DENITRIFICATION IN LOWBUSH BLUEBERRY SOILS

1989 ◽  
Vol 69 (2) ◽  
pp. 303-312 ◽  
Author(s):  
LEONARD J. EATON ◽  
DAVID G. PATRIQUIN
Keyword(s):  
Nitrous Oxide ◽  
Organic Matter ◽  
Environmental Variables ◽  
Nitrate Concentration ◽  
Vaccinium Angustifolium ◽  
Lowbush Blueberry ◽  
Key Words Nitrous Oxide ◽  
A Site ◽  
Infertile Soils ◽  
Nitrous Oxide Evolution

Effects of environmental variables on denitrification in acid (pH 4.0–5.5), infertile soils of lowbush blueberry (Vaccinium angustifolium Ait.) stands were investigated under laboratory conditions. All soils produced N2O when nitrate was added and samples were waterlogged and incubated for 2 d at temperatures of 20 °C or greater. No N2O production occurred at temperatures of 15 °C or lower. Nitrous oxide was the main gas evolved at the natural pH levels of these soils. Mercuric chloride inhibited nitrous oxide evolution. Raising soil pH resulted in increased rates of denitrification, and in more conversion of nitrous oxide to dinitrogen. Soil taken from a site that had been fertilized repeatedly exhibited higher rates of N2O evolution than did soil from a site that had never been fertilized. N2O production from waterlogged samples without added nitrate was positively correlated with percent organic matter and nitrate concentration of soils at the time of sampling. In a field experiment, more N2O was produced by samples from fertilized plots than by those from unfertilized plots, but absolute values from both types of plots were low. Key words: Nitrous oxide, pH, nitrate, moisture

EFFECT OF METHOD AND DATE OF PRUNING ON SOIL ORGANIC MATTER AND LEAF NUTRIENT CONCENTRATIONS OF LOWBUSH BLUEBERRIES

1982 ◽  
Vol 62 (3) ◽  
pp. 813-817 ◽  
Author(s):  
ERIC J. HANSON ◽  
AMR. A. ISMAIL ◽  
ROLAND A. STRUCHTEMEYER
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Leaf Tissue ◽  
Growing Season ◽  
Nutrient Concentrations ◽  
Vaccinium Angustifolium ◽  
Tissue Samples ◽  
Lowbush Blueberry ◽  
Leaf Nutrient Concentrations

Lowbush blueberry (Vaccinium angustifolium Ait.) plants were pruned mechanically by flail mowing, or thermally by oil burning in the spring or fall. The pruning treatments had no effect on soil organic matter or pH. Leaf tissue samples taken from burned plants the first growing season after pruning were higher in N and P, but lower in Ca than leaf samples from mowed plants. Leaf tissue samples taken the second growing season following pruning were not influenced by treatments.

Inhibition of Tulane Virus replication via exposure to lowbush blueberry (Vaccinium angustifolium) fractional components

2017 ◽  
Vol 7 (4) ◽  
pp. 281-289 ◽  
Author(s):  
David F. Bridges ◽  
Anna Breard ◽  
Alison Lacombe ◽  
Don C. Valentine ◽  
Shravani Tadepalli ◽  
...  
Keyword(s):  
Virus Replication ◽  
Vaccinium Angustifolium ◽  
Lowbush Blueberry ◽  
Tulane Virus

INORGANIC NITROGEN LEVELS AND NITRIFICATION POTENTIAL IN LOWBUSH BLUEBERRY SOILS

1988 ◽  
Vol 68 (1) ◽  
pp. 63-75 ◽  
Author(s):  
LEONARD J. EATON ◽  
DAVID G. PATRIQUIN
Keyword(s):  
Ammonium Nitrate ◽  
Ammonium Sulfate ◽  
Soil Nitrogen ◽  
Plant Uptake ◽  
Inorganic Nitrogen ◽  
Garden Soil ◽  
Laboratory Studies ◽  
Vaccinium Angustifolium ◽  
Nitrogen Levels ◽  
Lowbush Blueberry

Soil ammonium and nitrate in the top 15 cm of soil were monitored after application of ammonium nitrate and ammonium sulfate to plots at 14 PF (previously fertilized) and 12 NF (never fertilized) lowbush blueberry (Vaccinium angustifolium Ait.) stands representing a range of soil types and management histories. Overall, nitrate values in unfertilized and ammonium sulfate plots were higher at PF than at NF sites, suggesting greater nitrification at PF sites. In laboratory incubation studies, nitrification proceeded immediately in soil from a PF site, but only after a 4-wk lag in that from an adjacent NF site. Nitrification rates were low compared to that in a garden soil (pH 6.6). N-Serve inhibited nitrification in both soils. In ammonium nitrate plots, "excess" N values (N values in fertilized plots minus values in unfertilized plots) were higher for PF than for NF sites, suggesting greater immobilization, plant uptake or loss of N at NF sites. There was no evidence, in laboratory studies, of immobilization of added N by soil from either type of site. Rhizome N concentration increased significantly in response to fertilization at an NF site, but not at a PF site. Key words: Blueberry (lowbush), fertilizer and soil nitrogen

Studies on the flowering biology of red sorrel (Rumex acetosella) ramets from lowbush blueberry (Vaccinium angustifolium) fields in Nova Scotia, Canada

Botany ◽  
2015 ◽  
Vol 93 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Scott N. White ◽  
Nathan S. Boyd ◽  
Rene C. Van Acker ◽  
Clarence J. Swanton
Keyword(s):  
Nova Scotia ◽  
Combined Effects ◽  
Perennial Species ◽  
Weed Species ◽  
Vaccinium Angustifolium ◽  
Perennial Weed ◽  
Flowering Response ◽  
Lowbush Blueberry ◽  
Rumex Acetosella

Red sorrel (Rumex acetosella L.) is a ramet-producing herbaceous creeping perennial species commonly found as a weed in commercially managed lowbush blueberry (Vaccinium angustifolium Aiton) fields in Nova Scotia, Canada. Flowering and seed production occur primarily in overwintering ramets of this species, indicating a potential vernalization requirement for flowering. This study was therefore initiated to examine the role of vernalization, photoperiod, and pre-vernalization stimulus on ramet flowering. Red sorrel ramets propagated from creeping roots and seeds collected from established red sorrel populations in lowbush blueberry had an obligate requirement for vernalization to flower. Ramet populations maintained under pre- and post-vernalization photoperiods of 16 h flowered following 12 weeks of vernalization at 4 ± 0.1 °C, whereas those maintained under constant 16, 14, or 8 h photoperiods without vernalization did not flower. Vernalization for 10 weeks maximized, but did not saturate, the flowering response. Pre-vernalization photoperiod affected flowering response, with increased flowering frequency observed in ramet populations exposed to decreasing, rather than constant, photoperiod prior to vernalization. This study represents the first attempt to determine the combined effects of vernalization and photoperiod on red sorrel flowering, and the results provide a benchmark for the future study of flowering and sexual reproduction in this economically important perennial weed species.

Response of lowbush blueberry (Vaccinium angustifolium) to hexazinone applied early in the fruiting year

2002 ◽  
Vol 82 (4) ◽  
pp. 781-783 ◽  
Author(s):  
K. I. N. Jensen ◽  
E. G. Specht
Keyword(s):  
Key Words ◽  
Weed Control ◽  
Corolla Tube ◽  
Growth Stages ◽  
Vaccinium Angustifolium ◽  
Floral Buds ◽  
Perennial Weeds ◽  
Lowbush Blueberry ◽  
Herbaceous Perennial

Spring application of 1.0 kg ha-1 hexazinone to fruiting-year lowbush blueberry no later than the F3 floral stage, when floral buds separate, but before the corolla tube shows white, controlled some common herbaceous perennial weeds without injury to the crop. Key words: Herbicide injury, growth stages, weed control, hexazinone, Vaccinium angustifolium

Long-term effects of herbicide and fertilizers on lowbush blueberry growth and production

1994 ◽  
Vol 74 (2) ◽  
pp. 341-345 ◽  
Author(s):  
Leonard J. Eaton
Keyword(s):  
Reproductive Development ◽  
Fresh Fruit ◽  
Long Term Effects ◽  
Vaccinium Angustifolium ◽  
Nitrogen Levels ◽  
Lowbush Blueberry ◽  
Production Cycles ◽  
Npk Fertilizer ◽  
Vegetative And Reproductive Growth

Effects of herbicide and herbicide-fertilizer combinations on vegetative and reproductive growth of the lowbush blueberry (Vaccinium angustifolium Ait.) were assessed over a 12-yr period (six production cycles). All treatments stimulated stem lengths, fruit buds per stem and fresh fruit yields compared with untreated controls, but only after 3–6 yr. After the second cycle, stem lengths and fruit bud numbers were greater in herbicide + NPK-treated plants than in all others. Fresh fruit yields were variable throughout the study but were higher in herbicide and herbicide + fertilizer plots than in untreated controls after 1982, except in 1988. Nitrogen levels were greater in leaves and rhizomes of plants in all herbicide and herbicide + fertilizer plots than in control plots after 10 yr, whereas phosphorus was higher only in plants fertilized with NPK. These results suggest the lowbush blueberry responds slowly to herbicide and fertilizer applications. Increased vegetative and reproductive development, as well as denser plant stands, resulted from repeated herbicide and fertilizer applications. Fertilizers applied in conjunction with herbicides stimulate vegetative growth (and fruit buds if an NPK fertilizer), but appear to have no consistent effect on fresh fruit yields. Key words:Vaccinium angustifolium, fertilizer, herbicide, fruit buds, yield

Models of the distribution and abundance of ground-dwelling mammals in the eucalypt forests of north-eastern New South Wales in relation to environmental variables

2002 ◽  
Vol 29 (3) ◽  
pp. 313 ◽  
Author(s):  
P. C. Catling ◽  
R. J. Burt ◽  
R. I. Forrester
Keyword(s):  
Environmental Variables ◽  
New South ◽  
New South Wales ◽  
Slope Position ◽  
Slope Aspect ◽  
Significant Variable ◽  
South Wales ◽  
North Eastern ◽  
Eucalypt Forests ◽  
A Site

Statistical models are presented of the distribution and abundance of ground-dwelling mammals in eucalypt forests in relation to environmental variables within an area of approximately 24 000 km2 in north-eastern New South Wales. Environmental variables are defined as climatic or topographic variables that may be useful to map the distribution of fauna. The environmental variables examined were season, temperature, rainfall, elevation, lithology, steepness of slope, position on slope, aspect and landform profile. The probability of recording some species was higher in spring than autumn and many species were in highest abundance in areas of low temperature (high elevation). Although aspect was a significant variable in a number of models, no species was absent from any aspect category. Mid-slopes down to and including creeks and drainage lines were particularly important for many species, as were areas with flatter terrain. Although we have modelled environmental variables only there will no doubt be longer-term interactions between habitat and environmental variables. Fundamentally, environmental variables will determine the type of habitat present at a site, and the distribution of canopy communities, at least, can be predicted from environmental variables. However, other studies have shown for ground-dwelling mammals that environmental variables contribute little and it is the state of the habitat locally, and particularly the understorey, that determines their presence and abundance at a site. The results are discussed in relation to similar models using habitat variables and in relation to the use of such models in the management of ground-dwelling fauna in forests.

Vaccinium angustifolium (lowbush blueberry) leaf extract increases extravillous trophoblast cell migration and invasion in vitro

2018 ◽  
Vol 32 (4) ◽  
pp. 705-714 ◽  
Author(s):  
Christina Ly ◽  
Jonathan Ferrier ◽  
Jeremiah Gaudet ◽  
Julien Yockell-Lelièvre ◽  
John Thor Arnason ◽  
...  
Keyword(s):  
Cell Migration ◽  
Leaf Extract ◽  
Trophoblast Cell ◽  
Extravillous Trophoblast ◽  
Migration And Invasion ◽  
Vaccinium Angustifolium ◽  
Cell Migration And Invasion ◽  
Lowbush Blueberry
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