Abstract
Two field experiments were conducted on a typic chromusterts, fine, smectitic, isohyperthermic soil series in the Damazin Research Station Farm during two seasons (2005/06 and 2006/07). The objective was to investigate the effect of phosphorus (P) and nitrogen (N) and their interactions on sunflower (Helianthus annuus L.) growth, seed and oil yield. A randomized complete block design with four replicates was used to execute the experiments. Plant height, dry matter and seed yield were significantly increased by N and P applications in both seasons. The average yield of sunflower seed in the two seasons was 0.486 tonsha -1 for the control and 4.893 tonsha -1 for the highest fertilizer treatment (N 80 P 80 ). Oil seed % gave significant increases in the two seasons due to P, N treatments and their interaction, and the average oil seed was 31.3% for the control compared to 37.5% for the highest treatment (N 80 P 80 ). Phosphorus alone had pronounced effect on oil seed % in the two seasons. There were mutually synergistic effects between N and P which significantly (P<0.01) promoted growth and yield of sunflower. Phosphorus enhanced nitrogen uptake and nitrogen use efficiency and vice versa. At all N applications, phosphorus use efficiency tended to decrease with increase in the rate of P application. The highly significant response of sunflower to P and N fertilizers warrant recommending their application under the rainfed conditions of Damazin, Sudan.
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Claims 9
Claim · model-written summary
N and P applications increased plant height, dry matter and seed yield of sunflower in both seasons.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- N and P applicationse3
- Outcome
- Plant height, dry matter and seed yielde3
- Direction
- increasede3
- Setting
- in both seasonse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e3“Plant height, dry matter and seed yield were significantly increased by N and P applications in both seasons”
Claim · model-written summary
The highest fertilizer treatment (N 80 P 80) gave a higher sunflower seed yield than the control.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- highest fertilizer treatment (N 80 P 80 )e4
- Outcome
- yield of sunflower seede4
- Direction
- higherinferrede4
- Value
- 4.893 tonsha -1e4
- Qualifier
- 0.486 tonsha -1 for the controle4
- Comparator
- controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e4“The average yield of sunflower seed in the two seasons was 0.486 tonsha -1 for the control and 4.893 tonsha -1 for the highest fertilizer treatment (N 80 P 80 )”
Claim · model-written summary
P and N treatments and their interaction significantly increased oil seed percentage of sunflower.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- P, N treatments and their interactione5
- Outcome
- Oil seed %e5
- Direction
- increasese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e5“Oil seed % gave significant increases in the two seasons due to P, N treatments and their interaction, and the average oil seed was 31.3% for the control compared to 37.5% for the highest treatment (N 80 P 80 )”
Claim · model-written summary
Oil seed percentage was 37.5% for the highest treatment (N 80 P 80) against 31.3% for the control.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- highest treatment (N 80 P 80 )e5
- Outcome
- average oil seede5
- Direction
- higherinferrede5
- Value
- 37.5%e5
- Qualifier
- 31.3% for the controle5
- Comparator
- controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e5“Oil seed % gave significant increases in the two seasons due to P, N treatments and their interaction, and the average oil seed was 31.3% for the control compared to 37.5% for the highest treatment (N 80 P 80 )”
Claim · model-written summary
Phosphorus alone had a pronounced effect on oil seed percentage of sunflower.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Phosphorus alonee6
- Outcome
- oil seed %e6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e6“Phosphorus alone had pronounced effect on oil seed % in the two seasons”
Claim · model-written summary
N and P had mutually synergistic effects that significantly promoted growth and yield of sunflower.
- Taxon
- sunflowerHelianthus annuuse7
- Treatment
- N and Pe7
- Outcome
- growth and yielde7
- Direction
- promotede7
- Value
- P<0.01e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e7“There were mutually synergistic effects between N and P which significantly (P<0.01) promoted growth and yield of sunflower”
Claim · model-written summary
Phosphorus enhanced nitrogen uptake and nitrogen use efficiency of sunflower, and vice versa.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Phosphoruse4
- Outcome
- nitrogen uptake and nitrogen use efficiencye4
- Direction
- enhancede4
- Qualifier
- vice versae4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e4“Phosphorus enhanced nitrogen uptake and nitrogen use efficiency and vice versa”
Claim · model-written summary
Phosphorus use efficiency tended to decrease as the rate of P application increased, at all N applications.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- rate of P applicatione5
- Outcome
- phosphorus use efficiencye5
- Direction
- decreasee5
- Qualifier
- tendede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e5“At all N applications, phosphorus use efficiency tended to decrease with increase in the rate of P application”
Claim · model-written summary
Application of P and N fertilizers is recommended for sunflower under the rainfed conditions of Damazin, Sudan.
- Taxon
- sunflowerHelianthus annuuse6
- Treatment
- P and N fertilizerse6
- Outcome
- recommending their applicatione6
- Setting
- rainfed conditions of Damazin, Sudane6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sunflower (Helianthus annuus L.)”
e6“The highly significant response of sunflower to P and N fertilizers warrant recommending their application under the rainfed conditions of Damazin, Sudan”
The same questions in other papers
phosphorus · yield · Helianthus annuus (common sunflower)Results differ
78 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
77 papers more in this group
See all 81 papers →nitrogen · yield · Helianthus annuus (common sunflower)Positive and negative results
181 papers in the same direction as this paper · 10 in the opposite direction · 4 reporting no difference from an alternative
- negative
- no effect
- negative
192 papers more in this group
See all 196 papers →fertilization · yield · Helianthus annuus (common sunflower)Positive and negative results
343 papers in the same direction as this paper · 18 in the opposite direction · 3 reporting no difference from an alternative
- negative
- positive
- positive
361 papers more in this group
See all 365 papers →phosphorus · nutrient: efficiency · Helianthus annuus (common sunflower)Results agree
1 paper in the same direction as this paper
- positive
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.