Abstract
Among the cultures used for the production of biofuels, the sunflower is one of the most important. Although some information exists, the water and nutritional needs of sunflower in the north east of Brazil are not well known. To fill knowledge gaps, an experiment was carried out to evaluate the effect of nitrogen (N), phosphorus (P), potassium (K) fertilization and available soil water (ASW) on sunflower yields. The sunflower cultivar Embrapa 122-V2000 was subjected to 44 treatments on a completely randomized design generated by the Baconian Matrix with four rates of N (0, 60, 80 and 100 kg·ha-1), four rates of P2O5 (0, 80, 100 and 120 kg·ha-1), four rates of K2O (0, 80, 100 and 120 kg·ha-1), and four available soil water (ASW) levels (55%, 70%, 85% and 100%) replicated three times. Urea was used as a source of N, triple super phosphate as P and potassium chloride as K. In all the experimental units was applied 2 kg·B·ha-1 as boric acid. The components of production evaluated were dry matter of the head, total number of achenes, total achenes’ weight and 1000 achenes’ weight. The results of this research showed that nitrogen had a significant effect on the dry matter of the head, total number of achenes and total achenes’ weight. Phosphorus affected all production components and potassium affected the total number and the weight of achenes. With the exception of the 1000 achenes’ weight, all the production components of the sunflower increased with the increased ASW level influenced significantly at 0.01 level of probably the total number of achenes. The highest rates of N, P and K (100, 120 and 120 kg·ha-1, respectively) and 100% of available soil water produced the highest production.
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Claims 6
Claim · model-written summary
Nitrogen significantly affected head dry matter, achene number and total achene weight.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- nitrogene0
- Outcome
- dry matter of the head, total number of achenes and total achenes’ weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen had a significant effect on the dry matter of the head, total number of achenes and total achenes’ weight”
t0“Sunflower”
Claim · model-written summary
Phosphorus affected all measured production components.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Phosphoruse0
- Outcome
- all production componentse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus affected all production components”
t0“Sunflower”
Claim · model-written summary
Potassium affected achene number and weight.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- potassiume0
- Outcome
- total number and the weight of achenese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potassium affected the total number and the weight of achenes”
t0“Sunflower”
Claim · model-written summary
Increasing available soil water increased all production components except thousand-achene weight.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- increased ASW levele0
- Outcome
- all the production componentse0
- Direction
- increasede0
- Qualifier
- With the exception of the 1000 achenes’ weighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the exception of the 1000 achenes’ weight, all the production components of the sunflower increased with the increased ASW level”
t0“Sunflower”
Claim · model-written summary
Available soil water significantly affected achene number.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- increased ASW levele1
- Outcome
- total number of achenese0
- Qualifier
- 0.01 levele0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“influenced significantly at 0.01 level of probably the total number of achenes”
e1“increased ASW level”
t0“Sunflower”
Claim · model-written summary
The highest N, P and K rates with full available soil water produced the highest production.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- The highest rates of N, P and K (100, 120 and 120 kg·ha-1, respectively) and 100% of available soil watere0
- Outcome
- productione0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest rates of N, P and K (100, 120 and 120 kg·ha-1, respectively) and 100% of available soil water produced the highest production”
t0“Sunflower”
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phosphorus · yield · Helianthus annuus (common sunflower)Results differ
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See all 196 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.