Abstract
An experiment was conducted to investigate the effects of different tillage systems (conventional and conservation tillage), seed rate and spraying time on the grain yield and yield components of rapeseed in dryland conditions, this experiment was performed at Agriculture Education Center in Gachsaran during 2007-2008 growing season by RCBD design and strip split plot with 3 replications. Main plots included tillage methods: 1) no-tillage, 2) chisel plow + disk harrow, 3) disk harrow + disk harrow, 4) conventional-till seed drilling, 5) mould board + disk harrow. Sub plots included seed rate with 3 levels, namely 5, 7 and 9 kg/ha, and finally microelements spraying time with 3 levels, namely no spraying, spraying before stem elongation and spraying after flowering. During the growing season yield and yield components of rape seed were recorded. Our results showed that conventional till seed drilling treatment had the highest positive effects on canola yield among treatments. In seed rate treatments, 5 kg/ha exhibited lower yield compared with 7 and 9 kg/ha. There was significant difference between two times spraying (spraying before stem elongation and after flowering) and no spraying on the canola yield. The highest yields were achieved by conventional till seed drilling with 7 kg/ ha seed rate treatment (2957 kg/ha), conventional till seed drilling and spraying before stem elongation treatment (2936 kg/ha) and 7 kg/ha seed rate and spraying before stem elongation (3046 kg/ha), respectively. The least grain yield was recorded in no-tillage treatment with 5 kg/ha seed rate (1317 kg/ha), no-tillage without spraying (1234 kg/ha) and in 5 kg/ha seed rate without spraying (1168 kg/ha), respectively. Generally, planting with conventional-till seed drill device, 7 kg/ha seed rate and spraying before stem elongation were better than the other treatments.
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Claims 11
Claim · model-written summary
Conventional till seed drilling had the highest positive effect on canola yield among tillage treatments.
Verbatim
e0“rapeseed”
e1“conventional till seed drilling treatment had the highest positive effects on canola yield among treatments”
Claim · model-written summary
A 5 kg/ha seed rate yielded less than 7 and 9 kg/ha rates.
Verbatim
e0“rapeseed”
e1“5 kg/ha exhibited lower yield compared with 7 and 9 kg/ha”
Claim · model-written summary
Spraying before stem elongation differed significantly in yield from no spraying.
- Taxon
- rapeseede0
- Treatment
- spraying before stem elongatione1
- Outcome
- canola yielde1
- Comparator
- no sprayinge1
Not reportedDirection
Verbatim
e0“rapeseed”
e1“There was significant difference between two times spraying (spraying before stem elongation and after flowering) and no spraying on the canola yield”
Claim · model-written summary
Spraying after flowering differed significantly in yield from no spraying.
Not reportedDirection
Verbatim
e0“rapeseed”
e1“There was significant difference between two times spraying (spraying before stem elongation and after flowering) and no spraying on the canola yield”
e2“spraying after flowering”
Claim · model-written summary
Conventional till seed drilling with 7 kg/ha seed rate yielded 2957 kg/ha.
Verbatim
e0“rapeseed”
e1“conventional till seed drilling with 7 kg/ ha seed rate treatment (2957 kg/ha)”
e2“The highest yields were achieved by conventional till seed drilling”
Claim · model-written summary
Conventional till seed drilling with spraying before stem elongation yielded 2936 kg/ha.
Verbatim
e0“rapeseed”
e1“conventional till seed drilling and spraying before stem elongation treatment (2936 kg/ha)”
e2“The highest yields were achieved by conventional till seed drilling”
Claim · model-written summary
A 7 kg/ha seed rate with spraying before stem elongation yielded 3046 kg/ha.
Verbatim
e0“rapeseed”
e1“7 kg/ha seed rate and spraying before stem elongation (3046 kg/ha)”
e2“The highest yields were achieved by conventional till seed drilling”
Claim · model-written summary
No tillage with 5 kg/ha seed rate yielded 1317 kg/ha, among the lowest.
Verbatim
e0“rapeseed”
e1“no-tillage treatment with 5 kg/ha seed rate (1317 kg/ha)”
e2“The least grain yield was recorded in no-tillage treatment”
Claim · model-written summary
No tillage without spraying yielded 1234 kg/ha, among the lowest.
Verbatim
e0“rapeseed”
e1“no-tillage without spraying (1234 kg/ha)”
e2“The least grain yield was recorded in no-tillage treatment”
Claim · model-written summary
The 5 kg/ha seed rate without spraying yielded 1168 kg/ha, among the lowest.
Verbatim
e0“rapeseed”
e1“5 kg/ha seed rate without spraying (1168 kg/ha)”
e2“The least grain yield was recorded in no-tillage treatment”
Claim · model-written summary
The authors favored conventional till seed drilling, 7 kg/ha seed rate and spraying before stem elongation.
Verbatim
e0“rapeseed”
e1“planting with conventional-till seed drill device, 7 kg/ha seed rate and spraying before stem elongation were better than the other treatments”
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