The annual pattern of potassium release from organic matter in sandy soils of south-west Australia

Soil Research ◽  
1968 ◽  
Vol 6 (2) ◽  
pp. 193 ◽  
Author(s):  
FJ Roberts
Keyword(s):  
Organic Matter ◽  
Plant Uptake ◽  
Microbial Population ◽  
Sandy Soils ◽  
Early Winter ◽  
Exchangeable Potassium ◽  
Field Sampling ◽  
Summer Period ◽  
Potassium Release ◽  
South West

Regular field sampling of the 0-3 in. horizon of a sandy soil disclosed an annual pattern of potassium release from the organic matter fraction and retention by the microbial population. The exchangeable + soil-solution potassium content KE+S reached a maximum in autumn (March) at a time when microbial potassium KM and non-exchangeable potassium associated with organic matter KOM were at minimum levels. In soils containing 4% or more of organic matter the KM and KOM categories were important sources of supply of potassium entering the KE+S form. Release of potassium was rapid at temperatures of 40�C and above, but was much slower at lower temperatures. Temperatures in the surface horizon of soils in parts of south-west Australia often exceeded 40�C during the summer period; at these temperatures release occurred more readily in wet soils than in dry soils. Two slight peaks in microbial retention of potassium occurred during early winter (April-May) and spring (October-November). The significance of the observed fluctuations is discussed in relation to leaching and plant uptake of potassium.

14C and δ13C characteristics of organic matter and carbonate in saltmarsh sediments from south west Scotland

2004 ◽  
Vol 6 (5) ◽  
pp. 441-447 ◽  
Author(s):  
A. B. MacKenzie ◽  
G. T. Cook ◽  
J Barth ◽  
P Gulliver ◽  
P McDonald
Keyword(s):  
Organic Matter ◽  
South West

Organic matter fractions and N mineralization in vegetable-cropped sandy soils

2013 ◽  
Vol 29 (3) ◽  
pp. 333-343 ◽  
Author(s):  
K. Jegajeevagan ◽  
S. Sleutel ◽  
N. Ameloot ◽  
M. A. Kader ◽  
S. De Neve
Keyword(s):  
Organic Matter ◽  
N Mineralization ◽  
Sandy Soils ◽  
Organic Matter Fractions

Habitat requirements and distribution of Engaeus cisternarius and three subspecies of Parastacoides tasmanicus (Decapoda : Parastacidae), burrowing crayfish from an area of south-western Tasmania

1980 ◽  
Vol 31 (4) ◽  
pp. 475 ◽  
Author(s):  
AMM Richardson ◽  
R Swain
Keyword(s):  
Small Area ◽  
Habitat Preferences ◽  
Sandy Soils ◽  
Taxonomic Status ◽  
River Valley ◽  
Habitat Requirements ◽  
Intensive Study ◽  
Extensive Survey ◽  
South West ◽  
Waterlogged Soils

During an extensive survey of the crayfish fauna of the lower catchments of the Gordon River, south-western Tasmania. two species of crayfish were collected: Engaeus cisternarius and three subspecies of Parastacoides tasmanicus (P. t. tasmanicus, P. t. inermis and P. t. insignis). From this survey and an intensive study in a small area of the Olga River valley, distinct habitat preferences of each of the forms were recognized. E. cisteinavius was restricted to the areas north and west of the Gordon River where it was found only in clay and sandy soils under rainforest. P. t. tasmanicus was found in waterlogged soils, peats and sands on valley floors covered either with wet sedgeland or rainforest. P. t. inermis was found in two disjunct habitats: well- drained slopes and hillsides covered in heath vegetation. and under rocks in small creeks in rainforests. P. t. insignis occupied an intermediate habitat between P. t. tasmanicus and the non-creek dwelling, P. t. inermis, but was restricted geographically to the extreme south-west of the study area. The taxonomic status of the P. tasmanicus subspecies is discussed.

Organic Matter Fractions Controlling Soil Water Repellency in Sandy Soils From the Doñana National Park (Southwestern Spain)

2014 ◽  
Vol 27 (5) ◽  
pp. 1413-1423 ◽  
Author(s):  
Nicasio T. Jiménez‐Morillo ◽  
José A. González‐Pérez ◽  
Antonio Jordán ◽  
Lorena M. Zavala ◽  
José María Rosa ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Water ◽  
National Park ◽  
Sandy Soils ◽  
Water Repellency ◽  
Soil Water Repellency ◽  
Doñana National Park ◽  
Organic Matter Fractions

scholarly journals Nitrogen mineralization and microbial activity as influenced by sulfur sources in an alkaline calcareous soil

1970 ◽  
pp. 14-18
Author(s):  
Tufail Shah ◽  
Zahir Shah ◽  
Syed Atizaz Ali Shah ◽  
Nazir Ahmad
Keyword(s):  
Organic Matter ◽  
Sulfuric Acid ◽  
Microbial Activity ◽  
Calcareous Soil ◽  
Bacterial Population ◽  
Elemental Sulfur ◽  
Microbial Population ◽  
Organic Matter Content ◽  
Matter Content ◽  
Fungal Population

A study was performed to check the effects of various sources of sulfur on microbial activity, microbial population, N mineralization and organic matter content in an alkaline calcareous soil by using soil samples collected from Malakandher Farm at 0-20 cm depth, and analyzed for microbial activity, total mineral nitrogen, bacterial and fungal population and organic matter content. The results showed that the rate of CO2 evolution and cumulative CO2 production were higher in soils amended with elemental sulfur followed by sulfuric acid and gypsum treated soils. The microbial activity decreased with incubation period in all treatments, and the microbial population was greatly affected by sulfur sources. Generally, the bacterial population decreased in soils amended with elemental sulfur, but the population was higher in soils amended with gypsum. Bacterial population was suppressed in soils treated with sulfuric acid. However, the fungal population was higher in soils amended with sulfuric acids was less in soil amended with elemental sulfur. The sulfur amendments promoted immobilization of N. The net N immobilized was higher in soil amended with gypsum followed by soils amended with sulfuric acid and elemental sulfur. The percent organic matter was higher in soils amended with gypsum and was decreased compared with that amended with elemental sulfur or sulfuric acid. These results suggested that soil microbiological properties changed with sulfur amendments during laboratory incubation.

scholarly journals Effect of Dried Leaves of Leucaena leucocephala on Rumen Fermentation, Rumen Microbial Population, and Enteric Methane Production in Crossbred Heifers

Animals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 300 ◽  
Author(s):  
María Denisse Montoya-Flores ◽  
Isabel Cristina Molina-Botero ◽  
Jacobo Arango ◽  
José Luis Romano-Muñoz ◽  
Francisco Javier Solorio-Sánchez ◽  
...  
Keyword(s):  
Organic Matter ◽  
Leucaena Leucocephala ◽  
Volatile Fatty Acids ◽  
Microbial Population ◽  
Nutrient Digestibility ◽  
Neutral Detergent Fiber ◽  
Daily Production ◽  
Enteric Methane ◽  
Four Levels ◽  
Fermentation Parameters

The effects of dietary inclusion of dried Leucaena leucocephala leaves (DLL) on nutrient digestibility, fermentation parameters, microbial rumen population, and production of enteric methane (CH4) in crossbred heifers were evaluated. Four heifers were used in a 4 × 4 Latin square design consisting of four periods and four levels of inclusion of DLL: 0%, 12%, 24%, and 36% of dry matter (DM) intake. Results showed that DM intake (DMI), organic matter intake, and gross energy intake (GEI) were similar (p > 0.05) among treatments. Apparent digestibility of organic matter, neutral detergent fiber, and energy decreased with increasing levels of DLL in the ration (p < 0.05). In contrast, digestible crude protein (CP) was higher (p < 0.05) in treatments with 12% and 24% DM of DLL. The inclusion of DLL did not affect (p > 0.05) rumen pH and total volatile fatty acids. Rumen microbial community was not affected (p > 0.05) by treatment. There was a linear reduction (p < 0.05) in CH4 emissions as the levels of DLL in the ration were increased. Results of this study suggest that an inclusion of 12% DM of ration as DLL enhances digestible CP and reduces daily production of enteric CH4 without adversely affecting DMI, rumen microbial population, and fermentation parameters.

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