Abstract
Although fertilizer N response of first‐year corn ( Zea mays L.) following alfalfa ( Medicago sativa L.) has been reported for more than 350 site‐years of research, N responses under no‐tillage have been reported for only 17 site‐years. To determine the rate of N fertilizer required for first‐year corn after alfalfa in no‐tillage systems, on‐farm experiments were conducted at seven locations in southern Minnesota and southwestern Wisconsin. The accuracy of the presidedress soil nitrate test (PSNT) and basal stalk nitrate test (BSNT) to identify the need for supplemental N in first‐year, no‐tillage corn also was evaluated. Across seven site‐years, no yield response to fertilizer N was observed for corn grain, cob, stover, or silage yield, confirming that alfalfa N credits can supply the entire N requirement of no‐tillage corn following alfalfa. Critical levels of PSNT used in other U.S. Corn Belt states, incorrectly predicted responses to supplemental N at all six locations where PSNT was measured (soil NO 3 –N concentrations were ≤18 mg kg −1 ), suggesting that critical levels may need to be reduced in no‐tillage corn following alfalfa. In this first report under no‐tillage conditions, the BSNT concentrations in nonfertilized corn after alfalfa were in the marginal range at two locations (between 250 and 700 mg NO 3 –N kg −1 ) and optimum or above at the other five locations, indicating that the BSNT incorrectly characterized N supply in two of seven cases.
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Claims 6
Claim · model-written summary
Fertilizer nitrogen produced no yield response in corn grain, cob, and stover across seven site-years.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- fertilizer Ne0
- Outcome
- corn grain, cob, stovere0
- Direction
- no yield responsee0
- Value
- seven site‐yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across seven site‐years, no yield response to fertilizer N was observed for corn grain, cob, stover, or silage yield”
Claim · model-written summary
Fertilizer nitrogen produced no corn silage yield response across seven site-years.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- fertilizer Ne0
- Outcome
- silage yielde0
- Direction
- no yield responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across seven site‐years, no yield response to fertilizer N was observed for corn grain, cob, stover, or silage yield”
Claim · model-written summary
PSNT critical levels incorrectly predicted supplemental nitrogen responses at all six measured locations.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- incorrectly predicted responses to supplemental Ne0
- Value
- all six locationse0
- Setting
- U.S. Corn Belt statese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Critical levels of PSNT used in other U.S. Corn Belt states, incorrectly predicted responses to supplemental N at all six locations where PSNT was measured (soil NO 3 –N concentrations were ≤18 mg kg −1 )”
t0“Corn after Alfalfa”
Claim · model-written summary
Nonfertilized corn basal stalk nitrate was marginal at two locations.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- BSNT concentrationse0
- Value
- between 250 and 700 mg NO 3 –N kg −1e0
- Qualifier
- two locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BSNT concentrations in nonfertilized corn after alfalfa were in the marginal range at two locations (between 250 and 700 mg NO 3 –N kg −1 )”
Claim · model-written summary
Nonfertilized corn basal stalk nitrate was optimum or above at five locations.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- optimum or abovee0
- Qualifier
- other five locationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimum or above at the other five locations”
t0“Corn after Alfalfa”
Claim · model-written summary
The basal stalk nitrate test incorrectly characterized nitrogen supply in two of seven cases.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- incorrectly characterized N supplye0
- Value
- two of seven casese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the BSNT incorrectly characterized N supply in two of seven cases”
t0“Corn after Alfalfa”
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