Time

Effects of soil pH and cation exchange capacity (CEC) on sunflower tolerance to sulfentrazone were investigated in a greenhouse study. Variables were soil pH (7.0, 7.3, 7.5, and 7.8), soil CEC (8.2, 13.7, 18.4, and 23.3 cmol/kg), and sulfentrazone rate (0, 105, 158, and 184 g ai/ha). Sulfentrazone-induced leaf chlorosis was affected by soil pH at 12 d after planting (DAP), but plants recovered, and earlier differences were not visible 9 d later. At 12 DAP, leaf chlorosis was 3 or 4% more severe in soils with pH 7.3 or higher compared with soils with pH 7.0 when averaged over both sulfentrazone rate and soil CEC. Leaf chlorosis resulting from sulfentrazone rates of 105, 158, and 184 g/ha was 17, 25, and 35% less at 23 cmol/kg than at 8.2 cmol/kg, respectively. Differences in chlorosis among sulfentrazone rates were greatest in soil with low CEC and lessened as soil CEC increased. Plants regained normal color over time, and newly emerging leaves were not affected. However, plant dry weights were reduced when sulfentrazone rate was ≥158 g/ha. Averaged over sulfentrazone rate and soil pH, sunflower dry weights were less when soil CEC was 8.2 compared with a CEC of 13.7 cmol/kg or higher, indicating a greater response at low CEC. Sunflower plant dry matter was not different in sulfentrazone-treated soil with a CEC above 13.7 cmol/kg. At the ranges tested, soil CEC had a considerably greater effect than did pH on sunflower tolerance to sulfentrazone.

scholarly journals Estimation of cation-exchange capacity in routine soil testing

1986 ◽  
Vol 58 (1) ◽  
pp. 1-7
Author(s):  
Raina Niskanen ◽  
Antti Jaakkola
Keyword(s):  
Organic Carbon ◽  
Cation Exchange ◽  
Carbon Content ◽  
Cation Exchange Capacity ◽  
Ammonium Acetate ◽  
Exchange Capacity ◽  
Regression Equation ◽  
Soil Testing ◽  
Organic Carbon Content ◽  
Exchangeable Ca

The efficiency of the soil testing method used in Finland for predicting the effective cation-exchange capacity was studied in a material of 430 topsoil samples. The effective cation-exchange capacity was estimated 1) by summation of exchangeable Ca, Mg and acidity displaced by unbuffered 1 M KCI and 2) by summation of exchangeable Ca, Mg, K and Na displaced by neutral 1 M ammonium acetate and exchangeable acidity. In soil testing, Ca, Mg and K were extracted by acid ammonium acetate and soil pH measured in water-suspension. The estimates of the effective CEC were highly correlated and dependent on the clay and organic carbon content and pH(CaCl2) of the soil, the coefficient of multiple determination being over 80 %. Exchangeable Ca was the dominating cation. The proportion of Ca of the effective CEC was about 80 %. Acid ammonium acetate-extractable Ca together with pH(H2O) explained over 80 % of the variation in the effective CEC. For the whole material consisting of mineral soils with great variations in texture, organic carbon content and properties under evaluation, the regression equation predicting the effective CEC (KCI method) was CEC (mval/kg) = 309—56.8pH(H2O) + 0.085Ca(mg/l). Only 16 % of the estimates of the effective CEC calculated with this regression equation deviated more than 15 % from the measured values.

scholarly journals Soil Health Assessment of Two Regenerative Farming Practices on Sandy Soils

2019 ◽  
Vol 8 (4) ◽  
pp. 61
Author(s):  
Nan Xu ◽  
Jehangir H. Bhadha ◽  
Abul Rabbany ◽  
Stewart Swanson
Keyword(s):  
Cation Exchange ◽  
Soil Ph ◽  
Active Carbon ◽  
Cation Exchange Capacity ◽  
Soil Health ◽  
Sandy Soils ◽  
Exchange Capacity ◽  
Farming Practices ◽  
Cover Cropping ◽  
Water Holding

The addition of organic amendments and cover cropping on sandy soils are regenerative farming practices that can potentially enhance soil health. South Florida mineral soils present low soil quality due to their sandy texture and low organic matter (OM) content. Few studies have focused on evaluating the effects of farm-based management regenerative practices in this region. The objective of this study was to evaluate changes in soil properties associated with two regenerative farming practices - horse bedding application in combination with cover cropping (cowpea, Vigna unguiculata), compared to the practice of cover cropping only for two years. The soil quality indicators that were tested included soil pH, bulk density, water holding capacity, cation exchange capacity, OM, active carbon, soil protein and major nutrients (N, P, K). Results indicated no significant changes in soil pH, but a significant reduction in soil bulk density and a significant increase in maximum water holding capacity for both practices. Cation exchange capacity and the amounts of active carbon increased significantly after 1.5-year of the farming practices. Horse bedding application with cover cropping showed a significant 4% increase in OM during a short period. A significant increase in plant-available P was also observed under these two practices. Based on this study, horse bedding application as an organic amendment in conjunction with cover cropping provides an enhanced soil health effect compared to just cover cropping. As local growers explore farming option to improve soil health particularly during the fallow period using regenerative farming practices on sandy soils, these results will assist in their decision making.

Sustainable use of wetland soils in the eastern region of Uganda around Lake Victoria Basin

2011 ◽  
Vol 6 (3) ◽  
Author(s):  
J. Zake ◽  
J. Y. Z. Kitungulu ◽  
H. Busurwa ◽  
F. Kyewaze
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Soil Ph ◽  
Cation Exchange Capacity ◽  
Lake Victoria ◽  
Exchange Capacity ◽  
Buffering Capacity ◽  
Wetland Soils ◽  
Lake Victoria Basin ◽  
Eastern Uganda

Wetlands are not wastelands but wealth lands, which are widely distributed throughout Uganda currently covering 11% of the total land area. They are accessible to a large proportion of the population. As the country's population grows, people increasingly convert wetlands for other land uses such as farming, settlement among others thus making it difficult to enforce legislation for their protection, sustainable management and utilization. Their profound importance to both humans and wildlife calls for a concerted effort to ensure their sustainable utilization and attempts should be made to promote sustainable development of such wetlands with adequate considerations being given to human and environmental requirements. This study was therefore carried out to determine the effect of drainage on organic matter levels and on soil chemical changes in wetland soils in eastern Uganda around the Lake Victoria basin. Secondly, to assess potential lime requirements for drained wetland soils in eastern Uganda around the Lake Victoria basin, this would reflect on wetland soil buffering capacity. In green house studies it was found that drainage of wetland soils led to a reduction of organic matter relative to soil structure and where sulfur and iron were present in large amounts, drainage caused decrease in soil pH to moderately acidic levels; but in cases where exchangeable bases were present in large amounts there was an increase in soil pH. Lime requirements were greater where the amount of clay, organic matter and cation exchange capacity were high. Consequently, such wetland soils had a high buffering capacity. It was concluded that wetland soils should be characterized in terms of potential of acidification, level of organic matter, nutrient content, cation exchange capacity, soil texture and levels of trace elements. Decisions to drain or not to drain should depend on these parameters and other socio-economic considerations for the area.

Impacts of whole-tree harvesting and winter windrowing on soil pH and base status of clayey sites of northwestern Quebec

1995 ◽  
Vol 25 (6) ◽  
pp. 997-1007 ◽  
Author(s):  
S. Brais ◽  
C. Camiré ◽  
D. Paré
Keyword(s):  
Cation Exchange ◽  
Soil Ph ◽  
Forest Floor ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Exchangeable Ca ◽  
Whole Tree Harvesting ◽  
The Impact ◽  
Whole Tree ◽  
Tree Harvesting

To assess the impact of forest operations on soil nutrient status, modifications to forest floor, to 0–10 and 10–20 cm mineral soil base status, and to pH were evaluated 5–12 years following whole-tree harvesting and winter windrowing on dry to fresh and moist clayey sites in the clay belt region of northwestern Quebec. Whole-tree harvesting had few impacts on base concentrations and soil pH of dry to fresh sites. On moist sites, significant decreases in pH (−0.60 to −0.84 units), exchangeable Ca, total Ca, and, exchangeable Mg concentrations, base saturation, and effective cation exchange capacity were observed following harvesting. On dry to fresh sites, a decrease in the forest floor weight (−55%) accounted for significant reductions in exchangeable Ca (−55%), total Ca (−61%), and exchangeable K (−40%) pools in this layer, while reserves of both mineral layers were not affected. On moist sites, significant decreases in exchangeable Ca (−42 to −65%) and Mg (−35 to −56%) reserves occurred in all soil layers, while forest floor reserves of total Ca, Mg, and K decreased by 67, 48, and 40%, respectively. These reductions were caused by a loss of substrate in the forest floor (−44%) and a decrease in effective cation exchange capacity, exchangeable Ca saturation, and total Ca concentrations. Impacts of windrowing following whole-tree harvesting were limited to a reduction in reserves of exchangeable Ca (−22%), exchangeable Mg (−27%), total Ca (−20%), and total Mg (−29%) pools of the forest floor of moist sites. Values reported here are much greater than values generally predicted by a balance sheet approach and underline the need for more process-oriented studies. Impacts of these losses on long-term site productivity remain to be investigated.

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