ADVERSE INFLUENCE OF AWNS ON YIELD OF WHEAT

1972 ◽  
Vol 52 (1) ◽  
pp. 81-87 ◽  
Author(s):  
HUGH McKENZIE
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Unit Area ◽  
Growing Season ◽  
Triticum Aestivum L ◽  
Spike Count ◽  
Southern Alberta ◽  
Moisture Supply ◽  
Adverse Influence

Reciprocal backcrosses between two spring wheat (Triticum aestivum L. em. Thell) cultivars, awned Lee and awnletted Thatcher, provided "awnletted" Lee lines and "awned" Thatcher lines. Comparisons between yields of the awned and awnletted forms of the two cultivars at several locations in southern Alberta over a 4-year period showed a relation between awnedness and yield. The awnletted form generally was superior to the awned in yield. This finding contrasts with findings in most previous studies where the awned forms outyielded the awnless and awnletted ones. Moisture supply during the growing season did not influence the effect of awnedness on yield. Plumpness of kernels, contrary to the findings of some previous investigators, was not associated with awnedness. Differences in kernel count per spike were slight between the awned and awnletted pairs. Spike count per unit area was greater for the "awnletted" than for the awned Lee lines but was not different between the awnletted and "awned" Thatcher pairs.

Efficacy of inorganic fertilizers in restoring wheat yields on artificially eroded soils

1995 ◽  
Vol 75 (3) ◽  
pp. 369-377 ◽  
Author(s):  
Francis J. Larney ◽  
H. Henry Janzen ◽  
Barry M. Olson
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Agricultural Land ◽  
Triticum Aestivum L ◽  
Soil Restoration ◽  
Soil Productivity ◽  
Chemical Fertilizers ◽  
Straw Yield ◽  
Southern Alberta ◽  
P Rate

Chemical fertilizers are often used to amend eroded agricultural land. However, the relationships between level of erosion, nitrogen (N) rate and phosphorus (P) rate in restoring soil productivity are unclear. In 1990, experiments were initiated to examine the effect of three levels of erosion (0, 10 and 20 cm of topsoil removal to simulate non-eroded, moderately eroded and severely eroded soils), four rates of N and three rates of P on the performance of spring wheat (Triticum aestivum L.) for four southern Alberta soils. Residual erosion and fertilizer effects were assessed in a second cropped year. Erosion significantly decreased grain and straw yield at all four sites in the initial year. Removing 10 and 20 cm of topsoil reduced non-fertilized production by 43–66% and 60–85%, respectively, as compared with the undisturbed non-fertilized plots. Except for one site in the initial year, additions of N and P only partly remedied these losses. Responses to N and P were highest at moderate levels of erosion at three sites. There was a greater yield overlap between moderately and severely eroded treatments than between non-eroded and moderately eroded treatments, implying that the restoration of productivity is more difficult once the shallowest layer of topsoil has been removed. Key words: Simulated erosion, wheat, inorganic fertilizer, soil restoration

Effects of nitrogen fertilization on grain protein content, nitrogen uptake, and nitrogen use efficiency of six spring wheat (Triticum aestivum L.) cultivars, in relation to estimated moisture supply

1992 ◽  
Vol 72 (1) ◽  
pp. 235-241 ◽  
Author(s):  
L. E. Gauer ◽  
C. A. Grant ◽  
L. D. Bailey ◽  
D. T. Gehl
Keyword(s):  
Triticum Aestivum ◽  
Protein Content ◽  
Spring Wheat ◽  
Nitrogen Fertilization ◽  
N Uptake ◽  
Triticum Aestivum L ◽  
Nitrogen Use ◽  
Moisture Supply ◽  
Use Efficiency ◽  
N Use

The effects of nitrogen fertilization on protein content, N uptake and N use efficiency of grain for six spring wheat cultivars were evaluated over a N application range of 0–200 kg ha−1, under two moisture supply levels, on Black Chernozemic soils in Manitoba. Moisture supply influenced protein content, protein yield, and grain N use efficiency (NUE) of applied fertilizer. Increased moisture supply lowered protein content and increased protein yield and NUE. Increasing N level increased protein, N uptake and decreased NUE, but effects depended on moisture supply. Cultivar differences occurred, especially at the higher moisture level.Key words: Protein, Triticum aestivum L., nitrogen uptake, nitrogen use efficiency, moisture

In-soil banded versus post-seeding liquid nitrogen applications in no-till spring wheat and canola

2007 ◽  
Vol 87 (2) ◽  
pp. 223-232 ◽  
Author(s):  
C. B. Holzapfel ◽  
G. P. Lafond ◽  
S. A. Brandt ◽  
W. E. May ◽  
A. M. Johnston
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Plant Density ◽  
Growing Season ◽  
Triticum Aestivum L ◽  
N Fertilization ◽  
Brassica Napus L ◽  
Surface Band ◽  
No Till ◽  
Urea Ammonium Nitrate

Delaying nitrogen (N) applications into the growing season as a risk management tool is a concept that has received considerable attention in recent years. A 3-yr field study with spring wheat (Triticum aestivum L.) and canola (Brassica napus L.) was conducted at two Saskatchewan locations, Indian Head and Scott. The effects of postponing N applications for up to 30 d after seeding and several application methods were evaluated against mid-row banded urea at seeding. Liquid urea ammonium-nitrate (UAN) was applied at four separate times relative to seeding, either as an in-soil coulter band or a surface band. The surface band applications were applied either with or without the addition of 5% ammonium thiosulphate (ATS), a potential urease inhibitor. The dependent variables considered included plant density and grain yield for both crops, and grain protein in wheat. The only effect on plant density occurred in canola, where the post-seeding coulter applications slightly reduced stands compared with the other treatments. Postponing N fertilization for up to 30 d after seeding compared with N fertilization at seeding did not affect the yield of canola or protein in spring wheat, but reduced the yield of spring wheat at Indian Head in 2003, which was a very dry growing season. The coulter applications only showed a slight advantage over the surface band applications. For the surface band applications, the addition of 5% ATS did not provide a noticeable advantage over UAN alone. Canola appeared to be less sensitive to post-seeding applications than spring wheat. Deferring the entire amount of fertilizer N into the growing season appears to be a viable option but it is not without risk, especially when dry conditions are encountered. Key words: Triticum aestivum L., Brassica napus L., nitrogen management, no-till, surface dribble, urea-ammonium nitrate

Does Elevated CO2 Protect Grain Yield of Wheat from the Effects of Ozone Stress?

1999 ◽  
Vol 54 (9-10) ◽  
pp. 802-811 ◽  
Author(s):  
Alison Donnelly ◽  
Michael B. Jones ◽  
James I. Burkeb ◽  
Bert Schnieders
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Spring Wheat ◽  
Growing Season ◽  
Triticum Aestivum L ◽  
Interactive Effects ◽  
Wheat Crop ◽  
Ozone Stress ◽  
Timing Of Exposure ◽  
Damaging Effects

This study has investigated the effects of elevated CO2 and elevated O3, both singly and in combination, on the yield of spring wheat (Triticum aestivum L., cv. Minaret). Plants were grown in open-top chambers and exposed to three CO2 concentrations (ambient, 510 and 680 ppmv) and two O3 concentrations (ambient and ambient +50 or +90 ppbv) either from anthesis onwards or for the full growing season. To date, experiments that have investigated the interactive effects of these gases have shown a variety of responses, ranging from an amelioration of the damaging effects of high O3 to a greater sensitivity to O3 at elevated CO2. The effects on grain yield and yield com ponents were determined. Our results confirm that elevated CO2 provides some protection to a wheat crop against the damaging effects of O3 on grain yield. However, the level of protection varies from one growing season to the next and also appears to be related particularly to the timing of exposure to elevated O3

scholarly journals Mapping quantitative trait loci associated with common bunt resistance in a spring wheat (Triticum aestivum L.) variety Lillian

2019 ◽  
Vol 132 (11) ◽  
pp. 3023-3033 ◽  
Author(s):  
Firdissa E. Bokore ◽  
Richard D. Cuthbert ◽  
Ron E. Knox ◽  
Arti Singh ◽  
Heather L. Campbell ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Quantitative Trait Loci ◽  
Spring Wheat ◽  
Quantitative Trait ◽  
Triticum Aestivum L ◽  
Common Bunt ◽  
Trait Loci ◽  
Bunt Resistance

Biggar red spring wheat

1991 ◽  
Vol 71 (2) ◽  
pp. 519-522 ◽  
Author(s):  
R. M. DePauw ◽  
K. R. Preston ◽  
T. F. Townley-Smith ◽  
E. A. Hurd ◽  
G. E. McCrystal ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Yield Potential ◽  
High Yield ◽  
Flour Milling ◽  
Wide Adaptation ◽  
Cultivar Description ◽  
End Use ◽  
Milling Properties

Biggar red spring wheat (Triticum aestivum L.) combines high grain yield potential with semidwarf stature and wide adaptation. Biggar has improved end-use suitability relative to HY320 such as harder kernels, better flour milling properties, greater water absorption, and stronger gluten properties. It received registration No. 3089 and is eligible for grades of Canada Prairie Spring (red). Key words: Triticum aestivum, wheat (spring), high yield, cultivar description

EFFECTS OF INCREMENTAL N FERTILIZATION ON GRAIN YIELD AND DRY MATTER ACCUMULATION OF SIX SPRING WHEAT (Triticum aestivum L.) CULTIVARS IN SOUTHERN MANITOBA

1990 ◽  
Vol 70 (1) ◽  
pp. 51-60 ◽  
Author(s):  
D. T. GEHL ◽  
L. D. BAILEY ◽  
C. A. GRANT ◽  
J. M. SADLER
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Spring Wheat ◽  
Dry Matter ◽  
Root Zone ◽  
Temporal Distribution ◽  
Triticum Aestivum L ◽  
N Fertilization ◽  
Yield Response ◽  
Dry Matter Accumulation

A 3-yr study was conducted on three Orthic Black Chernozemic soils to determine the effects of incremental N fertilization on grain yield and dry matter accumulation and distribution of six spring wheat (Triticum aestivum L.) cultivars. Urea (46–0–0) was sidebanded at seeding in 40 kg N ha−1 increments from 0 to 240 kg ha−1 in the first year and from 0 to 200 kg ha−1 in the 2 subsequent years. Nitrogen fertilization increased the grain and straw yields of all cultivars in each experiment. The predominant factor affecting the N response and harvest index of each cultivar was available moisture. At two of the three sites, 91% of the interexperiment variability in mean maximum grain yield was explained by variation in root zone moisture at seeding. Mean maximum total dry matter varied by less than 12% among cultivars, but mean maximum grain yield varied by more than 30%. Three semidwarf cultivars, HY 320, Marshall and Solar, had consistently higher grain yield and grain yield response to N than Glenlea and Katepwa, two standard height cultivars, and Len, a semidwarf. The mean maximum grain yield of HY 320 was the highest of the cultivars on test and those of Katepwa and Len the lowest. Len produced the least straw and total dry matter. The level of N fertilization at maximum grain yield varied among cultivars, sites and years. Marshall and Solar required the highest and Len the lowest N rates to achieve maximum grain yield. The year-to-year variation in rates of N fertilization needed to produce maximum grain yield on a specific soil type revealed the limitations of N fertility recommendations based on "average" amounts and temporal distribution of available moisture.Key words: Wheat (spring), N response, standard height, semidwarf, grain yield

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