EMISSION OF LEGACY CHLORINATED PESTICIDES FROM AGRICULTURAL AND ORCHARD SOILS IN BRITISH COLUMBIA, CANADA

2006 ◽  
Vol 25 (6) ◽  
pp. 1448 ◽  
Author(s):  
Terry F. Bidleman ◽  
Andi D. Leone ◽  
Fiona Wong ◽  
Laurens van Vliet ◽  
Sunny Szeto ◽  
...  
Keyword(s):  
British Columbia ◽  
Chlorinated Pesticides ◽  
Orchard Soils

PHYTOPHTHORA SPP. IN SOILS OF THE OKANAGAN AND SIMILKAMEEN VALLEYS OF BRITISH COLUMBIA

1964 ◽  
Vol 42 (10) ◽  
pp. 1411-1415 ◽  
Author(s):  
D. L. McIntosh
Keyword(s):  
British Columbia ◽  
Irrigation Water ◽  
Soil Samples ◽  
Phytophthora Cactorum ◽  
Phytophthora Spp ◽  
Orchard Soils ◽  
Chemotactic Effect ◽  
Irrigated Soils ◽  
Cultivated Soils

Phytophthora cactorum is widely distributed in irrigated soils in the Okanagan and Similkameen valleys of British Columbia. Other species isolated, when over 1800 soil samples were assayed for the presence of Phytophthora fungi, were P. cryptogea twice, P. cambivora once, P. megasperma var. sojae once, and P. drechsleri twice. Phytophthora spp. were not recovered from virgin soils nor from non-irrigated cultivated soils, nor from orchard soils receiving irrigation water that is chlorinated. P. cactorum, P. cryptogea, and P. cambivora are pathogenic to rootlets of pear, cherry, apricot, and peach seedlings. P. megasperma var. sojae and P. drechsleri were weakly to non-pathogenic to these hosts. Pear and apple rootlets exerted a chemotactic effect on zoospores of P. cambivora and P. cactorum.

Measurement of plant‐available zinc in British Columbia orchard soils

1987 ◽  
Vol 18 (2) ◽  
pp. 161-186 ◽  
Author(s):  
Denise Neilsen ◽  
Paul B. Hoyt ◽  
Angus F. MacKenzie
Keyword(s):  
British Columbia ◽  
Available Zinc ◽  
Orchard Soils

DISTRIBUTION OF SOIL Zn FRACTIONS IN BRITISH COLUMBIA INTERIOR ORCHARD SOILS

1986 ◽  
Vol 66 (3) ◽  
pp. 445-454 ◽  
Author(s):  
P. B. HOYT ◽  
A. F. MacKENZIE ◽  
D. NEILSEN
Keyword(s):  
British Columbia ◽  
Organic Matter ◽  
Residual Fraction ◽  
Separate Determination ◽  
Total Soil ◽  
Wide Range ◽  
Organic Fractions ◽  
Soil Zn ◽  
Zn Availability ◽  
Orchard Soils

The distribution of Zn in soil fractions was determined for 20 representative orchard soils from the British Columbia Interior. This was part of a larger study to examine Zn availability to fruit trees. Medium to high levels of total soil Zn were measured (51.5–226.3 mg kg−1) with an average of 89.7 mg kg−1. A sequential fractionation showed that 0.3–23.2% of total soil Zn was exchangeable, 0.5–29.7% was associated with organic matter, 1.3–15% was associated with Fe + Al oxides and 45.6–92% was residual. A separate determination indicated that 6.4–24% soil Zn was associated with Mn oxides. Except for the Fe + Al oxide fraction for which no correlations were made, amounts of Zn in the fractions were significantly positively correlated with total Zn, and also, with Bray P1 extractable P and organic matter content. Zinc in the exchangeable and organic fractions was negatively correlated with both pH and residual Zn. This suggested a redistribution of soil Zn from the residual fraction into the exchangeable and organic fractions with acidification. For exchangeable Zn this was further evidenced in the much smaller amounts of Zn extracted by M NH4OAc (pH 7.0) than by M MgCl2 from acid soils. The observed range of total Zn and exchangeable Zn suggests that a wide range of Zn availability could exist in B.C. Interior orchard soils. Key words: Soil Zn, Zn fractionation, orchard soils, pH × exchangeable Zn interaction

IDENTIFICATION OF K DEFICIENCY IN BRITISH COLUMBIA APPLE ORCHARDS

1989 ◽  
Vol 69 (3) ◽  
pp. 715-719 ◽  
Author(s):  
G. H. NEILSEN ◽  
P. B. HOYT ◽  
E. J. HOGUE
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Malus Domestica ◽  
Potassium Deficiency ◽  
Apple Orchards ◽  
Malus Domestica Borkh ◽  
Soil Potassium ◽  
K Deficiency ◽  
First Time ◽  
Orchard Soils

K deficiency was identified for the first time in British Columbia orchard soils. Greenhouse-grown apple seedlings responded to K in soils low in available K. MacSpur McIntosh (Malus domestica Borkh.) had increased leaf K (above deficiency) and improved initial fruiting after surface applications of KCl in an orchard with low soil K. Key words: Potassium deficiency, apple, leaf and soil potassium

Oxidation of elemental sulphur and acidulation of calcareous orchard soils in southern British Columbia

1993 ◽  
Vol 73 (1) ◽  
pp. 103-114 ◽  
Author(s):  
D. Neilsen ◽  
E. J. Hogue ◽  
P. B. Hoyt ◽  
B. G. Drought
Keyword(s):  
Electrical Conductivity ◽  
British Columbia ◽  
Elemental Sulphur ◽  
Sand Content ◽  
Oxidation Rates ◽  
Orchard Soil ◽  
S Oxidation ◽  
Ph Decrease ◽  
Orchard Soils ◽  
Over Time

The capacity of soils to oxidize S was measured by incubation with finely divided elemental S in 13 calcareous orchard soils from the southern interior of British Columbia. Sulphur oxidation rates ranged from 3.4 to 26 μg S cm−2 d−1. The magnitude of pH decrease in response to added S varied inversely with initial CaCO3 content (r = − 0.58, P = 0.04) and silt content (r = − 0.64, P = 0.02) and directly with sand content (r = 0.64, P = 0.02). Incubation studies with one calcareous orchard soil indicated that finely divided S was more effective over time than other acidulants (FeSO4, Al2 (SO4)3 and H2SO4). A field study was carried out on the same soil. Finely divided and bentonitic granulated S were applied at 4.5 t ha−1 on the grass surface or incorporated to a depth of 15 cm. Incorporated fine S was oxidized to a much greater extent during a 2-yr period than was incorporated grandulated S. However, when surface applied, they were oxidized equally but slowly. Key words: S incubation, acidulating materials, S oxidation, soil pH, electrical conductivity

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