RELATIONSHIPS BETWEEN LEAF AND SOIL BORON AND BORON TOXICITY OF PEACHES IN BRITISH COLUMBIA

1985 ◽  
Vol 65 (1) ◽  
pp. 213-217 ◽  
Author(s):  
G. H. NEILSEN ◽  
P. B. HOYT ◽  
J. YORSTON ◽  
W. VAN LIEROP
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Soil Profile ◽  
Soil Surface ◽  
Boron Toxicity ◽  
Leaf Boron

Soil and leaf boron were determined in British Columbia peach orchards exhibiting a range of B concentration, including suspected toxicity. B toxicity always occurred when leaf concentration in May exceeded 130 mg/kg, and frequently occurred when leaf B concentration in July was between 50 and 83 mg/kg. Revised leaf standards were suggested to indicate a desirable range of 26–50 mg/kg leaf B in July. Leaf and soil B for peaches were generally correlated. Exceptions occurred when soil B was concentrated near the soil surface or deep in the soil profile. Leaf B in July was from 26 to 50 mg/kg when soil B to a 90-cm depth ranged from 0.2 to 0.4 mg/L of soil. Key words: Boron toxicity, leaf and soil B, peaches

Production of uredinia and telia by stalactiform blister rust in British Columbia

1993 ◽  
Vol 71 (3) ◽  
pp. 519-521 ◽  
Author(s):  
B. J. van der Kamp
Keyword(s):  
British Columbia ◽  
Life Cycle ◽  
Key Words ◽  
Alternate Host ◽  
Alternate Hosts ◽  
Blister Rust ◽  
Dry Areas ◽  
Do So

Records of uredinia and telia production on the alternate hosts of Cronartium coleosporioides in British Columbia and inoculation of Castilleja miniata with aeciospores collected from various locations showed that rust isolates from dry areas of the interior of British Columbia do not produce uredinia and may have lost the ability to do so. Collections from somewhat wetter areas produced uredinia or mixtures of uredinia and telia immediately following aeciospore inoculations, and field collections from such areas in June commonly had mixtures of uredinia and telia. Loss of the uredinial stage may be a response to climates that are often unsuitable for the spread or survival of the rust on the alternate host. Key words: stalactiform rust, uredinia, telia, rust life cycle.

EFFECT OF CANOPY AND INCORPORATION ON METRIBUZIN PERSISTENCE IN SOILS

1989 ◽  
Vol 69 (3) ◽  
pp. 711-714 ◽  
Author(s):  
K. I. N. JENSEN ◽  
E. R. KIMBALL ◽  
J. A. IVANY
Keyword(s):  
Key Words ◽  
Half Life ◽  
Field Tests ◽  
Soil Surface ◽  
Bare Soil ◽  
Field Conditions ◽  
Row Width ◽  
Sampling Zone

The half-life of metribuzin applied to a bare soil surface was calculated to be 3–7 d over four field tests. An artificial cover erected after application or a shallow incorporation increased the half-life of metribuzin approximately 2.5- to 3-fold. Leaching out of the 0- to 5-cm-deep sampling zone could not account for loss of metribuzin. It was concluded that metribuzin persistence may be affected by volatility and/or photodecomposition losses under field conditions, especially shortly after application. Key words: Metribuzin half-life, volatility, photodecomposition, row width

scholarly journals Spreading of chemical substance after its accidental spillage onto the soil surface under unsaturated conditions and variable porosity

2019 ◽  
pp. 41-44
Author(s):  
Olena Kozhushko ◽  
Petro Martyniuk
Keyword(s):  
Mathematical Model ◽  
Soil Moisture ◽  
Soil Profile ◽  
Moisture Transport ◽  
Soil Surface ◽  
Chemical Substance ◽  
High Concentration ◽  
Solute Transfer ◽  
Variable Porosity ◽  
The One

In this paper we study a mathematical model of soil moisture transport with variable porosity. The problem is set for the case of highly concentrated solute spilled onto soil surface. We investigate the way solute transfer, adsorption of contaminant by soil particles and variable porosity influence infiltration of solute into the soil profile. For that purpose, two models are used: a classical one and the one with consideration of mentioned factors. By comparing the results of both models, we established that high concentration of solute causes moisture transport to transpire more slowly, and the pollutant to remain on the soil surface for longer time. Numerical results indicate that porosity can vary considerably under the conditions of intensive contamination with salts.

Response of some vegetable crops to soil-applied halides

1992 ◽  
Vol 72 (4) ◽  
pp. 555-567 ◽  
Author(s):  
S. C. Sheppard ◽  
W. G. Evenden
Keyword(s):  
Key Words ◽  
Soil Surface ◽  
Competitive Interaction ◽  
The Other ◽  
Vegetable Crops ◽  
Tissue Concentrations ◽  
Industrial Pollutants ◽  
High Concentrations ◽  
Corn Kernels ◽  
Key Words Fluoride

The halide elements are environmentally important and share some common attributes. The heaviest, I, and the lighest, F, are quite toxic and are important industrial pollutants. They are also effectively retained in soils. The others, Cl and Br, can be accumulated to high concentrations in plants, are used in agriculture and are highly mobile in soils. This study investigated the behaviour of the halides in plots, outdoor lysimeters, and laboratory sorption and excised-root experiments. Sorption on soil was ordered as F > I > Br > Cl. Concentrations in plants were generally ordered as CI ≥ Br > > F ≥ I, the inverse of the sorption ordering, as expected. Older tissues, which were also closest to the soil surface, had higher concentrations, and sequestered tissues, such as corn kernels and cabbage heads, had lower concentrations. There was evidence of competitive interaction among the halides and with soil anions such as phosphate and sulfate. This competition reduced the toxicity of I and modified tissue concentrations of the halides, P and S. Another interesting interaction was an increase in Cl and I sorption on soil solids when there were elevated levels or the other halides. Overall, the study of the halides in combination enhanced our understanding of their individual behaviours. Key words: Fluoride, chloride, bromide, iodide, vegetable

A SUB-TILL SAPROLITE AND THE OVERLYING SOIL PROFILE NEAR MOUNT ORFORD, SOUTHERN QUEBEC

1984 ◽  
Vol 64 (4) ◽  
pp. 577-585 ◽  
Author(s):  
C. R. DE KIMPE ◽  
M. R. LAVERDIÈRE ◽  
P. LASALLE
Keyword(s):  
Key Words ◽  
Clay Minerals ◽  
Soil Profile ◽  
Mineralogical Composition ◽  
Magnetic Mineral ◽  
Mineral Assemblages ◽  
Extractable Al

A saprolite deposit and the overlying soil profile developed in a glacial diamicton were sampled near Mount Orford, Southern Quebec. The two materials differed mainly by the magnetic mineral and extractable Al contents, by the Fedithionite/Feoxalate ratio and by the mineralogical composition. Illite and chlorite were the dominant clay minerals in the till whereas muscovite and kaolinite were the major minerals in the saprolite. A comparison was also made with another previously described saprolite deposit 4 km away from this one, in which chlorite was slightly transformed to smectite. It is suggested, from the mineral assemblages, that the two saprolites have probably formed at different times, the first one during Tertiary and the second one during an interglacial stage. Key words: Saprolite, glacial diamicton, kaolinite, muscovite, Tertiary alteration

scholarly journals CONTROL OF CUTWORMS IN ASPARAGUS FIELDS IN THE INTERIOR OF BRITISH COLUMBIA

1957 ◽  
Vol 37 (2) ◽  
pp. 108-112
Author(s):  
F. L. Banham ◽  
R. H. Handford
Keyword(s):  
British Columbia ◽  
Soil Surface ◽  
Moist Soil ◽  
Highly Effective ◽  
Euxoa Ochrogaster ◽  
Dry Soil

Emulsions of dieldrin, aldrin, isodrin, toxaphene and chlordane applied to the soil surface and incorporated to a depth of about 4 inches proved highly effective in controlling the red-back cutworm, Euxoa ochrogaster (Guen.) when tested in asparagus fields in the interior of British Columbia in the summer of 1953 and 1954. In 1953 aldrin emulsion mixed with the soil was much more effective than when it was left on the soil surface, Bran bait containing paris green, although giving fairly satisfactory control, was less effective and slower in action than the emulsions. In 1952, dieldrin, aldrin, and isodrin dusts, applied to the soil surface, were superior to and faster in action than bran baits containing aldrin or endrin; all of the 1952 treatments were apparently slower in action in dry soil than in relatively moist soil. A survey of asparagus fields treated by growers in 1953 but not in 1954 indicated that aldrin emulsion, mixed with the soil at about 4 lb. of toxicant per acre, protects asparagus for at least two years.

Isoetes × marensis, a new interspecific hybrid from western Canada

1995 ◽  
Vol 73 (9) ◽  
pp. 1345-1353 ◽  
Author(s):  
Donald M. Britton ◽  
Daniel F. Brunton
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
British Columbia ◽  
Key Words ◽  
North American ◽  
Interspecific Hybrid ◽  
Western Canada ◽  
Hybrid Plants ◽  
Surface Ornamentation ◽  
Scanning Electron

A new interspecific hybrid in Isoetes, I. maritima Underw. × I. howellii Engelm., is delineated and described from the Shuswap Highlands region of British Columbia by means of cytology and scanning electron microscopy of spores. Isoetes × marensis D.M. Britton and D.F. Brunton, hyb.nov. is the name proposed for this taxon. It is triploid (3x; 2n = 33) and is believed to produce only sterile and (or) aborted spores. Hybrid plants have polymorphic spores that demonstrate size and surface ornamentation features intermediate between those of the putative parents. Three populations were examined, each growing with both of the putative parents in silt and sand among granite cobble over clay along an emergent lakeshore. Isoetes × marensis is the first described North American hybrid involving an amphibious Isoetes. It is expected to be a rare taxon owing to the restricted sympatric area of the putative parents and their tendency to occupy different habitats. Key words: Isoetes, Isoetes howellii, Isoetes maritima, hybrid, British Columbia.

Cultivation of Hericium abietis on conifer sawdust

1997 ◽  
Vol 75 (7) ◽  
pp. 1155-1157 ◽  
Author(s):  
Guoping Xiao ◽  
Bill Chapman
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Mushroom Cultivation ◽  
Old Growth ◽  
Old Growth Forest

Hericium abietis was isolated from a sporocarp collected near Quesnel Lake in the central interior of British Columbia and successfully cultivated indoors on conifer sawdust. Key words: Hericium abietis, mushroom cultivation, old growth forest.

Nucleation during primary succession in the Canadian Rockies

1993 ◽  
Vol 71 (8) ◽  
pp. 1093-1096 ◽  
Author(s):  
D. J. Blundon ◽  
D. A. MacIsaac ◽  
M. R. T. Dale
Keyword(s):  
British Columbia ◽  
Nitrogen Fixation ◽  
Key Words ◽  
Rocky Mountains ◽  
Primary Succession ◽  
The Other ◽  
Pioneer Species ◽  
Canadian Rocky Mountains ◽  
Successional Species ◽  
Key Words Colonization

A study of nucleation during primary succession was carried out on age sequences of communities at two sites in the Canadian Rocky Mountains: one at the Mount Robson moraines, British Columbia, the other at Southeast Lyell Glacier, Alberta. The study concentrated on the associations of species with the nitrogen-fixing plants Hedysarum boreale var. mackenzii at Mount Robson moraines and Dryas drummondii at Southeast Lyell Glacier because those plants might serve as nuclei for colonization by other species, thus facilitating succession. The data show that recruitment of later successional species is greater in patches of the two pioneer species, but the fact that recruitment takes place away from the plants also suggests that although there is nucleation, it is not necessary for succession at these sites. Key words: colonization, nitrogen fixation, nucleation, succession.

VARIATIONS OF pH WITH ANNUAL PRECIPITATION IN LOAMY FOREST SOILS

1983 ◽  
Vol 63 (2) ◽  
pp. 401-403
Author(s):  
C. B. CHAMPTON
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Soil Ph ◽  
Forest Soils ◽  
Annual Precipitation ◽  
Ph Measurements ◽  
Changing Patterns

Colorimetric soil pH measurements made systematically across Burnaby Mountain in well-drained loamy soils of the rainforest of British Columbia over an 8-yr period from 1974 until 1981 showed that acidification of the subsoil increased after two consecutive drier-than-average years. This changing acidity contrasted with the relatively stable acidity of the subsoil in imperfectly drained soils, regardless of changing patterns of precipitation. Key words: pH, forests, loams, precipitation

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