Scientific Background - MENDELUweb2.mendelu.cz/af_291_projekty/files/11/11-hall.pdfScientific...
Transcript of Scientific Background - MENDELUweb2.mendelu.cz/af_291_projekty/files/11/11-hall.pdfScientific...
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Scientific BackgroundFacultative FormsPlant requirementsMaterial and MethodsResultsDiscussion
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The sowing date is on of the most important management factors especially under Pannonian climate conditions
In wheat, an increase of 1 °C during the grain filling period can result in a 570-620 kg/ha-1 yield reduction
Drought or heat stress during the grain filling period negatively influence the movement of photosynthetic products to develop kernels and inhibit starch synthesis
The sowing date influences the N accumulation in wheat during the grain filling period. Widdowson detected large differences in N accumulation in wheat due to different environmental conditions during the grain filling period
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Hardly any studies on the suitability of facultative forms in Austria
Facultative forms are suitable for cultivation in areas that do not have heavy frost and do not require cultivars with high levels of hardiness
Adequate alternative to common cultivars?
Flexibility for farmers
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Cultivar XENOS
Sowing depth: 2-4 cm
Time from sowing to grain filling:- autumn sowing: approx. 230 days- spring sowing: approx. 90 days
Optimum temperature for germination: 12-25 °C (min. 2-4 °C)
Optimum sowing date in Austria- autumn sowing: beginning of October to beginning of November - spring sowing: as soon as possible (beginning of March)
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cultivar AGRANO
Sowing depth: 2-4 cm
Time from sowing to grain filling:- autumn sowing: approx. 220 days- spring sowing: approx. 90 days
Optimum temperature for germination: 15-30 °C (min. 2-3°C)
Under stress conditions triticale is very competitive compared to other cereals species
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Experimental farm Groß Enzersdorfin the Marchfeld basin
Semi-arid Pannonian climate- cold winters- fluctuating heavy frost periods- irregular snow crusts- hot summers with intermittently drought
Mean annual temperature: 10.6 °C
Mean precipitation: 538 mm
Above-average long vegetation period (middle of March to middle of November)
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Chernozem with varying levels of loam and loess
High lime contents
At Experimental station: chernozem of alluvial origin - silty-loam which is rich in calcareous sediments- pH 7.6- organic substance: 2.2 – 2.3%
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Split-plot designsowing date was assigned to the main plotcultivar was assigend to the sub plot
4 replications
Sub plot: 10 x 1.5 m
Autumn sowing: October 18th, 2011
Spring sowing: March 13th, 2012
300 germinable seed per m-2
12.5 cm rowing space
Sowing depth 3-4 cm
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Field preparation- field cultivator (15 cm working depth)- short disc harrow (10 cm working depth)
N-fertilization: 100 kg ha-1 Nitramoncal (27 % N) in two equal splits (March 15th, May 5th)
Manual weed control
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Phenological development stages
Development of crop stand height and above-ground biomass
AFTER HARVEST
Stand height
Dry matter production
Ears m-2
Kernels m-2, kernel per ear
TKW
Hectolitre weight
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-15
-10
-5
0
5
10
15
20
25
30
35
Oct-11
Oct-11
Nov-11
Nov-11
Nov-11
Nov-11
Nov-11
Dec-11
Dec-11
Dec-11
Dec-11
Jan-12
Jan-12
Jan-12
Jan-12
Jan-12
Feb-12
Feb-12
Feb-12
Feb-12
Mar-12
Mar-12
Mar-12
Mar-12
Apr-12
Apr-12
Apr-12
Apr-12
May-12
May-12
May-12
May-12
May-12
Jun-12
Jun-12
Jun-12
Jun-12
Jul-12
Jul-12
Source: BOKU, 2012
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0
5
10
15
20
25
Oct-11
Oct-11
Nov-11
Nov-11
Nov-11
Nov-11
Nov-11
Dec-11
Dec-11
Dec-11
Dec-11
Jan-12
Jan-12
Jan-12
Jan-12
Jan-12
Feb-12
Feb-12
Feb-12
Feb-12
Mar-12
Mar-12
Mar-12
Mar-12
Apr-12
Apr-12
Apr-12
Apr-12
May-12
May-12
May-12
May-12
May-12
Jun-12
Jun-12
Jun-12
Jun-12
Jul-12
Jul-12
Source: BOKU, 2012
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2012
3/1 4/1 5/1 6/1 7/1 8/1
BB
CH
0
20
40
60
80
100
2012
3/1 4/1 5/1 6/1 7/1 8/1
0
20
40
60
80
100
Autumn
Spring
Wheat Triticale
On average the spring-sown corps lagged 10 days behind the autumn-sown crops during the whole trial period
During the whole vegetation period the spring-sown crops were not able to make up this developmental edge
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2012
3/1 4/1 5/1 6/1 7/1 8/1
sta
nd
he
igh
t (c
m)
0
20
40
60
80
100
120
2012
3/1 4/1 5/1 6/1 7/1 8/1
0
20
40
60
80
100
120
Autumn
Spring
WHEATAutumn-sown: maximum stand height of 78 cm (May 30th)Spring-sown: maximum stand height of 63 cm (June 11th)
TRITICALEAutumn-sown: maximum stand height of 100 cm (May 30th)Spring-sown: maximum stand height of 89 cm (June 11th)
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2012
3/1 4/1 5/1 6/1 7/1 8/1
AG
DM
(g
m-2)
0
200
400
600
800
1000
1200
2012
3/1 4/1 5/1 6/1 7/1 8/1
0
200
400
600
800
1000
1200
Autumn
Spring
Wheat Triticale
Autumn-sown wheat and triticale produced much higher above-ground dry matter than spring-sown variants (wheat: 997 vs. 662 g m-2; triticale: 972 vs. 748 g m-2)
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2012
3/1 4/1 5/1 6/1 7/1 8/1
CG
R (
g-1 m
-2 d
--1)
0
5
10
15
20
25
2012
3/1 4/1 5/1 6/1 7/1 8/1
0
5
10
15
20
Autumn
Spring Wheat Triticale
WHEATAutumn: substantial peak between BBCH macro stage 3 and 5 followed by a sharp decline Spring: fluctuating line with slight peaks at BBCH macro stage 3 and 6
TRITICALEAutumn-sowing: high increase between BBCH macro stage 2 and BBCH macro stage 5 Spring-sowing: strong increase of growth until BBCH macro stage 5
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2012
3/1 4/1 5/1 6/1 7/1 8/1
RG
R (
g-1 g
-1 d
--1)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
2012
3/1 4/1 5/1 6/1 7/1 8/1
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
Autumn
Spring
Wheat Triticale
The relative crop growth rate of the spring-sown crops was substantially higher than those of the autumn-sown wheat and triticale
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The yield parameters of the autumn-sown wheat and triticale are both, significantly higher than the yield parameters of the spring-sown wheat and triticale
parameter unit wheat triticale
autumn spring autumn spring
grain g m-2 356a 204b 327a 220b
harvest index % 0,43a 0,37b 0,40a 0,35b
ear density m-2 380a 313b 295a 320b
hectolitre weight kg 81 76,64b 75,8a 68,98b
grains ear-1 24a 19b 28a 20b
grains m-2 8.950a 5877b 8.235a 6534b
TKW g 43,00a 35,74b 41,13a 35,05b
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Autumn-sowing resulted in a faster development and faster ripening than spring sowing
Spring-sown crops lagged approx. 10 days behind the autumn sown crops during the whole trial period
Spring-sown crops showed substantial lower stand heights and above-ground dry matter leading to significantly lower yields and yield parameters
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Crops with longer development cycles could be able to produce higher dry matter and higher yield
>> more time to utilize available growth resources (light, nutrients, moisture etc.) which are used to produce and partition more assimilates to the sinks
Spike weight at anthesis is well correlated with kernel number, which is a prime determinant of grain yield
>> the longer the spike growth duration, the higher is the supply of
photoassimilates to the spike Especially under dry conditions the yield of triticale greatly depends on translocation of per-anthesis assimilates to the grain
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High temperature after anthesis can dramatically reduce grain yield
>> as temperatures rises, photosynthesis reaches a maximum at
about 20 °C while respiration continues to increase. This reduces the available assimilates for growth
Significant differences of environmental condition during grain filling
>> by changing the duration of the pre-anthesis period and the environmental conditions during the grain filling period, the sowing date significantly modifies the contribution of the post-anthesis dry matter to grain dry matter
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