Abstract
Understanding tillage, N, and P interactions can contribute to improved N and P utilization and crop response. This study examined the interaction effects of tillage and N rate of two N sources on N and P uptake by corn ( Zea mays L.). The study was conducted on Kenyon loam (fine loamy, mixed, mesic Typic Hapludolls) soil at the Iowa State University Northeast Research and Demonstration Farm near Nashua, IA. A randomized complete block design with a split‐plot arrangement in three replications was used for the two separate N source experiments. The tillage systems consist of no‐tillage (NT), strip‐tillage (ST), and chisel plow (CP) as main plots. Within each tillage four N rates (0, 85, 170, and 250 kg N ha −1 ) were assigned as subplots for each N source of manure (total N) and fertilizer (anhydrous ammonia) in a corn‐soybean [ Glycine max (L.) Merr.] rotation. Tillage and increase in N rate beyond 85 kg ha −1 had no effect on corn grain yield with both N sources. Tillage × N rate had a significant effect on plant N and P uptake, especially at early growth stages with both N sources. Recovery percentage of applied N across all tillage systems and N rates was 40% and 27% for manure and fertilizer sources, respectively, at the 12th‐leaf growth stage of corn (V12). Plant N and P uptake at V12 growth stage was 44% and 37%, respectively, across tillage systems, N sources, and N rates. The findings indicate that the N rate and seasonal variability have more influence on plant N and P uptake than does the tillage system.
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Claims 9
Claim · model-written summary
Tillage had no effect on corn grain yield with either nitrogen source.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Tillagee0
- Outcome
- corn grain yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage and increase in N rate beyond 85 kg ha −1 had no effect on corn grain yield with both N sources”
Claim · model-written summary
Increasing nitrogen beyond 85 kg ha −1 did not affect corn grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- increase in N rate beyond 85 kg ha −1e0
- Outcome
- corn grain yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage and increase in N rate beyond 85 kg ha −1 had no effect on corn grain yield with both N sources”
Claim · model-written summary
Tillage by nitrogen rate significantly affected early plant nitrogen uptake.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Tillage × N ratee0
- Outcome
- plant Ne0
- Qualifier
- especially at early growth stages with both N sourcese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage × N rate had a significant effect on plant N and P uptake, especially at early growth stages with both N sources”
t0“Effect of Tillage and Nitrogen Rate on Corn Yield and Nitrogen and Phosphorus Uptake in a Corn‐Soybean Rotation”
Claim · model-written summary
Tillage by nitrogen rate significantly affected early plant phosphorus uptake.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Tillage × N ratee0
- Outcome
- P uptakee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage × N rate had a significant effect on plant N and P uptake, especially at early growth stages with both N sources”
t0“Effect of Tillage and Nitrogen Rate on Corn Yield and Nitrogen and Phosphorus Uptake in a Corn‐Soybean Rotation”
Claim · model-written summary
Applied nitrogen recovery was 40% for manure at corn V12.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- 12th‐leaf growth stagee0
- Treatment
- manuree0
- Outcome
- Recovery percentage of applied Ne0
- Value
- 40%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery percentage of applied N across all tillage systems and N rates was 40% and 27% for manure and fertilizer sources, respectively, at the 12th‐leaf growth stage of corn (V12)”
Claim · model-written summary
Applied nitrogen recovery was 27% for fertilizer at corn V12.
- Taxon
- cornZea mays subsp. mayse0
- Organ / stage
- 12th‐leaf growth stagee0
- Treatment
- fertilizere0
- Outcome
- Recovery percentage of applied Ne0
- Value
- 27%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery percentage of applied N across all tillage systems and N rates was 40% and 27% for manure and fertilizer sources, respectively, at the 12th‐leaf growth stage of corn (V12)”
Claim · model-written summary
Corn nitrogen uptake at V12 was 44% across treatments.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- V12 growth stagee0
- Outcome
- Plant Ne0
- Value
- 44%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant N and P uptake at V12 growth stage was 44% and 37%, respectively, across tillage systems, N sources, and N rates”
t0“Effect of Tillage and Nitrogen Rate on Corn Yield and Nitrogen and Phosphorus Uptake in a Corn‐Soybean Rotation”
Claim · model-written summary
Corn phosphorus uptake at V12 was 37% across treatments.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- V12 growth stagee0
- Outcome
- P uptakee0
- Value
- 37%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant N and P uptake at V12 growth stage was 44% and 37%, respectively, across tillage systems, N sources, and N rates”
t0“Effect of Tillage and Nitrogen Rate on Corn Yield and Nitrogen and Phosphorus Uptake in a Corn‐Soybean Rotation”
Claim · model-written summary
Nitrogen rate and seasonal variability influenced plant nitrogen and phosphorus uptake more than tillage.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- plant N and P uptakee0
- Direction
- more influencee0
- Comparator
- tillage systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the N rate and seasonal variability have more influence on plant N and P uptake than does the tillage system”
t0“Effect of Tillage and Nitrogen Rate on Corn Yield and Nitrogen and Phosphorus Uptake in a Corn‐Soybean Rotation”
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