Red Earth, White Earth by Will Weaver

1987 ◽  
Vol 22 (3) ◽  
pp. 225-225
Author(s):  
George F. Day
Keyword(s):  
2001 ◽  
Author(s):  
Diana Kuklinski ◽  
Christopher Allen
Keyword(s):  

2012 ◽  
Author(s):  
Gerald Vizenor ◽  
Jill Doerfler
Keyword(s):  

1932 ◽  
Vol 7 (1) ◽  
pp. 35-42 ◽  
Author(s):  
K. R. U. Todd

The purpose of this paper is to put on record the discovery of various sites, containing traces of prehistoric man, in the neighbourhood of Bombay.The area of greatest importance is that of Worli. It is a cotton milling suburb of Bombay, distant some 4 miles from the Fort, and is situated on low lying marshy ground and bounded to the West by a low steep hill having a maximum height of 100 ft. O.D., and consisting of igneous basalt overlying amygdaloidal trap with a dyke of F.W. strata between. This dyke contains fossils of marsh tortoises, frogs and plants resembling bulrushes. The basalt is capped with red earth which is decomposing trap, and contains nodules of agate and blocks of chert. West of the hill is the Arabian Sea. The northern extremity of this hill ends in a spur which juts out into the sea, and here is the fishing village of Koliwada, consisting of mud huts.


1991 ◽  
Vol 42 (5) ◽  
pp. 735 ◽  
Author(s):  
JF Angus ◽  
RA Fischer

Dryland wheat was fertilized with ammonium nitrate or liquid urea-ammonium nitrate at the time of sowing or about 3 months later (generally at the terminal-spikelet stage) on a well-drained site near Harden on the south-west slopes of New South Wales. The experiments continued from the second to the fifth year (1981-1984) of the cropping phase of a crop-pasture rotation. The maximum agronomic efficiencies for yield in the four consecutive years were 19, 4, 23 and 25 kg grain per kg of applied nitrogen (N). The three large responses were obtained in wetter than average seasons and the small response was obtained during drought. In the last three years of the study the yield response to nitrogen at the terminal-spikelet stage was found to be close to but slightly less than that for N applied at sowing. In those years the agronomic efficiencies for the late-applied N were 0, 22 and 22. The apparent recovery of fertilizer N in the above-ground parts of the crop at maturity was up to 70% of the fertilizer applied in the year of sowing, and, after the drought during which there was little uptake of fertilizer N, up to 62% by the subsequent crop. The fertilizer efficiencies in the non-drought years were higher than generally reported in south-eastern Australia, and indicate potential for profitable delayed application of N fertilizer to wheat. Grain-protein responses were variable from year to year and are discussed against a simple theoretical background of the amount of N applied and grain-yield response.


Soil Research ◽  
1981 ◽  
Vol 19 (3) ◽  
pp. 323 ◽  
Author(s):  
CA Campbell ◽  
RJK Myers ◽  
KL Weier

The procedure of Stanford and coworkers was used to quantitatively relate net nitrogen mineralization in five Queensland semi-arid soils to temperature. The concentration of potentially mineralizable nitrogen (No) (1) ranged from 67 �g nitrogen g-1 for a red earth subsoil to 256 for a recently cultivated cracking clay surface soil, (2) was directly proportional to total soil carbon, (3) was greater in surface than in subsurface soil, and (4) was greater in subtropical than tropical soils. Expressed as a fraction of total nitrogen (No/Total N), it ranged between 8 and 21%, and was directly proportional to cation exchange capacity, perhaps implicating expanding lattice clays in stabilization of cell lysates and metabolites. The mineralization rate constant (k) was directly proportional to total carbon, the fuel for microbially mediated reactions in soil. The average k for surface soils was interpolated to be 0.058, 0.031, and 0.018 week-1, corresponding to half-lives of 11.9, 22.4 and 38.5 weeks, at 35�, 25� and 15�C, respectively; these values are similar to those reported for U.S.A. and Chilean soils. The Arrhenius relationship between k and temperature for surface soils (log k = 6.14-2285/T) was similar to that reported by Stanford for U.S.A. soils, and indicates that this relationship might be a general one.


Soil Research ◽  
1990 ◽  
Vol 28 (4) ◽  
pp. 539 ◽  
Author(s):  
CJ Chartres ◽  
RW Cumming ◽  
JA Beattie ◽  
GM Bowman ◽  
JT Wood

Samples were collected from unimproved road reserves and adjacent paddocks on a 90 km transect crossing red-brown earth soils in the west and red earth soils in the east. Measurements of pH in water and CaCl2 indicated that the red earths have been acidified by approximately 0.5 pH units over the last 30-40 years. Small increases in CaCl2-extractable A1 were also recorded for the acidified red earths. The red-brown earths do not appear to have been markedly affected by soil acidification to date. Clay mineralogical data and measurements of cation exchange capacity of the <2 �m fraction indicate that red-brown earths are better buffered against acidification than red earths. However, small differences in management practices and rainfall along the transect may also be partially responsible for differences in acidification between soil types.


1999 ◽  
Vol 242 (3) ◽  
pp. 793-797 ◽  
Author(s):  
W. M. Dong ◽  
X. K. Wang ◽  
J. Z. Du ◽  
X. Y. Bian ◽  
F. Ma ◽  
...  
Keyword(s):  

1940 ◽  
Vol 30 (4) ◽  
pp. 639-653 ◽  
Author(s):  
G. Nagelschmidt ◽  
A. D. Desai ◽  
Alex. Muir

The mineral compositions of the clays from a red earth and a black cotton soil from Hyderabad, Deccan State, India, occurring in close proximity in the field are determined. Both soils are derived from the same or from very similar parent rocks, a coarsely crystalline granite or gneiss.For both soils there is practically no variation in the mineralogical composition of the clay throughout the profile, but for any given clay there is some variation with grain size. The main contrast between the two is that the red clay contains predominantly kaolinite or halloysite, whereas the black clay contains mainly beidellite, a member of the montmorillonite group. The topography appears to be the principal factor associated with this difference in minerals, and the processes of weathering believed to have produced the contrasted clays are discussed with reference to experiments on the leaching of felspar in the laboratory and on hydrothermal synthesis.


Sign in / Sign up

Export Citation Format

Share Document