Optimising canola establishment and yield in south-eastern Australia with hybrids and large seed

2016 ◽  
Vol 67 (4) ◽  
pp. 409 ◽  
Author(s):  
R. D. Brill ◽  
M. L. Jenkins ◽  
M. J. Gardner ◽  
J. M. Lilley ◽  
B. A. Orchard
Keyword(s):  
Grain Yield ◽  
Seed Size ◽  
Biomass Accumulation ◽  
Simulation Modelling ◽  
Sowing Depth ◽  
Large Seed ◽  
South Wales ◽  
Eastern Australia ◽  
Series Of Experiments ◽  
Seed Characteristics

April sowing of canola is considered optimal for grain yield in many regions of Australia; however, there is often insufficient rainfall in April to sow seed into moisture at the ideal depth of 15–30 mm. We report a series of experiments that investigated the seed characteristics (cultivar type and seed size) that would facilitate successful canola emergence from relatively deep sowing (>30 mm). Ten canola cultivar by sowing depth experiments, each with three hybrid and three open-pollinated cultivars, found hybrid cultivars were able to maintain higher emergence rates and grain yield compared with open-pollinated cultivars from deep sowing. Further investigations in the glasshouse showed that the emergence advantage of the hybrid cultivars was largely due to their inherently large seed size, as increased seed size also improved emergence of open-pollinated canola. Early biomass accumulation also improved with larger seeds. In a field experiment, larger seed size of both hybrid and open-pollinated canola increased early biomass accumulation and final grain yield. Simulation modelling in New South Wales demonstrated the importance of timely sowing of canola, as delayed sowing caused a larger reduction in grain yield than reduced plant population. Although ‘moisture-seeking’ (placing seed into moist soil below a layer of dry soil) reduced the emergence rate of canola, the reduction could be offset by planting large seed (>2 mm diameter). This practice of ‘moisture-seeking’ large-seeded canola should be considered as a strategy to improve the timeliness of establishment and subsequent grain yield of canola when rainfall for crop establishment is marginal yet there is moisture available deeper in the seedbed.

scholarly journals Planting Depth and Seed Size Affect Edamame Emergence Individually

HortScience ◽  
2019 ◽  
Vol 54 (1) ◽  
pp. 92-94 ◽  
Author(s):  
Laura E. Crawford ◽  
Martin M. Williams
Keyword(s):  
Experimental Design ◽  
Seed Size ◽  
Field Experiments ◽  
Commercial Production ◽  
Planting Depth ◽  
Size Classes ◽  
Large Seed ◽  
Small Seed ◽  
Split Plot ◽  
Seed Characteristics

Edamame growers currently rely heavily on planting depth recommendations for grain-type soybean, despite stark differences in seed characteristics between the two types of cultivars, most notably seed size. Therefore, the objective of the study was to determine the effects of planting depth and seed size on edamame emergence. A popular edamame cultivar used in commercial production was sorted into “small” (23.7 g/100-seed) and “large” (36.8 g/100-seed) seed-size classes, then planted at depths of 1.0, 2.0, 3.0, and 5.0 cm in field experiments. Experiments were conducted in four environments as a split-plot experimental design with four replications. Seed size did not influence total emergence; however, small seed emerged 10% faster than large seed. Although planting depth recommendations for grain-type soybean are 3.2 to 4.5 cm, our results showed edamame emerged more completely and quicker at the shallowest depths examined. The research could be expanded to capture greater diversity in growing environments and crop cultivars; however, the vegetable industry now has research-based information to guide preliminary recommendations regarding appropriate planting depth of edamame.

Effects of sowing depth on field emergence of soybeans

1979 ◽  
Vol 19 (101) ◽  
pp. 719 ◽  
Author(s):  
LW Banks ◽  
AR Gilmour
Keyword(s):  
Seed Size ◽  
Clay Soil ◽  
New South ◽  
Germination Percentage ◽  
The Other ◽  
Near Isogenic Lines ◽  
Hypocotyl Length ◽  
Sowing Depth ◽  
South Wales ◽  
Field Emergence

The effect of sowing depth on the field emergence of soybeans was studied at Trangie, New South Wales, in a grey self-mulching clay soil. Eight varieties were used in 1976 and six varieties (including 3 near-isogenic lines differing only in seed size) were used in 1977. Seeds were sown at 2, 4, 6, 8, 10 and 12 cm depths and the number emerged was recorded daily. Field germination percentages and hypocotyl length were recorded 10 and 14 days after sowing. The results suggest that 4 to 6 cm is the most reliable sowing depth. Emergence was reduced and delayed by deeper sowings, and insufficient soil moisture reduced germination percentage at shallow sowings in 1976. Mean hypocotyl length increased with sowing depth, but only exceeded sowing depth at the shallowest sowings (2 and 4 cm). The varieties differed in emergence percentages, with Ruse being lowest and Forrest highest. Also, Ruse had shorter hypocotyls than the other varieties. Seed size did not influence emergence or hypocotyl length.

Germination ecology of six species of Eucalyptus in shrink–swell vertosols: moisture, seed depth and seed size limit seedling emergence

2017 ◽  
Vol 65 (1) ◽  
pp. 22 ◽  
Author(s):  
Lorena Ruiz Talonia ◽  
Nick Reid ◽  
Caroline L. Gross ◽  
R. D. B. Whalley
Keyword(s):  
Soil Moisture ◽  
Seed Size ◽  
Seedling Emergence ◽  
Seed Viability ◽  
Direct Seeding ◽  
Eucalyptus Species ◽  
Sowing Depth ◽  
South Wales ◽  
Dry Conditions ◽  
Moisture Conditions

We examined the potential of direct-seeding Eucalyptus species to revegetate the vertosol (‘cracking clay’) soils that characterise the floodplains of north-western New South Wales. We investigated the influence of sowing depth (0, 6, 12 and 20 mm) and three soil-moisture scenarios (dry, moist and flooded) on seedling emergence of seedlings of six species of Eucalyptus with a range of seed sizes (E. blakelyi, E. camaldulensis, E. melanophloia, E. melliodora, E. pilligaensis and E. populnea). We used cracking clay soil from the region in a glasshouse environment. Seedling emergence was low despite high seed viability and provision of optimum temperatures and soil moisture conditions. All six species exhibited greatest emergence when sown at 0–6-mm depth, with seed size being less important than moisture (except under dry conditions) and proximity to the surface. Species responded differently to the three watering treatments. Eucalyptus melanophloia exhibited greatest emergence in the ‘dry’ watering treatment. The floodplain species, E. camaldulensis, E pilliganesis and E. populnea, had the greatest emergence under flood conditions. Eucalyptus blakelyi and E. melliodora exhibited intermediate emergence in relation to all three soil-moisture regimes. Although the direct seeding of these species in vertosol soils in the region may be successful on occasion, windows of opportunity will be infrequent and the planting of seedling tubestock will be more reliable for revegetation.

SELECTION FOR GRAIN YIELD OF SPRING WHEAT UTILIZING SEED SIZE AND OTHER SELECTION CRITERIA

1987 ◽  
Vol 67 (3) ◽  
pp. 605-610 ◽  
Author(s):  
H. G. NASS
Keyword(s):  
Grain Yield ◽  
Seed Size ◽  
Spring Wheat ◽  
Harvest Index ◽  
Relative Effectiveness ◽  
Triticum Aestivum L ◽  
Selection Methods ◽  
Large Seed ◽  
Study Selection ◽  
Selection For

Four selection procedures, to include random selection, visual head selection by two selectors, selection for large seed size, and harvest index, respectively, were evaluated for relative effectiveness in selecting high-yielding plants in F2 and F3 populations of three crosses of spring wheat (Triticum aestivum L.). Twenty-five F4-derived lines of the three crosses for each selection method were evaluated for yield performance during 2 yr of study. Selection for large seed size and visual head selection produced more late-heading, tall or high-yielding plants than the other selection methods. A larger number of F4-derived lines in the top yielding 5% and 25% within each cross was chosen by visual selection and by selection for large seed size.Key words: Selection methods, seed size, harvest index, grain yield, spring wheat, visual head selections

scholarly journals Impact of Sowing Time on Chickpea (Cicer arietinum L.) Biomass Accumulation and Yield

Agronomy ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 160
Author(s):  
Mark F. Richards ◽  
Lancelot Maphosa ◽  
Aaron L. Preston
Keyword(s):  
Grain Yield ◽  
Biomass Accumulation ◽  
Yield Component ◽  
Wagga Wagga ◽  
Sowing Time ◽  
Location Data ◽  
Growing Seasons ◽  
South Wales ◽  
Sowing Dates ◽  
One Year

Chickpea growth, development and grain yield are affected by a range of climatic and environmental factors. Experiments were conducted across four sowing dates from mid-April to the end of May, over two years at Trangie in central western New South Wales (NSW), and Leeton, Wagga Wagga and Yanco (one year) in southern NSW, to examine the influence of sowing time on biomass accumulation, grain yield and plant yield components. Climatic and experimental location data were recorded during the growing seasons. Early sowing (mid-April) resulted in taller plants, higher bottom and top pod heights, fewer pods, more unfilled pods and greater biomass accumulation, but low harvest index due to reduced grain yield compared with late sowing (end of May). Grain number was positively correlated with grain yield and was the main yield component accounting for most of the variation in yield. There was largely a positive correlation between biomass and yield, especially with delayed sowing except for Leeton experiments. This study concludes that sowing around the end of April in central western NSW and mid-May in southern NSW is conducive to higher grain yield as it minimises exposure to abiotic stresses at critical growth periods and allows efficient conversion of biomass to grain yield.

Quality and potential utility of ENSO-based forecasts of spring rainfall and wheat yield in south-eastern Australia

2008 ◽  
Vol 59 (2) ◽  
pp. 112 ◽  
Author(s):  
M. R. Anwar ◽  
D. Rodriguez ◽  
D. L. Liu ◽  
S. Power ◽  
G. J. O'Leary
Keyword(s):  
Grain Yield ◽  
Production Systems ◽  
Southern Oscillation ◽  
Wheat Yield ◽  
Good Reliability ◽  
South Eastern ◽  
South Wales ◽  
Eastern Australia ◽  
South Eastern Australia

Reliable seasonal climate forecasts are needed to aid tactical crop management decisions in south-eastern Australia (SEA). In this study we assessed the quality of two existing forecasting systems, i.e. the five phases of the Southern Oscillation Index (SOI) and a three phase Pacific Ocean sea-surface temperatures (SSTs), to predict spring rainfall (i.e. rainfall from 1 September to 31 November), and simulated wheat yield. The quality of the forecasts was evaluated by analysing four attributes of their performance: their reliability, the relative degree of shift and dispersion of the distributions, and measure of forecast consistency or skill. Available data included 117 years of spring rainfall and 104 years of grain yield simulated using the Agricultural Production Systems Simulator (APSIM) model, from four locations in SEA. Average values of spring rainfall were 102–174 mm with a coefficient of variation (CV) of 47%. Average simulated wheat yields were highest (5609 kg/ha) in Albury (New South Wales) and lowest (1668 kg/ha) in Birchip (Victoria). The average CV for simulated grain yields was 36%. Griffith (NSW) had the highest yield variability (CV = 50%). Some of this year-to-year variation was related to the El Niño Southern Oscillation (ENSO). Spring rainfall and simulated wheat yields showed a clear association with the SOI and SST phases at the end of July. Important variations in shift and dispersion in spring rainfall and simulated wheat yields were observed across the studied locations. The forecasts showed good reliability, indicating that both forecasting systems could be used with confidence to forecast spring rainfall or wheat yield as early as the end of July. The consistency of the forecast of spring rainfall and simulated wheat yield was 60–83%. We concluded that adequate forecasts of spring rainfall and grain yield could be produced at the end of July, using both the SOI and SST phase systems. These results are discussed in relation to the potential benefit of making tactical top-dress applications of nitrogen fertilisers during early August.

Grain protein responses to nitrogen applied to wheat growing on a red earth

1991 ◽  
Vol 42 (5) ◽  
pp. 735 ◽  
Author(s):  
JF Angus ◽  
RA Fischer
Keyword(s):  
Ammonium Nitrate ◽  
Theoretical Background ◽  
Yield Response ◽  
Grain Protein ◽  
Fertilizer N ◽  
South Wales ◽  
Eastern Australia ◽  
Red Earth ◽  
Subsequent Crop ◽  
Urea Ammonium Nitrate

Dryland wheat was fertilized with ammonium nitrate or liquid urea-ammonium nitrate at the time of sowing or about 3 months later (generally at the terminal-spikelet stage) on a well-drained site near Harden on the south-west slopes of New South Wales. The experiments continued from the second to the fifth year (1981-1984) of the cropping phase of a crop-pasture rotation. The maximum agronomic efficiencies for yield in the four consecutive years were 19, 4, 23 and 25 kg grain per kg of applied nitrogen (N). The three large responses were obtained in wetter than average seasons and the small response was obtained during drought. In the last three years of the study the yield response to nitrogen at the terminal-spikelet stage was found to be close to but slightly less than that for N applied at sowing. In those years the agronomic efficiencies for the late-applied N were 0, 22 and 22. The apparent recovery of fertilizer N in the above-ground parts of the crop at maturity was up to 70% of the fertilizer applied in the year of sowing, and, after the drought during which there was little uptake of fertilizer N, up to 62% by the subsequent crop. The fertilizer efficiencies in the non-drought years were higher than generally reported in south-eastern Australia, and indicate potential for profitable delayed application of N fertilizer to wheat. Grain-protein responses were variable from year to year and are discussed against a simple theoretical background of the amount of N applied and grain-yield response.

Evidence of High Sea Level during Isotope Stage 5c in Queensland, Australia

1985 ◽  
Vol 24 (1) ◽  
pp. 103-114 ◽  
Author(s):  
J. W. Pickett ◽  
C. H. Thompson ◽  
R. A. Kelley ◽  
D. Roman
Keyword(s):  
Sea Level ◽  
New South ◽  
Good Condition ◽  
Coastal Dunes ◽  
Intertidal Sediments ◽  
South Wales ◽  
Eastern Australia ◽  
Maximum Period ◽  
High Dune

Thirty-nine species of scleractinian corals have been recovered from under a high dune on the western (mainland) side of North Stradbroke Island, eastern Australia. The corals are associated with thin intertidal sediments and their good condition implies burial in situ and preservation in a saturated zone. Most likely this occurred as the coast prograded and a large dune advanced into the littoral zone, burying intertidal sediments and coral. The species assemblage indicates a sheltered environment but one open to the ocean without wide fluctuations in salinity. Three species yielded a mean 230Th/234U age of 105,000 yr B.P. which is significantly younger than the nearest Pleistocene corals at Evans Head, New South Wales. The corals provide evidence of a sea stand near present sea level during isotope Stage 5c, which is considerably higher than previously suggested for this period. Their good condition implies that the overlying parabolic dune is of comparable age and formed during that high stand of sea level. Also, the isotope age provides a maximum period for the development of giant podzols in the podzol chronosequences on coastal dunes in southern Queensland.

scholarly journals Potential yield of soybean promising lines in acid soil of Central Lampung, Indonesia

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Heru Kuswantoro
Keyword(s):  
Grain Yield ◽  
Seed Size ◽  
Seed Yield ◽  
Soil Ph ◽  
Acid Soil ◽  
Potential Yield ◽  
Climate Conditions ◽  
Check Variety ◽  
Similar Soil

Most of Indonesia dryland is covered by acid soil which lead to the decreasing potential yield of the crops. In different areas soybean potential yield also different depends on the different soil pH and the availability of the soil. The objective of the research was to study the potential yield of soybean promising lines in acid soil of Central Lampung, Indonesia. Ten promising lines and two check varieties (Tanggamus and Wilis) were grown in acid soil with pH 4.7. The results showed that the highest seed yield was showed by SC5P2P3.5.4.1-5 with 2.51 t/ha. Other soybean promising lines with seed yield over than 2 t/ha-1 was SJ-5/Msr.99.5.4.5-1-6-1 and the check variety Tanggamus. The highest yield of SC5P2P3.5.4.1-5 was caused by the high number of filled pods and the large of seed size. Other nine promising lines also can be developed to obtained grain yield as many as Tanggamus yield in the area with similar soil and climate conditions.

Forage and grain yield of grazed or defoliated spring and winter cereals in a winter-dominant, low-rainfall environment

2015 ◽  
Vol 66 (4) ◽  
pp. 308 ◽  
Author(s):  
Alison. J. Frischke ◽  
James R. Hunt ◽  
Dannielle K. McMillan ◽  
Claire J. Browne
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Cereal Crops ◽  
Grain Production ◽  
Forage Production ◽  
Dual Purpose ◽  
Winter Cereals ◽  
Yield And Quality ◽  
Eastern Australia ◽  
Grain Yield And Quality

In the Mallee region of north-western Victoria, Australia, there is very little grazing of crops that are intended for grain production. The success of dual-purpose crops in other regions in south-eastern Australia with higher and more evenly distributed rainfall has driven interest in assessing the performance of dual-purpose cereals in the region. Five experiments were established in five consecutive years (2009–13) in the southern Mallee to measure the forage production and grain yield and quality response in wheat and barley to grazing by sheep or mechanical defoliation. The first three experiments focused on spring cultivars sown from late April to June, and the last two on winter cultivars planted from late February to early March. Cereal crops provided early and nutritious feed for livestock, with earlier sowing increasing the amount of dry matter available for winter grazing, and barley consistently produced more dry matter at the time of grazing or defoliation than wheat. However, the grain-production response of cereals to grazing or defoliation was variable and unpredictable. Effects on yield varied from –0.7 to +0.6 t/ha, with most site × year × cultivar combinations neutral (23) or negative (14), and few positive (2). Changes in grain protein were generally consistent with yield dilution effects. Defoliation increased the percentage of screenings (grains passing a 2-mm sieve) in three of five experiments. Given the risk of reduced grain yield and quality found in this study, and the importance of grain income in determining farm profitability in the region, it is unlikely that dual-purpose use of current cereal cultivars will become widespread under existing grazing management guidelines for dual-purpose crops (i.e. that cereal crops can be safely grazed once anchored, until Zadoks growth stage Z30, without grain yield penalty). It was demonstrated that early-sown winter wheat cultivars could produce more dry matter for grazing (0.4–0.5 t/ha) than later sown spring wheat and barley cultivars popular in the region (0.03–0.21 t/ha), and development of regionally adapted winter cultivars may facilitate adoption of dual-purpose cereals on mixed farms.

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