Abstract
Abstract In a greenhouse study, a significant increase in sunflower (Helianthus annuus L., cv. Hysun 33) dry matter yield was observed with boron (B) application to a B-deficient (hot water-extractable, 0.23 mg B kg−1) calcareous soil of Missa series (Typic Ustochrept). Six rates of B, ranging from 0 to 8 mg B kg−1 soil, were applied as H3BO3 along with adequate basal fertilization of nitrogen (N), phosphorus (P), potassium (K), and zinc (Zn). Four plants of sunflower were grown in each pot; two were harvested after 4 weeks of germination and the other two after 8 weeks. Maximum crop biomass was produced with 1.0 mg B kg −1, and application of ≥2.0 mg B kg−1 proved toxic, resulting in drastic yield suppressions. Critical B concentration range for deficiency diagnosis in 4‐week‐old sunflower whole shoots appears to be 46–63 mg B kg−1. However, critical concentration in 8‐week‐old plants was much less (i.e., 36 mg B kg−l), presumably due to a dilution effect. As plant's internal B requirement can vary, in fact manifold, depending on the species, plant part, and plant age, only a relevant criterion can help in diagnosing the deficiency effectively.
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Claims 6
Claim · model-written summary
Boron application significantly increased sunflower dry matter yield in deficient soil.
- Taxon
- sunflower
Helianthus annuuse0 - Material
- cv. Hysun 33e0
- Treatment
- boron (B) applicatione0
- Outcome
- dry matter yielde0
- Direction
- increasee0
- Setting
- Missa seriese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase in sunflower (Helianthus annuus L., cv. Hysun 33) dry matter yield was observed with boron (B) application to a B-deficient (hot water-extractable, 0.23 mg B kg−1) calcareous soil of Missa series (Typic Ustochrept)”
Claim · model-written summary
Maximum sunflower biomass occurred with 1.0 mg B kg −1.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- 1.0 mg B kg −1e0
- Outcome
- crop biomasse0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum crop biomass was produced with 1.0 mg B kg −1”
t0“Sunflower”
Claim · model-written summary
Boron at or above 2.0 mg B kg−1 was toxic and sharply suppressed yield.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- ≥2.0 mg B kg−1e0
- Outcome
- yielde0
- Direction
- suppressionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of ≥2.0 mg B kg−1 proved toxic, resulting in drastic yield suppressions”
t0“Sunflower”
Claim · model-written summary
The critical boron concentration for four week old shoots was 46–63 mg B kg−1.
- Taxon
- sunflowerHelianthus annuuse0
- Organ / stage
- 4‐week‐old sunflower whole shootse0
- Outcome
- Critical B concentration rangee0
- Value
- 46–63 mg B kg−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical B concentration range for deficiency diagnosis in 4‐week‐old sunflower whole shoots appears to be 46–63 mg B kg−1”
Claim · model-written summary
The critical concentration in eight week old plants was 36 mg B kg−l.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- 8‐week‐old plantse0
- Outcome
- critical concentratione0
- Direction
- much lesse0
- Value
- 36 mg B kg−le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“critical concentration in 8‐week‐old plants was much less (i.e., 36 mg B kg−l)”
t0“Sunflower”
Claim · model-written summary
Authors recommend an age and tissue relevant diagnostic criterion because internal boron requirements vary.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- relevant criterione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only a relevant criterion can help in diagnosing the deficiency effectively”
t0“Sunflower”
The same questions in other papers
boron atom · yield · Helianthus annuus (common sunflower)Results differ
57 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
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See all 64 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.