GYPSUM AMENDMENT AND EXCHANGEABLE CALCIUM AND MAGNESIUM EFFECTS ON PLANT NUTRITION UNDER CONDITIONS OF INTENSIVE NUTRIENT EXTRACTION

Soil Science ◽  
2008 ◽  
Vol 173 (2) ◽  
pp. 108-118 ◽  
Author(s):  
Nerilde Favaretto ◽  
L. Darrell Norton ◽  
Sylvie M. Brouder ◽  
Brad C. Joern
Keyword(s):  
Plant Nutrition ◽  
Exchangeable Calcium ◽  
Calcium And Magnesium ◽  
Nutrient Extraction ◽  
Magnesium Effects

Measuring Calcium and Magnesium Contents on the Sludge Composting with Different Treatments

2012 ◽  
Vol 518-523 ◽  
pp. 3150-3154
Author(s):  
Jian She Yang ◽  
Ying Ding
Keyword(s):  
Ammonium Acetate ◽  
Single Treatment ◽  
Edta Complex ◽  
Exchangeable Calcium ◽  
Exchangeable Ca ◽  
Exchangeable Magnesium ◽  
Calcium And Magnesium ◽  
Sludge Composting

Abstract: Calcium and magnesium contents of sludge composting are measured by using the method of ammonium acetate-EDTA complex metric titration here, through Fermentation accelerant and increased nutrient agent treatments. The results showed as following: 1, exchangeable Ca and Mg contents of sludge single treatment increased more 6.83% and5.12% at the end of composting, than at the beginning of composting. 2, Fermentation accelerant added in sludge from 8% to 40%,，the exchangeable calcium and magnesium are more 4.38% ~ 10.58% and 6.77% ~ 13.78% at the end of composting than at the beginning of composting. The exchangeable Ca increased 19.51% ~ 104.83%, but 6.05% of a decreased trend for exchangeable magnesium, Compared with the sludge single compost. 3, as increasing the amount of nutrient agent from 30% to 50%, the exchangeable calcium and magnesium are more 3.88%~7.75%and 5.24%~9.18% at the end of composting than at the beginning of composting. The exchangeable Ca increased in 11.35%~41.13%,but 49%~-3.96% of a decreased trend for exchangeable magnesium, Compared with the sludge single compost. 4, under the condition added 24% of the Fermentation accelerant agent to the sludge, as the Increased nutrient agents from 8% to 32%, the exchangeable calcium and magnesium measured are increased 2.63%~5.54%and3.6%~4.19% at the end of composting , compared with The beginning of composting. The exchangeable Ca increased in 52.34%~112.04%,but -10.15%~-15.59% for exchangeable magnesium, Compared with the sludge single compost.

scholarly journals Relationship between macrofauna, mineralogy and exchangeable calcium and magnesium in Cerrado Oxisols under pasture

2009 ◽  
Vol 44 (8) ◽  
pp. 996-1001 ◽  
Author(s):  
Pedro Rodolfo Siqueira Vendrame ◽  
Robélio Leandro Marchão ◽  
Osmar Rodrigues Brito ◽  
Maria de Fátima Guimarães ◽  
Thierry Becquer
Keyword(s):  
Total Carbon ◽  
Soil Macrofauna ◽  
Exchangeable Calcium ◽  
Exchangeable Ca ◽  
Calcium Magnesium ◽  
Distrito Federal ◽  
Calcium And Magnesium ◽  
Taxonomic Groups ◽  
The Relationship ◽  
Soil Groups

The objective of this work was to assess the relationship between macrofauna, mineralogy and exchangeable calcium and magnesium in Cerrado Oxisols under pasture. Twelve collection points were chosen in the Distrito Federal and in Formosa municipality, Goiás state, Brazil, representing four soil groups with varied levels of calcium + magnesium and kaolinite/(kaolinite + gibbsite) ratios. Soil macrofauna was collected in triplicate at each collection point, and identified at the level of taxonomic groups. Macrofauna density showed correlation with contents of kaolinite, gibbsite and exchangeable Ca + Mg in the soils. Mineralogy and exchangeable Ca + Mg had significant effects on taxonomic groups and relative density of soil macrofauna. The termites (Isoptera) were more abundant in soils with low exchangeable Ca + Mg; earthworms (Oligochaeta), in soils with high levels of kaolinite; and Hemiptera and Coleoptera larvae were more abundant in gibbsitic soils with higher contents of total carbon.

Determining optimal digital soil mapping components for exchangeable calcium and magnesium across a sugarcane field

CATENA ◽  
2019 ◽  
Vol 181 ◽  
pp. 104054 ◽  
Author(s):  
Nan Li ◽  
Maryem Arshad ◽  
Dongxue Zhao ◽  
Michael Sefton ◽  
John Triantafilis
Keyword(s):  
Soil Mapping ◽  
Digital Soil Mapping ◽  
Exchangeable Calcium ◽  
Sugarcane Field ◽  
Calcium And Magnesium

Exchangeable calcium, magnesium and sodium and the dispersion of illites in water. II. Dispersion of illites in water

Soil Research ◽  
1977 ◽  
Vol 15 (3) ◽  
pp. 255 ◽  
Author(s):  
WW Emerson ◽  
CL Chi
Keyword(s):  
Water Content ◽  
Particle Aggregation ◽  
The Other ◽  
Clay Particles ◽  
Exchangeable Calcium ◽  
Soil Clays ◽  
Exchangeable Magnesium ◽  
Calcium Magnesium ◽  
Calcium And Magnesium ◽  
Dominant Cation

Samples of illites, two extracted from soils, one from a shale, prepared with a range of exchangeable calcium, magnesium, sodium were immersed dry into water. The extent of dispersion with time was estimated visually and also deduced from the O.D. of the suspensions derived from the dispersed clay. The dispersion of wet calcium and magnesium soil illites sheared at a given water content and then immersed in water was also assessed visually. The dispersion of all three illites was enhanced when magnesium was the dominant cation rather than calcium. For the soil clays a lower ESP was required to initiate dispersion of the dry clay when immersed in water. Both calcium and magnesium forms of the shale illite dispersed partially over a period of several days when immersed dry into water, the magnesium to a greater extent than calcium. The magnesium form of the coarser of the two soil illites also dispersed slowly. By comparing the calcium-magnesium and calcium-sodium forms of the last clay, it was deduced that about 10 times the equivalent concentration of exchangeable magnesium as sodium was needed to cause the same degree of dispersion. For the other soil illite the water content for dispersion of the wet, sheared magnesium clay was found to be less than for the calcium clay. The O.D. of suspensions of the clays was found to decrease with increasing ESP and when magnesium was the dominant cation rather than calcium. This is explained in terms of particle aggregation. The ease of dispersion of the illites was correlated with particle size. Possible reasons for this, and the effect of magnesium, as opposed to calcium, on the forces between the clay particles are discussed.

Calcium and Magnesium Effects on Ammonia Adsorption by Soil Clays

2005 ◽  
Vol 69 (4) ◽  
pp. 1225-1232 ◽  
Author(s):  
Katerina M. Dontsova ◽  
L. Darrell Norton ◽  
Cliff T. Johnston
Keyword(s):  
Ammonia Adsorption ◽  
Soil Clays ◽  
Calcium And Magnesium ◽  
Magnesium Effects

scholarly journals Exchangeable Calcium and Magnesium of Soils in Tyosen. IV

1940 ◽  
Vol 16 (10) ◽  
pp. 939-948
Author(s):  
HIDEO MISU
Keyword(s):  
Exchangeable Calcium ◽  
Calcium And Magnesium

Landscape Determinants of Exchangeable Calcium and Magnesium in Ozark Highland Forest Soils

2011 ◽  
Vol 75 (1) ◽  
pp. 164-180 ◽  
Author(s):  
John M. Kabrick ◽  
Keith W. Goyne ◽  
Zhaofei Fan ◽  
Dennis Meinert
Keyword(s):  
Forest Soils ◽  
Exchangeable Calcium ◽  
Calcium And Magnesium

Flame Photometric Determination of Exchangeable Calcium and Magnesium in Soils

1956 ◽  
Vol 20 (3) ◽  
pp. 328-333 ◽  
Author(s):  
W. M. Shaw ◽  
N. Claire Veal
Keyword(s):  
Photometric Determination ◽  
Exchangeable Calcium ◽  
Calcium And Magnesium
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