Variations in Potassium Content of Alfalfa Due to Stage of Growth and Soil Type and the Relationship of Potassium and Calcium in Plants Grown upon Different Soil Types 1

1929 ◽  
Vol 21 (7) ◽  
pp. 732-750 ◽  
Author(s):  
John F. Fonder
Keyword(s):  
Soil Type ◽  
Potassium Content ◽  
Soil Types ◽  
Relationship Of ◽  
The Relationship

LACTOSE-FERMENTING BACTERIA FROM THE INTESTINAL CONTENTS OF MARINE FISH

1933 ◽  
Vol 8 (1) ◽  
pp. 291-300 ◽  
Author(s):  
NORMAN E. GIBBONS
Keyword(s):  
Marine Fish ◽  
Marine Fishes ◽  
Soil Types ◽  
Intestinal Contents ◽  
Fermenting Bacteria ◽  
Relationship Of ◽  
The Relationship ◽  
Contaminated Waters

From 112 marine fishes examined for the presence of lactose-fermenting bacteria, 31 strains were isolated which produced acid and gas in this sugar and 3 which produced acid only.Ten strains belonged to the genus Aerobacter, 8 being Aer. aerogenes and 2 probably varieties of Aer. cloacae. Nine were soil types and the relationship of one was doubtful.Of 24 Escherichia types, 8 were faecal mammalian strains and one was doubtful. These belonged to the species Esch. coli, Esch. communior, Esch. grünthali and Bact. immobilis. One was found in a haddock taken 3 miles offshore; the others were found in fish taken in contaminated waters or near shore.Esch. coli, Esch. communior and Aer. aerogenes are not normal inhabitants of the intestinal tracts of marine fish.

Investigations on brown rot of apricots caused by Sclerotinia fructicola (Wint.) Rehm. II. The relationship of the potassium status of apricot trees to brown rot susceptibility

1956 ◽  
Vol 7 (6) ◽  
pp. 516 ◽  
Author(s):  
GC Wade
Keyword(s):  
Potassium Chloride ◽  
Brown Rot ◽  
Potassium Content ◽  
Regression Equations ◽  
Potassium Fertilizer ◽  
Negative Relation ◽  
Satisfactory Treatment ◽  
Relationship Of ◽  
The Relationship ◽  
Spray Applications

It is shown that under Tasmanian conditions there is a negative relation between the potassium status of apricot trees and their susceptibility to brown rot. From regression equations calculated, it is suggested that trees with a potassium content of about 4.6 per cent. in oven-dry leaves would be resistant to brown rot. Difficulty was experienced in increasing the potassium content of the trees by soil or spray applications of potassium fertilizer, but when this was achieved, some reduction in brown rot incidence occurred. Regular annual soil dressings of potassium chloride at the rate of 2 lb per tree was the most satisfactory treatment tested.

THE RELATIONSHIP OF PATTERN AND GRADIENT OF SLOPES TO SOIL TYPE

1965 ◽  
Vol 45 (1) ◽  
pp. 96-101 ◽  
Author(s):  
D. F. Acton
Keyword(s):  
Soil Type ◽  
Close Relationship ◽  
The Individual ◽  
Glacial Landforms ◽  
Relationship Of ◽  
The Relationship

Three glacial landforms (hummocky moraine, linear disintegration ridge, and washboard ridge) resulting from ice disintegration were studied to determine the relationship of the type of landform to the distribution of soil members or series. A close relationship was observed between a soil member and the nature of the slope segment on which it occurred. Calcareous Dark Brown soils were observed on the uppermost convex portion of the slope on gradients usually greater than 8%; Orthic Dark Brown soils on simple intermediate slopes or 5–8% gradient; Eluviated Dark Brown soils on slightly concave footslopes of 1–3% gradient; Rego Dark Brown wherever 3–5% slopes extended from the margin of depressions; and Gleysolic soils in the concave depressions. The extent of the soil members was found to be a function of the extent of the individual slope segment present in the landform. Orthic Dark Brown soils predominated, to approximately the same extent, on all landforms. Gleysolic soils were extensive in hummocky moraines whereas Eluviated and Calcareous Dark Brown soils were more extensive on ridged landforms, particularly on linear disintegration ridges. Rego Dark Brown soils were most extensive on washboard ridges.

scholarly journals Soil analysis as the foundation of precision nutritive supply in the Hajdúszoboszló region

2007 ◽  
pp. 141-148
Author(s):  
Róbert Víg ◽  
Attila Dobos ◽  
Zoltán Pongrácz
Keyword(s):  
Soil Type ◽  
Phosphorus Content ◽  
Soil Analysis ◽  
Soil Phosphorus ◽  
Humus Content ◽  
Potassium Content ◽  
Soil Types ◽  
Meadow Soil ◽  
Chernozem Soil ◽  
Solonetz Soil

Larger cultivated plots are heterogeneous from a pedological aspect. Heterogeneity causes problems during fertilization and harvest. The heterogeneity of cultivated areas can be compensated by fertilization which is based on soil analysis. We carried out research into the changes of the soil on three soil types, from 1966 to 2006, on the cultivated areas of Hajdúszoboszló.There were no significant changes in pH on chernozem meadow soil and meadow chernozem soil, but the pH increased in 0-30 cm layer on type meadow solonetz soil. The saline content decreased in every examined soil type. Decrease was the largest on meadow solonetz soil. Decline of humus content was the largest (0.95%) on chernozem meadow soil, and the smallest (0.39%) on meadow chernozem soil. The nitrogen content decreased with 528 ppm in the 0-30 cm layer on chernozem meadow soil, and decreased by 186 ppm on meadow solonetz soil. Phosphorus andpotassium content increased in every examined soil types. Rise of phosphorus content was 188.9 ppm in the 0-30 cm layer on meadow chernozem soil. The potassium content rose by 153.7 ppm on this soil type. Phosphorus content increased with 70.8 ppm, and potassium content increased by 57.6 ppm from 1966 to 2006.

Relationship of nematode communities to human demographics and environment in agricultural fields and fallow lands in Senegal

2003 ◽  
Vol 19 (3) ◽  
pp. 279-290 ◽  
Author(s):  
Patrice Cadet ◽  
Emmanuelle Pate ◽  
Jean Thioulouse
Keyword(s):  
Soil Type ◽  
Large Scale ◽  
Negative Influence ◽  
Parasitic Nematodes ◽  
Rainfall Gradient ◽  
Nematode Communities ◽  
Disturbed Areas ◽  
Fallow Lands ◽  
Relationship Of ◽  
The Relationship

One hundred and nine soil samples were collected in 69 different localities along two transects, one North-South, about 900 km in length, and the other East-West (750 km in length), across Senegal and Gambia. The first transect followed a rainfall gradient and the second a human density gradient. The relationship between carbon content, C/N ratio and soil type on the abundance and species distribution of the nematodes along the transects was studied. Results showed that short-term fallows did not influence the specific structure of the communities, when compared with the nematode communities of fields located in the immediate vicinity, where Scutellonema cavenessi and Tylenchorhynchus gladiolatus were the dominant species. The expected negative influence of human disturbance on nematode occurrence seemed to be compensated by greater crop diversity, mainly near the towns. Less-disturbed areas also maintained a high diversity, but were characterized by the presence of particular species such as Xiphinema spp. Soil type was the most important factor affecting the species composition of the nematode community. As a result, nematode communities followed a distribution in areas, corresponding to the successive soil types, but did not change in relation to the human or climatic gradients. At a large scale, the study of plant-parasitic nematodes can give both different and complementary information on the ecological trends of an area to that of free-living nematodes.

The Relationship of Soil Adsorption of EPTC to Oats Injury in Various Soil Types

Weeds ◽  
1959 ◽  
Vol 7 (1) ◽  
pp. 88 ◽  
Author(s):  
Floyd M. Ashton ◽  
Thomas J. Sheets
Keyword(s):  
Soil Types ◽  
Soil Adsorption ◽  
Relationship Of ◽  
The Relationship

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

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