Abstract
Abstract Although the importance of the addition of Zn to a fertilizer program for corn ( Zea mays L.) production has been recognized for some time, the question of effectiveness of source and rate has not been completely resolved. This is especially true for situations where Zn is applied in fluid fertilizers. The objective of this study was to evaluate the effect of five Zn sources [ZnEDTA, Zn‐NH 3 complex, ZnO, ZnSO 4 , and Zn(NO) 3 ) 2 ] applied at five rates (0, 0.11, 0.33, 1.12, and 3.36 kg Zn ha −1 ) on the growth and yield of irrigated corn on sandy soils. The experiments were conducted at four locations during a 2‐yr period. All Zn sources were suspended in ammonium polyphosphate and applied to the side of and below the seed at planting. Whole corn plants were collected at two growth stages and analyzed for Zn. Significant differences among Zn sources for Zn uptake were shown. ZnEDTA performed poorly at two sites due to early season leaching; however, it was the superior source at a calcareous site. The Zn‐NH 3 complex was the superior source at one of the sites. The 0.1 M HCl and DTPA soil tests correlated well with early Zn uptake for the noncalcareous sites. The critical DTPA soil test level for grain response at these locations was near 0.4 mg kg −1 . Grain yields were increased by Zn fertilization at only two locations and there were no differences among Zn sources or significant Zn rate by source interactions. Regression equations for the responsive sites showed that between 1 and 2 kg Zn ha −1 was required to attain maximum yield. Although Zn uptake indicated differences in performance of Zn sources, the differences were not reflected in grain yield.
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Claims 10
Claim · model-written summary
Zn uptake by corn differed significantly among Zn sources.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Zn sourcese1
- Outcome
- Zn uptakee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e1“Significant differences among Zn sources for Zn uptake were shown”
Claim · model-written summary
ZnEDTA performed poorly at two sites because of early season leaching.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- ZnEDTAe3
- Outcome
- performed poorlye3
- Direction
- poorlye3
- Qualifier
- due to early season leachinge3
- Setting
- two sitese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e3“ZnEDTA performed poorly at two sites due to early season leaching; however, it was the superior source at a calcareous site”
Claim · model-written summary
ZnEDTA was the superior Zn source at a calcareous site.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- ZnEDTAe3
- Outcome
- superior sourcee3
- Direction
- superiore3
- Setting
- calcareous sitee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e3“ZnEDTA performed poorly at two sites due to early season leaching; however, it was the superior source at a calcareous site”
Claim · model-written summary
The Zn‐NH 3 complex was the superior Zn source at one of the sites.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Zn‐NH 3 complexe4
- Outcome
- superior sourcee4
- Direction
- superiore4
- Qualifier
- at one of the sitese4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e4“The Zn‐NH 3 complex was the superior source at one of the sites”
Claim · model-written summary
The 0.1 M HCl and DTPA soil tests correlated well with early Zn uptake of corn on noncalcareous sites.
- Taxon
- cornZea mays subsp. mayse0
- Compound
- DTPAe5
- Outcome
- early Zn uptakee5
- Setting
- noncalcareous sitese5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e5“The 0.1 M HCl and DTPA soil tests correlated well with early Zn uptake for the noncalcareous sites”
Claim · model-written summary
The critical DTPA soil test level for corn grain response was near 0.4 mg kg −1.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- critical DTPA soil test level for grain responsee6
- Value
- 0.4 mg kg −1e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e6“The critical DTPA soil test level for grain response at these locations was near 0.4 mg kg −1”
Claim · model-written summary
Zn fertilization increased grain yield at only two locations.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Zn fertilizatione7
- Outcome
- Grain yieldse7
- Direction
- increasede7
- Qualifier
- at only two locationse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e7“Grain yields were increased by Zn fertilization at only two locations”
Claim · model-written summary
Grain yield did not differ among Zn sources or Zn rate‐by‐source interactions.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Zn sourcese2
- Outcome
- Grain yieldse2
- Qualifier
- no differences among Zn sources or significant Zn rate by source interactionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e2“Grain yields were increased by Zn fertilization at only two locations and there were no differences among Zn sources or significant Zn rate by source interactions”
Claim · model-written summary
Between 1 and 2 kg Zn per ha was required to reach maximum corn yield at the responsive sites.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- maximum yielde2
- Value
- between 1 and 2 kg Zn ha −1e2
- Qualifier
- responsive sitese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e2“Regression equations for the responsive sites showed that between 1 and 2 kg Zn ha −1 was required to attain maximum yield”
Claim · model-written summary
Zn uptake differences among Zn sources were not reflected in grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Zn sourcese2
- Outcome
- grain yielde2
- Direction
- not reflectede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the growth and yield of irrigated corn on sandy soils”
e2“Although Zn uptake indicated differences in performance of Zn sources, the differences were not reflected in grain yield”
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See all 3,908 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.