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 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.

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.

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 Effect of sowing time on growth and yield attributes of three mustard cultivars grown in Tidal Floodplain of Bangladesh

2017 ◽  
Vol 14 (2) ◽  
pp. 155-160
Author(s):  
MAR Sharif ◽  
MZ Haque ◽  
MHK Howlader ◽  
MJ Hossain
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Dry Matter ◽  
Growth And Yield ◽  
Index Number ◽  
Sowing Time ◽  
Area Index ◽  
Yield Attributes ◽  
Sowing Dates ◽  
1000 Grain Weight

The experiment was conducted at the field laboratory of the Patuakhali Science and Technology University, Patuakhali, Bangladesh during the period from November, 2011 to March 2012 under the tidal Floodplain region to find out optimum sowing time for the selected three cultivars (BARI Sharisha-15, BINA Sharisha-5 and BARI Sharisha-9). There were four sowing dates viz. 30 November, 15 December, 30 December and 15 January. Significant variations due to different sowing dates were observed in plant height, total dry matter, leaf area index, number of siliqua plant-1, seeds silique-1, 1000-grain weight, grain yield and HI. Results showed that the highest grain yield (1.73 t ha-1) was obtained from the first sowing (30 November) with BINA Sharisha-5 and it was significantly different from the yields of all other combination.J. Bangladesh Agril. Univ. 14(2): 155-160, December 2016

scholarly journals ПРОДУКТИВНІСТЬ СОРТІВ ПШЕНИЦІ ОЗИМОЇ ЗАЛЕЖНО ВІД СТРОКІВ СІВБИ В УМОВАХ ПІВНІЧНОЇ ЧАСТИНИ ЛІВОБЕРЕЖНОГО ЛІСОСТЕПУ УКРАЇНИ

2013 ◽  
pp. 3-9
Author(s):  
А. В. Мельник ◽  
М. Г. Собко ◽  
О. О. Дубовик
Keyword(s):  
Productivity Loss ◽  
Yield Reduction ◽  
Left Bank ◽  
Optimal Conditions ◽  
Sowing Time ◽  
Genetic Potential ◽  
Sowing Dates

За результатами досліджень встановлено, що ви-щі показники продуктивності рослин формуються засівби в період із 10 по 20 вересня. Для більшості сор-тів сівба 20 вересня сприяла найбільшому прояву їхгенетичного потенціалу за показниками продуктив-ності. Встановлена закономірність зниження проду-ктивності в разі відхилення строків сівби від опти-мальних як у бік ранніх (10 вересня), так і пізніх (1 та10 жовтня). Сівба у пізні строки зумовлює різкезниження продуктивності пшениці озимої. Отже,оптимальними строками сівби для умов північноїчастини лівобережного Лісостепу України слід вва-жати 10–20 вересня. Thus, the optimal conditions for the northern part of the Left Bank steppe of Ukraine sowing dates should be considered 10-th – 20-th of September. For most varieties sowing on September the 20-th contributed to greater performance of their genetic potential in terms of productivity. The stated regularity of productivity loss have been stated at a deviation from the optimum sowing time to earlier (September the 10-th) and later (1-st and 10-th of October). Sowing in the later periods in most years leads to greater yield reduction than at early sowing.

scholarly journals Performance of Wheat as Affected by Different Irrigation Levels and Sowing Dates

2017 ◽  
Vol 14 (2) ◽  
pp. 77-85
Author(s):  
Md Sohel Mahmud ◽  
Md Jafar Ullah ◽  
Md Abdullahil Baque ◽  
Lutfun Naher ◽  
Sayed Mohammad Mohsin
Keyword(s):  
Grain Yield ◽  
Maximum Yield ◽  
Growth And Yield ◽  
Sowing Time ◽  
Sowing Dates ◽  
Two Factors ◽  
Main Plot ◽  
Irrigation Levels ◽  
1000 Grain Weight ◽  
Plot Design

The experiment was conducted to determine the effect of irrigations and sowing dates on growth and yield performance of wheat in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period of November 18, 2012 to March 30, 2013. The experiment was comprised of two factors, viz. factor A: two irrigations namely irrigation (I) and no irrigation i.e. control (I0), and factor B: three sowing dates such as S1: 1st sowing on 18 November, S2: 2nd sowing on 03 December and S3: 3rd sowing on 18 December. The experiment was laid out in a split plot design with three replications. Irrigation was assigned in the main plot, while sowing time was in the sub-plots. Data on grain yield and different yield contributing characters were taken after harvest. Results indicated that the highest grain yield was obtained with I (2.915 t ha-1) and S1 (2.983 t ha-1). The interaction of irrigation (I) and sowing on 18 November (S1) showed the maximum yield (3.387t ha-1), spike length (17.08 cm), 1000 grain weight (43.4 g), spikelets spike-1 (20.03) and grain spike-1 (65.58) of wheat.The Agriculturists 2016; 14(2) 77-85

scholarly journals DYNAMICS OF FORMATION OF THE SQUARE OF BEETS PLANTS OF BEETS DEPENDING ON VARIETY SPECIAL FEATURES AND TERMS OF SEEDING UNDER CONDITIONS OF THE RIGHT-FOREST STEPPE OF UKRAINE

2019 ◽  
pp. 173-182
Author(s):  
Inna Palamarchuk
Keyword(s):  
Aerial Part ◽  
Root Formation ◽  
Weather Conditions ◽  
Forest Steppe ◽  
Sowing Time ◽  
The Third ◽  
Sowing Dates ◽  
Number Of Leaves ◽  
The Right ◽  
Sowing Period

The results of studies on the dynamics of the formation of the area of leaves of plants of beetroot canteen depending on varietal characteristics and sowing time in the conditions of the Forest-Steppe of Right-Bank Ukraine are presented. The dependence of the growth and development of beetroot plants on varietal characteristics and sowing dates, as well as on weather conditions that were in the studied time, was revealed. The largest number of leaves in the phase of intensive root formation was formed by plants with a sowing period of I decade of May: 13.3 pcs. / plant – Bordo Kharkivskiy, 13.1 pcs. / plant – Opolskiy. The greatest mass of the root crop in the phase of intensive root formation was planted at a sowing period of the third decade of April: the Bordo Kharkivskiy – 72.4 g, the variety Opolskiy – 43.5 g. The same pattern was observed when taking into account the mass of the aerial part of beetroot. In the Bordo Kharkivskiy variety, it varied from 92.4 g to 87.5 g depending on the sowing time, in the Opolskiy variety from 33.7 g to 31.7 g, that is, the beet plants of the Bordo Kharkivskiy cultivar formed a significantly larger mass of the aerial part in comparison with the Opolskiy variety. Plants were sown with the largest leaf area at a sowing period of the 3rd decade of April: in the Bordo Kharkivskiy – 1.2 – 4.0 thousand m2 / ha, in the Opolskiy variety – 1.0 – 2.3 thousand m2 / ha. According to the results of the crop accounting, it was found that it depended on the variety and sowing period of beetroot. On average, over the years of research, the highest yield was observed with a sowing period of the third decade of April: 63.1 t / ha for the Bordo Kharkivskiy variety, 55.9 t / ha for the Opolskiy variety.

scholarly journals Response of Late Sowing on the Yield and Yield Contributing Character of Different Varieties of Mustard and Rapeseed in Coastal Area of Barguna

1970 ◽  
Vol 42 (4) ◽  
pp. 441-448
Author(s):  
MA Razzaque ◽  
MR Talukder ◽  
Shaleh Uddin ◽  
SI Khan ◽  
Altab Hossain
Keyword(s):  
Coastal Area ◽  
Brassica Species ◽  
Sowing Date ◽  
Rabi Season ◽  
Sowing Time ◽  
Sowing Dates ◽  
Main Plot ◽  
Testing Site ◽  
Late Sowing ◽  
Plot Design

An experiment was carried at Multi Location Testing site Barguna to determine suitable variety of mustard (Brassica species) for the late sowing condition for the coastal area of Bangladesh during rabi season of 1998-1999 and 1999-2000. Four varieties of mustard such as Daulat, Rai-5, Improved tory-7, and Ishurdi local with four sowing dates viz.15 Nov, 23 Nov, 30 Nov. and 7 Dec. were used for the experiment. The experiment was laid out in a split plot design with sowing date in the main plot and varieties in the sub plot. The results revealed that the variety Daulat (1035 kg/ha) and Ishurdi local (1014 kg/ha) produced identically superior yield irrespective of sowing time. 15 November (1164 kg/ha) and 23 November (1002 kg/ha) recorded identically superior yield irrespect of variety. Daulat and Ishurdi local variety sowing could be delayed up to 30 November to obtain a profitable yield of (872 kg/ha) and (940 kg/ha) respectively which was still economically profitable. Key words: Mustard and rapes, Late sowing , variety, Yield, coastal area. Bangladesh J. Sci. Ind. Res. 42(4), 441-448., 2007

scholarly journals Optimum time of sowing for rainfed winter chickpea with one-pass mechanised row-sowing: an example for small-holder farms in north-west Bangladesh

2014 ◽  
Vol 65 (7) ◽  
pp. 602 ◽  
Author(s):  
W. H. Vance ◽  
R. W. Bell ◽  
C. Johansen ◽  
M. E. Haque ◽  
A. M. Musa ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Crop Growth ◽  
Residual Soil ◽  
Reproductive Growth ◽  
Sowing Time ◽  
Minimum Tillage ◽  
North West ◽  
Sowing Dates

The time of sowing chickpea (Cicer arietinum L.) in the High Barind Tract of north-west Bangladesh is critical to crop success. To ensure adequate emergence and subsequent crop growth, chickpea relies on residual soil moisture stored in the profile after rice (Oryza sativa L.) cultivated in the preceding rainy season. With the development of mechanised, one-pass minimum tillage sowing, the time between rice harvest and chickpea sowing is decreased, and temperature constraints that limit biomass and/or pod formation and filling may be avoided. Minimum tillage may also limit evaporation from the soil surface compared with traditional, full cultivation procedures. The objective of this study was to identify the optimum sowing time to achieve adequate crop establishment and limit exposure of the chickpea crop to terminal drought and heat stress later in the growing season. Over three experimental seasons, chickpea sowing dates were spread from 22 November to 22 December. Soil water content, crop growth and temperature were monitored to determine the optimum sowing time. Over all seasons and sowing dates, the volumetric soil water content in the seedbed under minimum tillage remained within 17–34%, a range non-limiting for chickpea establishment in glasshouse and field experiments. Late planting (after 10 December) exposed seedlings to low temperatures (<15°C), which limited biomass formation and extended the vegetative growth phase into periods with high maximum temperatures (>35°C), resulting in unfilled pods and depressed grain yield. The preferred sowing time was determined to be 30 November to 10 December to reduce the risk of high temperatures and low soil water content during chickpea reproductive growth causing terminal heat and drought stress, respectively. Mechanised sowing in one operation allows farmers to optimise their time of sowing to match seed requirements for soil water at emergence and may assist farmers to avoid temperature stresses (both low and high) that constrain chickpea vegetative and reproductive growth.

scholarly journals Study on the Morpho-physiological Character of Four Quality Protein of Maize (Corn)

2017 ◽  
Vol 10 (1) ◽  
pp. 117-124
Author(s):  
SK Mondal ◽  
MM Rahman
Keyword(s):  
Grain Yield ◽  
Sowing Date ◽  
Weight Percent ◽  
Leaf Sheath ◽  
Sowing Time ◽  
Planting Time ◽  
Physiological Character ◽  
Physiological Variability ◽  
Sowing Dates ◽  
Number Of Leaves

The experiment was conducted to find out the morpho-physiological variability in response to different sowing dates in four lines of Quality Protein Maize (QPM) in in the Field Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh. The study was carried out with four lines of maize and two sowing dates, 15 November (T1) and 15 December, ((T2). Sowing date differed significantly in plant height, length of leaf blade, length of leaf sheath, leaf breadth, cob length, cob diameter, length of tassel, days to 50% tasselling, days to 50 % silking, days to maturity, number of cobs per plant, cob weight, number of grain per cob. 1000-seed weight, percent underdeveloped cob, total dry matter and grain yield, but did not differ in number of leaves and protein percent. The lines differed significantly among themselves in those characters except number of leaves per plant, length of leaf sheath, cob length, cob diameter, days to 50% tasselling, number of cobs per plants and number of grain per cob. The line Across 8666 (V2) and (V3) gave the highest grain yield 4.57 and 4.55 and the lowest from (V4) lines 4.41 tons per hectare. The 15 November sowing time (T1) gave the highest grain yield 4.86 tons per hectare. In case of interaction, the earlier planting time (T1) showed better performance with all lines. On the other hand, the highest yield was found from combination of line V2 and V3 with earlier planting time (T1).J. Environ. Sci. & Natural Resources, 10(1): 117-124 2017

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