Abstract
Abstract Considerable effort has been devoted to the study of the application of N and S for corn ( Zea mays L.) production on irrigated sandy soils in the western Corn Belt. Requirements for P, K, and Zn have not been extensively researched. This study, initiated in 1974 and continued through 1978, was designed to measure the effect of repeated applications of P, K, and Zn to irrigated sandy soil under systems of continuous grain and silage production. Two adjacent series of plots were used. In one series, corn was harvested for grain and the residue was incorporated with a disk. Corn from the adjacent series was harvested for silage each year, thus eliminating the return of any residue to the soil. Twenty‐three treatments were selected from a 5 3 complete factorial to fit a central composite design with identical treatments used in both series. To measure early growth, whole plant samples were collected when plants were 40–60 cm tall. Silage yields were measured prior to or at physiological maturity. Grain yields were measured in mid‐October. Fertilizer P had the most consistent effect on early plant growth, yield, and crop maturity. The application of fertilizer P had a curvilinear effect on early growth and yield with maximum yield produced by the application of 22–33 kg P/ha. The rate of fertilizer P required to achieve maximum production in any one year was not related to yield level. The effect of P on crop maturity was not consistent with the effect being linear in some years and curvilinear in others. The effect of fertilizer K was inconsistent throughout the study. Application of fertilizer Zn had no effect on corn growth, yield, and crop maturity. There was no significant P × Zn interaction throughout the study.
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Claims 7
Claim · model-written summary
P fertilizer had the most consistent effect on early growth, yield and maturity.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- Fertilizer Pe0
- Outcome
- early plant growth, yield, and crop maturitye0
- Qualifier
- most consistent effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer P had the most consistent effect on early plant growth, yield, and crop maturity.”
t0“Corn”
Claim · model-written summary
P fertilizer had a curvilinear effect on early growth and yield, with maximum yield at 22–33 kg P/ha.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- application of 22–33 kg P/hae0
- Outcome
- early growth and yielde0
- Direction
- maximume0
- Qualifier
- curvilinear effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of fertilizer P had a curvilinear effect on early growth and yield with maximum yield produced by the application of 22–33 kg P/ha.”
t0“Corn”
Claim · model-written summary
The P rate needed for maximum annual production was unrelated to yield level.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- rate of fertilizer Pe0
- Outcome
- yield levele0
- Qualifier
- not relatede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of fertilizer P required to achieve maximum production in any one year was not related to yield level.”
t0“Corn”
Claim · model-written summary
P effects on crop maturity were linear in some years and curvilinear in others.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Pe0
- Outcome
- crop maturitye0
- Qualifier
- linear in some years and curvilinear in otherse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of P on crop maturity was not consistent with the effect being linear in some years and curvilinear in others.”
t0“Corn”
Claim · model-written summary
K fertilizer effects were inconsistent throughout the study.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- fertilizer Ke0
- Outcome
- inconsistente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of fertilizer K was inconsistent throughout the study.”
t0“Corn”
Claim · model-written summary
Zn fertilizer had no effect on corn growth, yield or maturity.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Application of fertilizer Zne0
- Outcome
- growth, yield, and crop maturitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of fertilizer Zn had no effect on corn growth, yield, and crop maturity.”
Claim · model-written summary
No significant P × Zn interaction was found.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- P × Zne0
- Outcome
- interactione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant P × Zn interaction throughout the study.”
t0“Corn”
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