Abstract
Soybean (Glycine max L. Merill) can produce high-N residues that may benefit subsequent corn (Zea mays L.) production, but the degree of benefit is often unpredictable and may be related to tillage methods. This study investigated the effects of conventional-tillage (CT) and no-tillage (NT) on fertilizer replacement values for corn in a corn-soybean rotation. Field experiments were conducted for two growing seasons on two soils, a Ste. Rosalie clay (Humic Gleysol), and an Ormstown silty clay (Humic Gleysol). Continuous corn, corn following soybean, soybean following corn, continuous soybean, and three levels of fertilizer N (0, 90, 180 and 0, 20, and 40 kg N ha −1 for corn and soybean, respectively) were compared. Tillage did not effect yield or N uptake consistently. Corn grain yields and N uptake were greater following soybean than following corn. Soybean provided N fertilizer credits ranging from 40 to 150 kg N ha −1 , which was greater than the residual NO 3 in the soil prior to planting. Credits were greater in the year with higher corn yields and lower previous winter precipitation resulting in greater NO 3 carryover. Tillage effects on N credits from soybean differed between the sites. Consequently, N contributions of soybean to corn could not be related to tillage method or soil type. Key words:Zea mays L., Glycine max L. Merill, rotations, grain yield, N uptake, tillage, fertilizer N
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Claims 7
Claim · model-written summary
Tillage did not consistently affect yield or nitrogen uptake.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Tillagee0
- Outcome
- yield or N uptakee0
- Direction
- did not effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“corn”
e0“Tillage did not effect yield or N uptake consistently.”
Claim · model-written summary
Corn grain yield was higher following soybean than following corn.
- Taxon
- CornZea mays subsp. mayse1
- Treatment
- following soybeane1
- Outcome
- grain yieldse1
- Direction
- greatere1
- Comparator
- following corne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Corn grain yields and N uptake were greater following soybean than following corn.”
Claim · model-written summary
Corn nitrogen uptake was higher following soybean than following corn.
- Taxon
- CornZea mays subsp. mayse1
- Treatment
- following soybeane1
- Outcome
- N uptakee1
- Direction
- greatere1
- Comparator
- following corne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Corn grain yields and N uptake were greater following soybean than following corn.”
Claim · model-written summary
Soybean provided nitrogen fertilizer credits of 40 to 150 kg N per hectare.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- N fertilizer creditse2
- Direction
- greatere2
- Value
- 40 to 150 kg N ha −1e2
- Comparator
- residual NO 3 in the soil prior to plantinge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Soybean provided N fertilizer credits ranging from 40 to 150 kg N ha −1 , which was greater than the residual NO 3 in the soil prior to planting.”
t0“corn”
Claim · model-written summary
Nitrogen credits were greater with higher corn yields and lower winter precipitation.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Creditse3
- Direction
- greatere3
- Qualifier
- higher corn yields and lower previous winter precipitatione3
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“corn”
e3“Credits were greater in the year with higher corn yields and lower previous winter precipitation resulting in greater NO 3 carryover.”
Claim · model-written summary
Tillage effects on soybean nitrogen credits differed between sites.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Tillage effects on N credits from soybeane4
- Direction
- differede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“corn”
e4“Tillage effects on N credits from soybean differed between the sites.”
Claim · model-written summary
Soybean nitrogen contributions to corn were unrelated to tillage method or soil type.
- Taxon
- cornZea mays subsp. mayse5
- Treatment
- tillage methode5
- Outcome
- N contributions of soybean to corne5
- Direction
- could not be relatede5
- Qualifier
- soil typee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“N contributions of soybean to corn could not be related to tillage method or soil type.”
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