RESPONSE OF WATER SEDGE IN THE GROWTH ROOM TO FERTILIZER AND TEMPERATURE TREATMENTS

1965 ◽  
Vol 45 (1) ◽  
pp. 60-66 ◽  
Author(s):  
W. L. Pringle ◽  
A. L. van Ryswyk
Keyword(s):  
British Columbia ◽  
Soil Nutrients ◽  
Field Conditions ◽  
Average Yield ◽  
Root Temperature ◽  
Growth Room ◽  
Simulated Field ◽  
Lower Temperature ◽  
Main Component ◽  
Complete Fertilizer

Water sedge (Carex aquatalis Wahl.), the main component of wet bogs, used for hay in central British Columbia responds under growth-room conditions to a complete fertilizer. Potted sedge-sod plugs were grown for five consecutive cuts (242 days) at temperatures of 70° and 40°F and at light intensities less than 1000 ft-c. Reducing the root temperature from 70° to 40°F, which simulated field conditions, lowered the average yield of all treatments by 45%. Phosphorus appeared to be the most limiting element at both temperatures. Nitrogen gave significant increases only at the lower temperature. The addition of soil nutrients more than doubled the recovery of the same nutrients in the forage from plants grown at both 40° and 70°F as compared with controls. On forage not supplied with P, the Ca/P ratio exceeded 3.

RESPONSE OF REED CANARYGRASS ON SEDGE–ORGANIC SOIL TO FERTILITY LEVELS AND TEMPERATURE IN THE GROWTH ROOM

1967 ◽  
Vol 47 (3) ◽  
pp. 305-310 ◽  
Author(s):  
W. L. Pringle ◽  
A. L. van Ryswyk
Keyword(s):  
British Columbia ◽  
Soil Temperature ◽  
Organic Soil ◽  
Average Yield ◽  
Reed Canarygrass ◽  
Peat Soils ◽  
The Third ◽  
Growth Room ◽  
Optimum Productivity ◽  
Lower Temperature

Reed canarygrass grown in a growth room showed marked response to N, P and K on two out of three sedge peat soils of central British Columbia. On the third soil, there was little response to P but marked response to K and N. Reducing the soil temperature from 21.1° to 12.8 °C reduced the average yield 10%; dropping it from 12.8° to 4.4 °C reduced yield a further 15%. P was particularly limiting at the lower temperature. K seemed to be required for vigor and persistence of reed canarygrass. It was concluded that it is necessary to have heavy applications of the proper combination of nutrients for each individual soil, for optimum productivity.

scholarly journals The hamster as a secondary reservoir host of lymphocytic choriomeningitis virus

1976 ◽  
Vol 76 (2) ◽  
pp. 299-306 ◽  
Author(s):  
H. H. Skinner ◽  
E. H. Knight ◽  
L. S. Buckley
Keyword(s):  
Early Pregnancy ◽  
Lymphocytic Choriomeningitis ◽  
Reservoir Host ◽  
Lymphocytic Choriomeningitis Virus ◽  
Field Conditions ◽  
Natural Reservoir ◽  
Virus Source ◽  
Simulated Field

SUMMARYExposure of weaned hamsters to an environment contaminated with LCM virus shed by tolerantly infected mice led to short subclinical infections. If infection occurred in early pregnancy, the young appeared normal at birth but their tissues were highly infective. For two to three months their bites and urine were also highly infective. A viraemia did not persist long enough for successive vertical transmissions of the infection to be likely. However, the viruria persisted in most prenatally infected hamsters for at least eight months and under simulated field conditions was a potent virus source for contact infections, leading to further generations of prenatally infected young. In the absence of the natural reservoir host, such long-term carriers could have been a major factor in causing the build-up of infection in colonies of hamsters which, when purchased as household pets, led to a recent spate of human clinical infections in Germany and the U.S.A.

Exposure of Caged Biomphalaria glabrata (Say) to Investigate Dispersion of Miracidia of Schistosoma mansoni Sambon in Outdoor Habitats in St. Lucia

1972 ◽  
Vol 46 (4) ◽  
pp. 297-306 ◽  
Author(s):  
Edward Suchart Upatham
Keyword(s):  
Schistosoma Mansoni ◽  
Field Experiments ◽  
Natural Habitat ◽  
Biomphalaria Glabrata ◽  
Field Conditions ◽  
Laboratory Studies ◽  
Infection Rates ◽  
Random Fashion ◽  
Simulated Field ◽  
Transmission Studies

1. Laboratory studies showed two types of cages to be suitable for exposing uninfected B. glabrata in field habitats as a means of locating S. mansoni miracidial infestations.2. Tests conducted in tanks under simulated field conditions showed that miracidia moved away from the point of inoculation in non-random fashion and congregated at the margins of the tanks.3. In a natural habitat, miracidia located and infected caged snails at distances of 33 cm vertically and 106·7 cm horizontally.4. The pattern of infection was similar in the simulated field and field experiments, but field infection rates were lower.5. For transmission studies in field habitats, caged laboratorybred snails should be placed at the margin of the habitat to ensure the maximum snail-miracidium interaction.

Comparative Persistence and Mobility of Pyridine and Phenoxy Herbicides in Soil

1989 ◽  
Vol 3 (1) ◽  
pp. 155-161 ◽  
Author(s):  
James R. Jotcham ◽  
David W. Smith ◽  
Gerald R. Stephenson
Keyword(s):  
Biological Activity ◽  
Thin Layer ◽  
Soil Samples ◽  
Biologically Active ◽  
Field Conditions ◽  
Growth Room ◽  
Phenoxy Herbicides

Bioassays with soybeans and lentils were used to compare the persistence of 2,4,5-T, triclopyr, and picloram in soil after applying 0.038, 0.38, and 3.8 kg ae/ha under field conditions. Soil samples were collected from 1 to 269 days after spraying and were kept frozen until growth room bioassays were conducted. Triclopyr was slightly less persistent than 2,4,5-T, but neither herbicide was biologically active during the next season. At least 90% of picloram disappeared within 7 months, but its biological activity was more persistent than that of either triclopyr or 2,4,5-T. Nine months after treatment, neither lentils nor soybeans could be grown in soil treated with picloram at 3.8 kg/ka. Triclopyr and 2,4-D had smiilar soil thin layer chromatographic mobilities in four different scils. Picloram was significantly more mobile than either triclopyr or 2,4,5-T, primarily due to its lower adsorption in the soils examined.

Subclinical Effects and Fenbendazole Treatment of Turkey Ascaridiasis Under Simulated Field Conditions

2002 ◽  
Vol 46 (4) ◽  
pp. 886-892 ◽  
Author(s):  
T. A. Yazwinski ◽  
C. Tucker ◽  
A. Stelzleni ◽  
Z. Johnson ◽  
J. Robins ◽  
...  
Keyword(s):  
Field Conditions ◽  
Simulated Field

scholarly journals Immunisation against coccidiosis in chickens: Tests under simulated field conditions

1982 ◽  
Vol 11 (1) ◽  
pp. 131-144 ◽  
Author(s):  
P.L. Long ◽  
B.J. Millard ◽  
A.F. Batty ◽  
C. da Vison
Keyword(s):  
Field Conditions ◽  
Simulated Field
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