ORGANIC MATTER DISTRIBUTION WITH PARTICLE-SIZE IN SURFACE HORIZONS OF SOME SOMBRIC SOILS IN VANCOUVER ISLAND

1980 ◽  
Vol 60 (3) ◽  
pp. 583-586 ◽  
Author(s):  
K. BROERSMA ◽  
L. M. LAVKULICH
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Surface Area ◽  
Continuous Flow ◽  
Total Organic Matter ◽  
Coarse Silt ◽  
Matter Distribution ◽  
Fine Silt ◽  
Wet Sieving ◽  
Organic Matter Distribution

The surface horizons of some Sombric Brunisols and Podzols were fractionated to determine the distribution of the organo-mineral complexes. The soils were dispersed in water using ultrasonics and fractionated by wet sieving and the continuous flow supercentrifuge. The amounts of organic matter and the surface area of each fraction were determined. The weight of organic matter per unit of surface area increased with increasing size of soil separates. A considerable amount of organic matter is associated with the coarser fractions, with 5, 12 and 49% of the total organic matter being associated with the sand, coarse silt and fine silt fractions, respectively.

Bacterial and organic matter distribution in the sediments of the Thracian Sea (NE Aegean Sea)

2007 ◽  
Vol 27 (17) ◽  
pp. 2187-2197 ◽  
Author(s):  
Paraskevi N. Polymenakou ◽  
Glykeria Fragkioudaki ◽  
Anastasios Tselepides
Keyword(s):  
Organic Matter ◽  
Aegean Sea ◽  
Matter Distribution ◽  
Organic Matter Distribution

Intake and digestion of lucerne hay and wheat straw by cattle 14 to 56 weeks of age

1991 ◽  
Vol 42 (4) ◽  
pp. 621 ◽  
Author(s):  
J Leibholz
Keyword(s):  
Organic Matter ◽  
Wheat Straw ◽  
Dry Matter ◽  
Total Organic Matter ◽  
Wet Sieving

Eight Friesian calves, 8 weeks of age, were prepared with rumen and abomasal cannulae. Four calves were given lucerne and four calves were given wheat straw sprayed with urea and minerals. The diets were changed over between the calves every 6 weeks until the calves were 56 weeks of age. The particles in the rumen that passed through a 1 mm screen during wet sieving were 66 to 73% of the total particles in the rumen of calves given lucerne and 77 to 84% of the particles in the rumen of the calves given wheat straw. The digestion of organic matter in the stomach was 71 to 79% of the total organic matter digested in the calves given lucerne. In the calves given wheat straw, between 82 and 95% of the total organic matter digestion occurred in the stomach. The apparent digestion of dry matter in the calves given lucerne was 61-6856 and did not change with age of the calves. The apparent digestion of dry matter when the calves were given wheat straw was 42% at 14 weeks of age, and it increased to 53% at 56 weeks of age. The digestion of nitrogen in the intestine in the heifers given wheat straw increased to 26 weeks of age while that of heifers given lucerne hay decreased.

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