Abstract
Productivity of sunflower is strongly regulated by the availability of water. In order to study the influence of deficit irrigation (I1:100% FC, I2 and I3: 75 and 50% FC during stem elongation period, respectively; I4 and I5: 75 and 50% FC at flowering stages) and two row spacings (45 - 50 and 75 cm) on growth, yield and oil yield of sunflower, an experiment was conducted using a split plot design with three replications in the 2007 - 2008. Results indicated that Maximum (374.67 gm-2) and minimum (198.5 gm-2) grain yield was obtained from I1 and I3 treatments. Compared to I1, grain yield was reduced significantly under deficit irrigation treatments (I2, I3 and I5). Interaction effects of row spacing and deficit irrigation indicated that the highest seed yield (458.0 gm-2) and oil percentage (31.66%) was obtained from I1 and 75 cm row spacing. Reduction of grain yield due to deficit irrigation (I4) was not significant (374.6 vs. 340.1 gm-2), compared to full irrigation. Therefore, we confirm that irrigation levels significantly affected seed yield and oil percentage. Our results indicated that deficit irrigation, during the critical growth period should be avoided. Key words: Sunflower, deficit irrigation, seed yield, oil yield, row spacing.
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Claims 8
Claim · model-written summary
Full irrigation I1 produced the maximum grain yield of 374.67 gm-2.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- I1e0
- Outcome
- grain yielde0
- Direction
- Maximume0
- Value
- 374.67 gm-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum (374.67 gm-2) and minimum (198.5 gm-2) grain yield was obtained from I1 and I3 treatments.”
t0“sunflower”
Claim · model-written summary
I3 produced the minimum grain yield of 198.5 gm-2.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- I3e0
- Outcome
- grain yielde0
- Direction
- minimume0
- Value
- 198.5 gm-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum (374.67 gm-2) and minimum (198.5 gm-2) grain yield was obtained from I1 and I3 treatments.”
t0“sunflower”
Claim · model-written summary
I2, I3 and I5 deficit irrigation significantly reduced grain yield relative to I1.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- deficit irrigation treatments (I2, I3 and I5)e0
- Outcome
- grain yielde0
- Direction
- reducede0
- Comparator
- I1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to I1, grain yield was reduced significantly under deficit irrigation treatments (I2, I3 and I5).”
t0“sunflower”
Claim · model-written summary
I1 at 75 cm row spacing gave the highest seed yield, 458.0 gm-2.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- I1 and 75 cm row spacinge0
- Outcome
- seed yielde0
- Direction
- higheste0
- Value
- 458.0 gm-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest seed yield (458.0 gm-2) and oil percentage (31.66%) was obtained from I1 and 75 cm row spacing.”
t0“sunflower”
Claim · model-written summary
I1 at 75 cm row spacing gave the highest oil percentage, 31.66%.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- I1 and 75 cm row spacinge0
- Outcome
- oil percentagee0
- Direction
- higheste0
- Value
- 31.66%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest seed yield (458.0 gm-2) and oil percentage (31.66%) was obtained from I1 and 75 cm row spacing.”
t0“sunflower”
Claim · model-written summary
I4 deficit irrigation reduced grain yield from 374.6 to 340.1 gm-2 versus full irrigation, without statistical significance.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- deficit irrigation (I4)e0
- Outcome
- grain yielde0
- Direction
- Reductione0
- Value
- 340.1 gm-2e0
- Qualifier
- 374.6 vs. 340.1 gm-2e0
- Comparator
- full irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of grain yield due to deficit irrigation (I4) was not significant (374.6 vs. 340.1 gm-2), compared to full irrigation.”
t0“sunflower”
Claim · model-written summary
Irrigation levels significantly affected oil percentage.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- irrigation levelse0
- Outcome
- oil percentagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation levels significantly affected seed yield and oil percentage.”
t0“sunflower”
Claim · model-written summary
The authors advise avoiding deficit irrigation during the critical growth period.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- deficit irrigation, during the critical growth period should be avoidede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deficit irrigation, during the critical growth period should be avoided.”
t0“sunflower”
The same questions in other papers
irrigation · yield · Helianthus annuus (common sunflower)Positive and negative results
41 papers in the same direction as this paper · 123 in the opposite direction
- positive
- positive
- positive
161 papers more in this group
See all 165 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.