Abstract
Success of conservation tillage systems requires good fertilizer management, especially nitrogen applied to crops grown on claypan soils in the eastern Great Plains. Recently introduced, short‐season corn ( Zea mays L.) hybrids, that mature earlier and potentially avoid drought problems common on these soils in late summer, provide producers with another viable cropping option. However, information on N management in conservation tillage systems is lacking for short‐season corn grown on claypan soils. The objective of this study was to examine the effect of fertilizer N at rates of 0, 30, 60, 90, and 120 lb/acre applied by surface broadcast, surface band (dribble), and subsurface band (knife) placement methods on short‐season corn grown in no‐tillage and ridge‐tillage systems. Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate. However, this trend was not apparent in 1996 and 1998, when yields were lower because of less rainfall. In 1996 and 1998, yield was not increased at N rates greater than 60 lb/acre, but in 1997, maximum yield was obtained at the 120 lb/acre N rate. Nitrogen placement effects on yield were inconsistent. Yield improvements resulting from increased N rate can be attributed to improved yield components, especially the number of kernels per ear, which was doubled with N at 120 lb/acre compared to no fertilizer N. Increasing N rate resulted in small increases in crude protein concentration in the corn grain. Even though more samples were contaminated with aflatoxin and at higher levels in the drier years, tillage and N management had little effect on aflatoxin concentrations. Corn grown on a claypan soil can respond to increased N rate and conservation tillage systems, especially in higher rainfall years, but the effect due to N placement is inconsistent.
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Claims 8
Claim · model-written summary
Corn yield in 1997 was about 25 bu/acre higher with ridge tillage than with no tillage when fertilizer N was applied.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- ridge tillagee0
- Outcome
- corn yielde0
- Direction
- moree0
- Value
- 25 bu/acree0
- Qualifier
- when fertilizer N was applied at any ratee0
- Comparator
- no tillagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
Claim · model-written summary
In 1996 and 1998, corn yield was not increased at N rates greater than 60 lb/acre.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- N rates greater than 60 lb/acree0
- Outcome
- yielde0
- Direction
- not increasede0
- Qualifier
- In 1996 and 1998e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1996 and 1998, yield was not increased at N rates greater than 60 lb/acre”
e1“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
Claim · model-written summary
In 1997, maximum corn yield was obtained at the 120 lb/acre N rate.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- 120 lb/acre N ratee0
- Outcome
- maximum yielde0
- Direction
- maximume0
- Qualifier
- in 1997e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but in 1997, maximum yield was obtained at the 120 lb/acre N rate”
e1“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
Claim · model-written summary
Nitrogen placement effects on corn yield were inconsistent.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Nitrogen placemente0
- Outcome
- yielde0
- Qualifier
- inconsistente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen placement effects on yield were inconsistent”
e1“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
Claim · model-written summary
Doubling of the number of kernels per ear at 120 lb/acre N, compared with no fertilizer N, accounts for much of the yield gain.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- N at 120 lb/acree0
- Outcome
- number of kernels per eare0
- Direction
- doublede0
- Comparator
- no fertilizer Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield improvements resulting from increased N rate can be attributed to improved yield components, especially the number of kernels per ear, which was doubled with N at 120 lb/acre compared to no fertilizer N”
e1“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
Claim · model-written summary
Increasing N rate resulted in small increases in crude protein concentration in corn grain.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Increasing N ratee0
- Outcome
- crude protein concentratione0
- Direction
- small increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rate resulted in small increases in crude protein concentration in the corn grain”
Claim · model-written summary
Tillage and N management had little effect on aflatoxin concentrations in corn.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- tillage and N managemente0
- Outcome
- aflatoxin concentrationse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tillage and N management had little effect on aflatoxin concentrations”
e1“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
Claim · model-written summary
More corn samples were contaminated with aflatoxin, and at higher levels, in drier years.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- aflatoxine0
- Direction
- higher levelse0
- Setting
- drier yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more samples were contaminated with aflatoxin and at higher levels in the drier years”
e1“Average corn yield in 1997 was about 25 bu/acre more with ridge tillage than with no tillage when fertilizer N was applied at any rate”
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