Abstract
Abstract It has been shown that there are significant differences in the potential rate of mineralization and nitrification between conventional and no‐till soils. However, the practical effect of this difference on the availability of residual N from a legume and yield of a succeeding corn crop is unclear. Two field experiments in which corn ( Zea mays L.) followed alfalfa ( Medicago sativa L.) were conducted on a Hagerstown silt loam (fine, mixed, mesic Typic Hapludult) and on a Gilpin channery silt loam (fine‐loamy, mixed, mesic Typic Hapludult) to determine the effect of no‐tillage (NT) and conventional tillage (CT) methods on residual N availability from the legume as measured by yield and N uptake of the succeeding corn crop. Five rates of N (0, 45, 90, 135, and 180 kg ha −1 ) as ammonium nitrate were surface applied as either at‐planting or sidedress applications. The mean soil N‐supplying capability was 126 kg N ha −1 at both sites. There was no interaction between tillage method and N response, indicating that the fertilizer N recommendations for first‐year corn following alfalfa should be similar for NT and CT methods. Optimum economic grain yields for first‐year corn resulted with the application of 83 and 88 kg N ha −1 for the NT and CT treatments, respectively, at one site and with no added N at a second site, confirming this conclusion. The experiment was repeated for the second year at one site and the results for the second year also indicated that there was no difference in N fertilizer response due to tillage and no interaction between tillage and N response. Again this would indicate that N recommendations should be similar for the two tillage systems. There was no yield response to time of N application.
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Claims 8
Claim · model-written summary
Mean soil nitrogen supply was 126 kg N ha −1 at both corn sites.
- Taxon
- corn
Zea mays subsp. mayse1 - Outcome
- soil N‐supplying capabilitye0
- Value
- 126 kg N ha −1e0
- Setting
- both sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean soil N‐supplying capability was 126 kg N ha −1 at both sites”
e1“corn ( Zea mays L.) followed alfalfa”
Claim · model-written summary
Tillage method did not interact with nitrogen response in first-year corn.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- tillage methode0
- Outcome
- N responsee0
- Direction
- no interactione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no interaction between tillage method and N response”
e1“corn ( Zea mays L.) followed alfalfa”
Claim · model-written summary
First-year corn economic grain yield was optimized at 83 kg N ha −1 under no tillage at one site.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- NTe0
- Outcome
- economic grain yieldse0
- Direction
- Optimume0
- Value
- 83e0
- Qualifier
- kg N ha −1e0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum economic grain yields for first‐year corn resulted with the application of 83 and 88 kg N ha −1 for the NT and CT treatments, respectively, at one site”
e1“no‐tillage (NT) and conventional tillage (CT)”
Claim · model-written summary
First-year corn economic grain yield was optimized at 88 kg N ha −1 under conventional tillage at one site.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- CTe0
- Outcome
- economic grain yieldse0
- Direction
- Optimume0
- Value
- 88e0
- Qualifier
- kg N ha −1e0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum economic grain yields for first‐year corn resulted with the application of 83 and 88 kg N ha −1 for the NT and CT treatments, respectively, at one site”
Claim · model-written summary
At a second site, first-year corn economic grain yield was optimal without added nitrogen.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- no added Ne0
- Outcome
- economic grain yieldse1
- Direction
- Optimume1
- Setting
- a second sitee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with no added N at a second site”
e1“Optimum economic grain yields for first‐year corn”
Claim · model-written summary
Second-year corn nitrogen fertilizer response did not differ by tillage.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- tillagee0
- Outcome
- N fertilizer responsee0
- Direction
- no differencee0
- Qualifier
- second yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the results for the second year also indicated that there was no difference in N fertilizer response due to tillage and no interaction between tillage and N response”
e1“corn ( Zea mays L.) followed alfalfa”
Claim · model-written summary
Corn yield did not respond to nitrogen application timing.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- time of N applicatione0
- Outcome
- yield responsee0
- Direction
- no yield responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no yield response to time of N application”
e1“corn ( Zea mays L.) followed alfalfa”
Claim · model-written summary
Nitrogen recommendations for corn after alfalfa should be similar under both tillage systems.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- N recommendations should be similar for the two tillage systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N recommendations should be similar for the two tillage systems”
e1“corn ( Zea mays L.) followed alfalfa”
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1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative
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See all 2,185 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.