Abstract
A series of experiments was carried out in 2012–2014 in Pailin province, Cambodia, to determine the potential and agronomic requirements for a dry season sunflower crop. The research showed that the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield but two varieties had <50% emergence and poor hybrid seed quality was seen as a constraint to planting under rainfed conditions. Sunflower receiving a basal application of 20:20:15 (N:P2O5:K2O) at 200 kg ha−1 produced achene yield of 2423 kg−1, while side-dressing with urea had no effect on yield. Application of s-metolachlor post-sowing pre-emergence was the most effective weed control treatment and significantly increased sunflower achene yield. Post-emergence weed control was not adequate to prevent yield loss from weed competition. The study showed that sunflower can be grown successfully as a dry season crop in North-West Cambodia when planted no-tillage on residual soil water remaining after maize harvest in October and November. The critical requirements for success are related to preservation and effective use of residual soil water and include minimal soil disturbance, adequate application of fertiliser at sowing, and pre-emergence control of weeds, especially grasses.
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Claims 9
Claim · model-written summary
The six high-oleic sunflower hybrids evaluated were similar in phenological development and yield.
- Taxon
- sunflower
Helianthus annuuse0 - Material
- high-oleic sunflower hybridse0
- Outcome
- phenological development and yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield”
Claim · model-written summary
Two sunflower varieties had less than 50% emergence.
- Taxon
- sunflowerHelianthus annuuse0
- Material
- two varietiese1
- Outcome
- emergencee1
- Value
- <50%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield”
e1“two varieties had <50% emergence”
Claim · model-written summary
Poor hybrid seed quality was a constraint to sunflower planting under rainfed conditions.
- Taxon
- sunflowerHelianthus annuuse0
- Outcome
- hybrid seed qualitye2
- Qualifier
- a constraint to plantinge2
- Setting
- rainfed conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield”
e2“poor hybrid seed quality was seen as a constraint to planting under rainfed conditions”
Claim · model-written summary
Basal application of 20:20:15 (N:P2O5:K2O) at 200 kg ha−1 produced sunflower achene yield of 2423 kg−1.
- Taxon
- SunflowerHelianthus annuuse0
- Treatment
- basal application of 20:20:15 (N:P2O5:K2O) at 200 kg ha−1e0
- Outcome
- achene yielde0
- Value
- 2423 kg−1e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sunflower receiving a basal application of 20:20:15 (N:P2O5:K2O) at 200 kg ha−1 produced achene yield of 2423 kg−1”
Claim · model-written summary
Side-dressing with urea had no effect on sunflower yield.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- side-dressing with ureae4
- Outcome
- yielde4
- Direction
- no effecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield”
e4“side-dressing with urea had no effect on yield”
Claim · model-written summary
S-metolachlor applied post-sowing pre-emergence was the most effective weed control and significantly increased sunflower achene yield.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- s-metolachlor post-sowing pre-emergencee5
- Outcome
- achene yielde5
- Direction
- increasede5
- Qualifier
- most effective weed control treatmente5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield”
e5“Application of s-metolachlor post-sowing pre-emergence was the most effective weed control treatment and significantly increased sunflower achene yield”
Claim · model-written summary
Post-emergence weed control did not prevent sunflower yield loss from weed competition.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- Post-emergence weed controle6
- Interactor
- weede6weed
- Outcome
- yield loss from weed competitione6
- Direction
- not adequate to prevente6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the six high-oleic sunflower hybrids evaluated were similar for phenological development and yield”
e6“Post-emergence weed control was not adequate to prevent yield loss from weed competition”
Claim · model-written summary
Sunflower can be grown successfully as a dry-season crop in North-West Cambodia when planted no-tillage on residual soil water after maize.
- Taxon
- sunflowerHelianthus annuuse7
- Outcome
- grown successfully as a dry season crope7
- Setting
- North-West Cambodiae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“sunflower can be grown successfully as a dry season crop in North-West Cambodia when planted no-tillage on residual soil water remaining after maize harvest”
Claim · model-written summary
Critical requirements for dry-season sunflower success are minimal soil disturbance, adequate fertiliser at sowing, and pre-emergence weed control.
- Taxon
- sunflowerHelianthus annuuse6
- Outcome
- critical requirements for successe7
- Qualifier
- minimal soil disturbance, adequate application of fertiliser at sowing, and pre-emergence control of weedse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“sunflower can be grown successfully as a dry season crop in North-West Cambodia when planted no-tillage on residual soil water remaining after maize harvest”
e7“The critical requirements for success are related to preservation and effective use of residual soil water and include minimal soil disturbance, adequate application of fertiliser at sowing, and pre-emergence control of weeds, especially grasses”
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