Responses of wheat cultivars to time of sowing in the southern wheatbelt of Western Australia

1995 ◽  
Vol 35 (5) ◽  
pp. 579 ◽  
Author(s):  
BJ Shackley ◽  
WK Anderson
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Frost Damage ◽  
Annual Rainfall ◽  
Wheat Cultivars ◽  
Average Decrease ◽  
Terminal Drought ◽  
Sowing Dates ◽  
Crop Development ◽  
Rate Of Decline

Experiments were conducted at 4 locations on an east-west transect in the 300-500 mm average annual rainfall zone in the southern wheatbelt of Western Australia, to determine whether promising crossbreds differ from existing wheat cultivars in their response to time of sowing. Nine cultivars and 2 crossbreds were examined at 3 sowing dates each year, ranging from late April to early July 1989, 1990, and 1991. Grain yield, grain quality (protein, hectolitre weight, grain weight, small grain sievings), crop development, and soil and weather variables were measured. The average decrease in grain yield with delay in sowing after early May was 20 kg/ha.day. All existing wheat cultivars and new crossbreds examined produced their highest yields when sown in early May. Yield decline for the crossbreds and cultivars was almost linear after early May; however, the rate of decline could not be entirely predicted from a knowledge of the crossbreds' maturities. Spear, the cultivar with longest maturity, was one of the highest yielding cultivars when sown in early May or June. The yields of the 2 shortest season cultivars, Kulin and Gutha, were only comparable to the yield of Spear when sown in June. Therefore, in the southern wheatbelt of Western Australia, we do not advise retaining a number of cultivars to suit a range of sowing times. The optimum flowering periods over the 3 seasons were 17 September-7 October in the medium rainfall zone of the southern wheatbelt and 3 September- 23 September in the low rainfall area at the most easterly location, reflecting the importance of terminal drought. There is still a risk of frost damage to wheat crops in about 1 year in 3 for the periods estimated. Therefore some risk of yield loss from frost damage must be accepted if yields are to be maximised.

scholarly journals Pre-anthesis development of winter wheat and barley and relationships with grain yield

2018 ◽  
Vol 64 (No. 7) ◽  
pp. 310-316 ◽  
Author(s):  
Mirosavljevic Milan ◽  
Momcolovic Vojislava ◽  
Maksimovic Ivana ◽  
Putnik-Delic Marina ◽  
Pržulj Novo ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Grain Yield ◽  
Sowing Date ◽  
Wheat Cultivars ◽  
Growing Seasons ◽  
Sowing Dates ◽  
Winter Wheat Cultivars ◽  
Leaf Appearance ◽  
Relationship Of ◽  
The Relationship

The aim of this study was to improve understanding of (1) the effect of genotypic and environmental factors on pre-anthesis development and leaf appearance traits of barley and wheat; (2) the relationship of these factors with grain yield, and (3) the differences between these two crops across different environments/sowing dates. Therefore, trials with six two-row winter barley and six winter wheat cultivars were carried out in two successive growing seasons on four sowing dates. Our study showed that the observed traits varied between species, cultivars and sowing dates. In both growing seasons, biomass at anthesis and grain yield declined almost linearly by delaying the sowing date. There was no clear advantage in grain yield of wheat over barley under conditions of later sowing dates. Generally, barley produced more leaf and had shorter phyllochron than wheat. Both wheat and barley showed a similar relationship between grain yield and different pre-anthesis traits.

Flowering times of wheats in south-western Australia: a modelling approach

1990 ◽  
Vol 41 (2) ◽  
pp. 213 ◽  
Author(s):  
SP Loss ◽  
MW Perry ◽  
WK Anderson
Keyword(s):  
Western Australia ◽  
Rapid Development ◽  
Frost Damage ◽  
Mean Deviation ◽  
Sowing Time ◽  
Developmental Patterns ◽  
Development Patterns ◽  
Sowing Dates ◽  
Independent Observations ◽  
Predicted Values

The time of flowering is important for the yield of wheat crops in south-western Australia, where the risk of frost damage and the onset of drought can occur in the same month. Relationships to predict the time from sowing to flowering were derived by linear regression of duration on mean temperature and photoperiod for 11 cultivars. The models were tested against independent observations of flowering measured in time-of-sowing experiments conducted at five locations over three years. The model accounted for 71-95% of the variation in the independent observations of duration from sowing to flowering. The slopes of the regressions of observed versus predicted values were always less than 1.0, significantly so for four cultivars (P<0.01). The mean deviation of the predicted from the observed varied from 2 to 10 days, depending on the cultivar, site and year. The model was used to examine the effects of seasonal variation, sowing time and location on the flowering times of early, mid-season and semi-winter cultivars in south-western Australia. Predictions over sites, sowing dates and years demonstrated that widely differing developmental patterns may be required to exploit the range of environments and sowing dates in the Western Australian wheatbelt. The durations from sowing to flowering for mid-season and semi-winter cultivars were less affected by the variation in temperature than cultivars with rapid development patterns, and the variation in flowering times between cultivars was smaller at cool locations than at warm sites. The use of the model for farmers and breeders is indicated.

scholarly journals Changes in stem and spike related traits resulting from breeding in Iranian wheat cultivars: associations with grain yield

2017 ◽  
Vol 53 (No. 3) ◽  
pp. 107-113
Author(s):  
M. Joudi ◽  
A. Ahmadi ◽  
V. Mohammadi
Keyword(s):  
Grain Yield ◽  
Selection Criterion ◽  
Dry Weight ◽  
Grain Filling ◽  
Specific Weight ◽  
Indirect Selection ◽  
Wheat Cultivars ◽  
Terminal Drought ◽  
Positive Correlations ◽  
Terminal Drought Stress

This study investigated changes in stem and spike characteristics resulting from breeding in Iranian wheat cultivars, and their relationship with grain yield. Eighty-one wheat cultivars released between 1930 and 2006 were examined under well-watered (WW) and terminal drought stress (DS) conditions in Karaj during 2007–2008 and 2008–2009 and under WW condition at Parsabad in Moghan region during 2010–2011. A genetic improvement over time in stem specific weight (SSW) along with significant positive correlations between this trait and grain yield were found at Karaj under DS conditions and at Parsabad, suggesting that SSW could be used as an indirect selection criterion for yield in these environments. Time-dependent changes in spike dry weight showed that the magnitude of partitioned photoassimilates to the spike during the phase anthesis – 16 days after anthesis (16 DAA) was not changed by breeding. However, during the 16 DAA ‒ maturity phase, modern cultivars had more photoassimilates allocated to the spike than the old ones. This suggests that the sink is more limited during early grain growth than during the end of grain filling. 

Assessment of Drought Tolerance Indices in Bread Wheat Genotypes Under Different Sowing Dates

2012 ◽  
Vol 45 (3) ◽  
pp. 25-39 ◽  
Author(s):  
S. Mohammadi ◽  
M. Janmohammadi ◽  
A. Javanmard ◽  
N. Sabaghnia ◽  
M. Rezaie ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Grain Yield ◽  
High Performance ◽  
Wheat Yield ◽  
Moisture Stress ◽  
Drought Indices ◽  
Terminal Drought ◽  
Sowing Dates ◽  
Moisture Conditions

Abstract The capability of a genotype to achieve acceptable yield over a broad range of sub-optimum and suitable conditions is extremely imperative. Late planting and end-season drought stress are two main factors limiting wheat yield in northwest of Iran. In a 2-year field experiment at Miandoab, Iran, the ability of several selection indices to identify drought resistant genotypes under different sowing dates and moisture conditions were evaluated. Six genotypes of differing response to water scarcity were planted at 20-d intervals on three dates from 11 October to 20 November. Drought resistance indices were utilized on the basis of grain yield under end-season drought (Ys) and normal (YN) conditions. Evaluation of MP, HARM, GM, STI, TOL, SSI, RDI, YSI and Yr indicated that late sowing (20 Nov) significantly decreased drought tolerance in all investigated genotypes. However, yield comparisons under normal and terminal drought stress conditions revealed that promising lines (C-81-4, C-81- 10, C-81-14 and C-82-12) had better performance than local checks (Zarrin and Alvand). Furthermore under both moisture conditions C-81-10 genotype had the greatest grain yield. Based on drought indices like as MP, GMP, STI and HARM C-81-10 genotype introduced as the most tolerant genotype to end-season drought stress. Grain yield showed a positive and significant correlation with HARM, GMP, MP, STI and YI indices were more efficient for recognizing high performance genotypes under different sowing dates and diverse moisture stress.

Evidence for differences between three wheat cultivars in yield response to plant population

1991 ◽  
Vol 42 (5) ◽  
pp. 701 ◽  
Author(s):  
WK Anderson ◽  
J Barclay
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Plant Population ◽  
The Other ◽  
Yield Response ◽  
Small Populations ◽  
Wheat Cultivars ◽  
Optimum Population

Three wheat cultivars were grown at five seed levels in 15 experiments under rain-fed conditions in the central wheatbelt of Western Australia in the 1986, 1987 and 1988 seasons. Guthea (released in 1982, 87 cm tall) required less seed and fewer plants on average to achieve its maximum grain yield than either Gamenya (released in 1960, 82 cm) or Aroona (released in 1981, 73 cm). At sites where Gutha was best adapted its optimum population was 65 plants m-2, about half of the population required by the other two cultivars. At sites where Aroona was best adapted its optimum population was 110 plants m-2. Gutha produced larger ears, especially at small populations, but did not increase kernel numbers per m2 in response to increased populations as much as Aroona. It is suggested that when a new cultivar is released its optimum plant population should be assessed in the area for which it is recommended.

Source - sink balance and manipulating sink - source relations of wheat indicate that the yield potential of wheat is sink-limited in high-rainfall zones

2010 ◽  
Vol 61 (10) ◽  
pp. 852 ◽  
Author(s):  
Heping Zhang ◽  
Neil C. Turner ◽  
Michael L. Poole
Keyword(s):  
Grain Yield ◽  
Western Australia ◽  
Unit Area ◽  
Grain Filling ◽  
Yield Potential ◽  
Limiting Factor ◽  
Wheat Cultivars ◽  
High Rainfall ◽  
Sink Size ◽  
Source Sink

Grain yield depends on the number of grains per unit area (sink) and the availability of assimilates (source) to fill these grains. The aim of the current work was to determine whether wheat yield in the high-rainfall zone of south-western Australia is limited in current cultivars by the size of the sink or by the assimilates available for grain filling. Three wheat cultivars (Calingiri, Chara and Wyalkatchem) and two breeding lines (HRZ216 and HRZ203) were grown in four replicates in the field from 2005 to 2007. Dry matter and water soluble carbohydrates (WSC) at anthesis and maturity were measured and used to determine the source and sink balance of the crop. In 2007, three further treatments were applied to manipulate the sink–source relationships: (i) spikelets were removed on main stems to increase the source : sink ratio; (ii) incoming solar radiation was reduced by 40% by shading after anthesis to reduce the availability of assimilates to grains; and (iii) supplemental irrigation was used to maintain the capacity for photosynthesis by an improved water supply during grain filling. The source–sink balance of the crops showed that the potential source was 25% greater than the actual grain yield in average and above-average seasons (2005 and 2007), suggesting that sink size, represented by the number of grain per unit area, was a limiting factor to yield potential. However, the source may have become a limiting factor in a drought season (2006). The grain yield increased with increased number of grains/m2 and kernel weight remained relatively stable even when grain number increased from 7000 to 16 000 per m2. The removal of half of the spikelets on the main stem did not increase kernel mass of the remaining grains and an additional 33 mm of irrigation water did not increase grain yield, but significantly (P < 0.05) increased WSC left in stems and leaf sheaths at maturity. Shading after anthesis did not significantly reduce grain yield of the current cultivars Calingiri and Wyalkatchem, but it reduced grain yield by 23–25% (P < 0.05) in Chara and HRZ203. The source–sink balance over three seasons and three independent experiments in 2007 suggested that the yield of the current wheat cultivars is more sink- than source-limited and that breeding wheat with a larger sink size than in the current cultivars may lift the yield potential of wheat in the high-rainfall zone of south-western Australia.

scholarly journals Growth, yield and composition of four winter cereals. I. Biomass, grain yield and yield formation

1993 ◽  
Vol 41 (2) ◽  
pp. 153-165 ◽  
Author(s):  
J. Ellen
Keyword(s):  
Grain Yield ◽  
Growth Yield ◽  
Barley Grain ◽  
Cultivar Differences ◽  
Average Decrease ◽  
Winter Cereals ◽  
Crop Development ◽  
Leaf Area Duration ◽  
Closed Canopy ◽  
Yield Formation

A field experiment with 3 cultivars of each of 4 winter cereals (wheat, rye, triticale and barley), sown at about 320 plants/msuperscript 2, was conducted on a fertile clay soil in the central Netherlands. The N fertilizer was split-dressed: 120 kg/ha in total for wheat and triticale, and 60 kg/ha for rye and barley. The fewest shoots/msuperscript 2 were found in triticale (828/msuperscript 2), and the most in barley (1477/msuperscript 2). The average decrease in number of shoots during shoot/ear development was 51% in wheat, 54% in rye, 49% in triticale and 67% in barley. The rate of crop development was largest in rye and barley; they flowered and matured earlier than wheat and triticale. Rye was the first to attain a closed canopy (LAI >3), and had the lowest maximum LAI and shortest leaf area duration. Wheat and triticale stayed green longest. Average specific leaf weight was 4.3 mg/cmsuperscript 2 in wheat and triticale, and 3.7 mg/cmsuperscript 2 in rye and barley. The growth rate of the grains at the linear stage was fastest in barley (1.89 mg grain-1 d-1) and slowest in rye (0.89 mg grain-1 d-1). Total aboveground DM production was 18 790 kg/ha in wheat, 15 230 kg/ha in rye, 18 300 kg/ha in triticale and 12 460 kg/ha in barley. Grain yields (t/ha) were 8.74 (wheat), 6.64 (rye), 8.20 (triticale) and 6.62 (barley). Cultivar differences in grain yield and in yield components were mostly smaller in wheat and rye than in triticale and barley. The harvest index was highest in barley (53.3%) and lowest in rye (43.7%); in some plant species there were marked differences between cultivars, but in others there were not.

scholarly journals Karabuğdayın Yazlık Olarak Isparta Doğal Yağış Koşullarında Farklı Ekim Zamanlarında Yetiştirilme Olanaklarının Araştırılması

2018 ◽  
Vol 6 (1) ◽  
pp. 46 ◽  
Author(s):  
Nimet Kara ◽  
Gökhan Gürbüzer
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Block Design ◽  
Frost Damage ◽  
Damage Effect ◽  
Sowing Time ◽  
Sowing Dates ◽  
Randomized Complete Block Design ◽  
Biological Yield ◽  
Set Up

The study was conducted with aim to investigate growing possibilities without irrigating by taking advantage of spring rains at different sowing times as spring in Isparta conditions. The research was set up as field study during the 2009 and 2010 years according to Randomized Complete Block Design with three replications included six sowing dates 1st March, 10st March, 20th March, 30st March, 9th April and 18st April (control) by using Aktaş buckwheat cultivar. 18st April sowing time was irrigated as control, and the other sowing times was not watered and cultivated depending on natural rains. Buckwheat seeds emergence at 1st and 10st March sowing times, but all the plants after emergence died due to frost damage. Effect of sowing dates on plant height, biological yield and grain yield were statistically significant, and the longest plant height 65.9 cm and 60.0 cm, the highest biological yield 427.3 kg da-1 and 403.7 kg da-1 and grain yield 145.7 kg da-1 and 132.8 kg da-1, respectively, were determined in watered treatment in 18st April in both years (2015 and 2016). Effect of sowing dates on 1000 grain weight, hectoliter weight and protein content were statistically non-significant. It was concluded that buckwheat should be cultivation by watered for Isparta ecological conditions.

scholarly journals Yield components and crop estimation for wheat cultivars at different sowing times

Acta Iguazu ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 62-77
Author(s):  
Lorena Maia Noreto ◽  
Stefanie Lais Kreutz Rosa ◽  
Jorge Luiz Moretti de Souza ◽  
Élcio Silvério Klosowski ◽  
Cláudio Yuji Tsutsumi ◽  
...  
Keyword(s):  
Grain Yield ◽  
Yield Components ◽  
Research Center ◽  
Wheat Cultivars ◽  
Crop Evapotranspiration ◽  
Wheat Grains ◽  
Pests And Diseases ◽  
Sowing Dates ◽  
Yield And Yield Components ◽  
Maturation Stages

The objective of this study was to evaluate the yield and yield components of wheat cultivars, and compare the productivity obtained in the field and estimated with Jensen model, at different sowing dates, in Cascavel and Palotina cities, Parana state, Brazil. The experiments were carried out in the field at the COODETEC Research Center, located in Cascavel and Palotina. The experiment was conducted in a randomized blocks design in a 7 × 3 factorial, with plots consisting of six lines spaced at 5 × 0.17 meters, with seven wheat cultivars and three sowing dates, with three repetitions. The pluvial precipitation higher than crop evapotranspiration in all cultivation cycles analyzed did not prevent water deficiencies, which occurred predominantly in the heading and physiological maturation stages. The smallest water deficiencies in Cascavel (31.2 mm; April 22) and Palotina (7.2 mm; March 31), from sowing to heading, reduced grain yield by 41.7% and 42.8%, respectively, in relation to the higher productivity of each location. Small differences in yield components (NEM, NGE and MMG) provide differences in grain yield between the cultivars tested. The sowing carried out at the end of April and in May tended to have a higher yield. The best performances with Jensen model to estimate wheat grains yield were obtained for CD 1440 and QUARTZO cultivars. The Jensen model overestimated the grain yield of the CD 108, CD 1104, CD 150 and CD 154 cultivars, since the model do not consider losses due to excessive rainfall and/or pests and diseases.

Production practices for high protein, hard wheat in Western Australia

1995 ◽  
Vol 35 (5) ◽  
pp. 589 ◽  
Author(s):  
WK Anderson ◽  
GB Crosbie ◽  
K Lemsom
Keyword(s):  
Western Australia ◽  
Field Experiments ◽  
Grain Filling ◽  
Frost Damage ◽  
High Protein ◽  
Annual Rainfall ◽  
Grain Protein ◽  
Sowing Time ◽  
North Eastern ◽  
Australian Standard

Field experiments were conducted at 18 sites over 4 years in the eastern and north-eastern wheatbelt of Western Australia where average annual rainfall is <400mm, to investigate suitable techniques for the production of high protein (>13%) wheat in an area that traditionally produces grain of a much lower average protein percentage. Wilgoyne yielded as well as, or better than, any of the cultivars accepted into the Special Hard (SH) grade in Western Australia but 5-10% less than cultivars suitable for the Australian Standard White (ASW) grade. Differences between cultivars were greatest at the optimum sowing time in late May. Lower yields in early May were attributed to water stress during early growth or to frost damage during grain filling. The addition of nitrogen (N) fertiliser to crops sown after 1 June was less effective in increasing grain yield and grain protein than N added to earlier sowings. Most crops that produced >13% protein followed medic or field peas. The addition of N fertiliser was seldom required to produce this concentration of protein in crops that followed medic or peas. Crops following pasture with a low legume content or wheat had lower grain protein concentrations. Friable red-brown earth soils in a medic or pea rotation were able to achieve the required grain protein, but other combinations were not extensively tested. From these experiments, cultivars with inherently small grains due to their propensity to produce high levels of small grain screenings (whole grain through a 2-mm, slotted sieve) may be less able to increase yields economically by increasing kernel numbers per unit area under conditions in Western Australia.

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