scholarly journals Viability and glycogen reserves in the newly liberated larvae of Ostrea edulis L.

1957 ◽  
Vol 36 (2) ◽  
pp. 335-337 ◽  
Author(s):  
Dorothy M. Collyer
Keyword(s):  
Organic Matter ◽  
Standard Laboratory ◽  
Ostrea Edulis ◽  
Laboratory Rearing ◽  
Glycogen Reserve

Samples of twelve broods of oyster larvae were subjected to a standard laboratory rearing technique while other samples were assayed for glycogen. The glycogen reserves of the larvae at liberation lay between 13·4 and 15·4% of the dry organic matter. No correlation was observed between the glycogen reserve and either the size of the larvae at liberation or the yield of spat in the rearing experiments

scholarly journals Effect of Soil Properties on forms of potassium in Some Soils of Homs Governorate

2019 ◽  
Vol 26 (3) ◽  
pp. 39-44
Author(s):  
Sameer M. Shamsham ◽  
Reem F. Nasra ◽  
Rawaa Z. Ayoush
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Soil Properties ◽  
Water Soluble ◽  
Standard Laboratory ◽  
Exchangeable K ◽  
Positive Correlation ◽  
Laboratory Procedures

The study was conductedto determine the forms of potassium in soils (water soluble K, exchangeable K, available K, non-exchangeable K, lattice K, total K) in some of Homs soils using standard laboratory procedures. The soils were ASHRAFIA, MARANA, MOUKHTARIA, ROUGHAMA, SANKARY, MASTORAH, SADAD, ARQAYA, GDAIDA, SAYED. The samples were analyzed for mechanical composition of soil viz., sand, silt, clay and chemical composition viz., pH, EC, O.M., and analyzed the different forms of potassium. The amount of water soluble, exchangeable, available, non-exchangeable, lattice and total-K in soils; ranged from 1.49 – 145.92, 244.46 – 787.71, 245.95 – 954.83, 11.10 – 836.57, 3678.08 – 18041.08 and 4583.00 – 19643 mg/Kg. The study showed that lattice K is the largest part of total K in the soils, while the water soluble K is the lowest part of total K.The total K and lattice K showed significant and positive correlation with pH.  Water-soluble K concentrations positively correlated with organic matter and sand. The available K showed significant and positive correlation with sand.

Relating particulate organic matter-nitrogen (POM-N) and non-POM-N with pulse crop residues, residue management and cereal N uptake

Agronomie ◽  
2002 ◽  
Vol 22 (7-8) ◽  
pp. 777-787 ◽  
Author(s):  
Graeme D. Schwenke ◽  
Warwick L. Felton ◽  
David F. Herridge ◽  
Dil F. Khan ◽  
Mark B. Peoples
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Crop Residues ◽  
N Uptake ◽  
Residue Management ◽  
Pulse Crop

Poultry Manure as a Fertilizer

EDIS ◽  
2013 ◽  
Vol 2013 (11) ◽  
Author(s):  
Michael A. Davis ◽  
Doug R. Sloan ◽  
Gerald Kidder ◽  
R. D. Jacobs
Keyword(s):  
Organic Matter ◽  
Environmental Factors ◽  
Nitrogen Content ◽  
Soil Amendment ◽  
Poultry Manure ◽  
Nutrient Retention ◽  
High Nitrogen Content ◽  
High Nitrogen ◽  
Animal Science ◽  
Fact Sheet

Animal manures have been used as natural crop fertilizers for centuries. Because of poultry manure’s high nitrogen content, it has long been recognized as one of the most desirable manures. Besides fertilizing crops, manures also supply other essential plant nutrients and serve as a soil amendment by adding organic matter, which helps improve the soil’s moisture and nutrient retention. Organic matter persistence will vary with temperature, drainage, rainfall, and other environmental factors. This 2-page fact sheet was written by Michael A. Davis, D.R. Sloan, Gerald Kidder, and R.D. Jacobs, and published by the UF Department of Animal Science, November 2013. http://edis.ifas.ufl.edu/aa205

Justification of the need to increase the fertility of reclaimed alluvial soils of JSC «Moskovskoe»

2020 ◽  
pp. 44-48
Author(s):  
Andrey ilinsky ◽  
Alexander Nefedov ◽  
Konstantin Evsenkin
Keyword(s):  
Organic Matter ◽  
Agricultural Land ◽  
Crop Yields ◽  
Anthropogenic Impacts ◽  
Fertility Restoration ◽  
Research Work ◽  
Alluvial Soils ◽  
Ecological Stability ◽  
Reclaimed Land ◽  
Adverse Weather

Global climatic changes, technogenic pollution by pollutants, violations of technologies of exploitation of reclaimed land lead to a decrease in fertility and soil degradation of agricultural land. Adverse weather conditions, resulting in a lack of adequate flood water, and economic difficulties in agriculture make it difficult to fill the deficit of organic matter and macronutrients in reclaimed alluvial soils. The monitoring of agrochemical properties of alluvial meadow medium-loamy soil of the stationary site (reclaimed lands of JSC «Moskovskoye» of Ryazan region), located in the floodplain of the Oka river, conducted by the Meshchersky branch of Vniigim, showed the presence and intensification of degradation changes in the soil. Thus, comparing the agrochemical indicators in the layer 0–20 cm, carried out in 1995, with the indicators of 2019, it should be noted a decrease in soil fertility. The decrease in soil quality was expressed in a decrease in the amount of mobile phosphorus by 37.6 %, mobile potassium by 53.3 %. Also, during this time there was a decrease in organic matter by 9.1 %, and an increase in soil acidity was 0.6 pH. As a result of such changes, soils lose ecological stability and become more vulnerable to adverse weather and negative anthropogenic impacts. In such a situation, advanced agricultural techniques should be actively used to obtain guaranteed, environmentally safe crop yields and restore the fertility of degraded reclaimed soils. In this regard, there is a need to develop innovative methods of fertility restoration of degraded alluvial soils in reclaimed lands using multi-component organic-mineral ameliorants. Meshchersky branch performs research work in addressing this issue.

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