Abstract
Water‐soluble Zn (WsZn) levels in granular Zn fertilizers are reported to be a reliable estimate of fertilizer Zn availability to crops. Our objectives were to evaluate the immediate and residual effects of four commercial Zn fertilizers with WsZn ranging from 14 to 98% on the growth, Zn nutrition, and yield of field‐grown flood‐irrigated rice ( Oryza sativa L.). Mehlich‐3 extractable Zn response to Zn fertilization was also evaluated. Zinc fertilizers were applied at rates ranging from 2.3 to 18.0 kg Zn ha −1 at two locations in 2000. The immediate and residual effects of Zn fertilizer treatments on rice growth were measured in 2000 and 2001, respectively. Dry matter, tissue Zn concentration, and grain yield were increased from application of 13.5 kg Zn ha −1 for both sites during both years, but the magnitude of response varied between locations. During the first year, at both locations, whole‐seedling Zn concentrations increased linearly as Zn rate increased and was affected by Zn source. Tissue Zn concentration generally declined as the fertilizer WsZn level declined. Zinc rate had the greatest influence on grain yields with near maximum yield produced when >9 kg Zn ha −1 was applied. During the second year, tissue Zn concentration and yield increased linearly or nonlinearly, depending on location, as Zn rate increased and were not affected by Zn source. During the first year, Zn source and rate influenced early season growth and Zn concentrations, but grain yield, Mehlich‐3 soil Zn, and the residual benefits of Zn fertilization were affected only by application rate.
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Claims 8
Claim · model-written summary
Zinc application increased dry matter, tissue zinc and grain yield in both years and sites.
- Taxon
- Rice
Oryza sativat0 - Treatment
- application of 13.5 kg Zn ha −1e0
- Outcome
- Dry matter, tissue Zn concentration, and grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter, tissue Zn concentration, and grain yield were increased from application of 13.5 kg Zn ha −1 for both sites during both years”
t0“Rice”
Claim · model-written summary
The response magnitude varied between locations.
- Taxon
- RiceOryza sativat0
- Outcome
- magnitude of responsee0
- Setting
- locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the magnitude of response varied between locations.”
t0“Rice”
Claim · model-written summary
First-year seedling zinc concentration rose linearly with zinc rate.
- Taxon
- RiceOryza sativat0
- Treatment
- Zn ratee0
- Outcome
- whole‐seedling Zn concentrationse0
- Direction
- increased linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whole‐seedling Zn concentrations increased linearly as Zn rate increased”
t0“Rice”
Claim · model-written summary
First-year seedling zinc concentration varied by zinc source.
- Taxon
- RiceOryza sativat0
- Treatment
- Zn sourcee0
- Outcome
- whole‐seedling Zn concentrationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whole‐seedling Zn concentrations increased linearly as Zn rate increased and was affected by Zn source.”
t0“Rice”
Claim · model-written summary
Tissue zinc concentration declined with lower fertilizer water-soluble zinc.
- Taxon
- RiceOryza sativat0
- Treatment
- fertilizer WsZn levele0
- Outcome
- Tissue Zn concentratione0
- Direction
- declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue Zn concentration generally declined as the fertilizer WsZn level declined.”
t0“Rice”
Claim · model-written summary
Grain yield neared its maximum above 9 kg zinc per hectare.
- Taxon
- RiceOryza sativat0
- Treatment
- >9 kg Zn ha −1e0
- Outcome
- maximum yielde0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“near maximum yield produced when >9 kg Zn ha −1 was applied.”
t0“Rice”
Claim · model-written summary
Second-year tissue zinc and yield increased with zinc rate.
- Taxon
- RiceOryza sativat0
- Treatment
- Zn ratee0
- Outcome
- tissue Zn concentration and yielde0
- Direction
- increasede0
- Qualifier
- depending on locatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tissue Zn concentration and yield increased linearly or nonlinearly, depending on location, as Zn rate increased”
t0“Rice”
Claim · model-written summary
Second-year tissue zinc and yield were unaffected by zinc source.
- Taxon
- RiceOryza sativat0
- Treatment
- Zn sourcee0
- Outcome
- tissue Zn concentration and yielde0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tissue Zn concentration and yield increased linearly or nonlinearly, depending on location, as Zn rate increased and were not affected by Zn source.”
t0“Rice”
The same questions in other papers
zinc atom · yield · Oryza sativa (rice)Results differ
388 papers in the same direction as this paper · 28 in the opposite direction · 2 reporting no difference from an alternative
- positive
- positive
- positive
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See all 419 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.