Abstract
In the eastern Great Plains, winter wheat ( Triticum aestivum L.) is often rotated with other crops to diversify cropping systems. In these multicropping systems, wheat typically is planted with conservation tillage methods, but previous crop residues influence fertilizer N management. This field study was conducted from 1992 through 2001 in southeastern Kansas on a Parsons silt loam soil (fine, mixed, thermic, Mollic Albaqualf). The objectives were to determine effects and interactions of previous crop {grain sorghum [ Sorghum bicolor (L.) Moench] and soybean [ Glycine max (L.) Merr.]}, tillage system [reduced tillage (RT) and no‐tillage (NT)], N rate (67 and 134 kg ha −1 ), and preplant placement (surface‐broadcast and subsurface‐knife) of urea ammonium nitrate solution (UAN, 280 g kg −1 ) on wheat grain yield, yield components, and plant N uptake in a 2‐yr cropping rotation. Wheat yields averaged 3.39 Mg ha −1 following soybean compared with 2.90 Mg ha −1 following grain sorghum. Tillage effects on grain yield were smaller than other treatment factors, averaging 3.23 Mg ha −1 for RT and 3.06 Mg ha −1 for NT. Grain yields were greatest in all cropping systems for the high‐N‐rate subsurface‐knife treatment. Plant N uptake responses indicated that grain yield differences were primarily related to greater immobilization of both fertilizer and soil N following grain sorghum, compared with soybean, and to better utilization of subsurface‐knifed N than surface‐broadcast N. Results indicate that wheat yield potential is more strongly influenced by previous crop, fertilizer N rate, and N placement method than tillage system.
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Claims 7
Claim · model-written summary
Wheat yield was higher following soybean (3.39 Mg/ha) than following grain sorghum (2.90 Mg/ha).
- Taxon
- winter wheat
Triticum aestivume1 - Treatment
- following soybeane2
- Outcome
- Wheat yieldse2
- Direction
- higherinferrede2
- Value
- 3.39 Mg ha −1e2
- Comparator
- following grain sorghume2
- Setting
- southeastern Kansase0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This field study was conducted from 1992 through 2001 in southeastern Kansas on a Parsons silt loam soil”
e1“winter wheat ( Triticum aestivum L.)”
e2“Wheat yields averaged 3.39 Mg ha −1 following soybean compared with 2.90 Mg ha −1 following grain sorghum”
Claim · model-written summary
Tillage effects on grain yield were smaller than the effects of other treatment factors.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- Tillagee3
- Outcome
- grain yielde3
- Direction
- smallere3
- Comparator
- other treatment factorse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e3“Tillage effects on grain yield were smaller than other treatment factors, averaging 3.23 Mg ha −1 for RT and 3.06 Mg ha −1 for NT.”
Claim · model-written summary
Grain yield was higher under reduced tillage (RT, 3.23 Mg/ha) than under no-tillage (NT, 3.06 Mg/ha).
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- RTe3
- Outcome
- grain yielde3
- Direction
- higherinferrede3
- Value
- 3.23 Mg ha −1e3
- Comparator
- NTe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e3“Tillage effects on grain yield were smaller than other treatment factors, averaging 3.23 Mg ha −1 for RT and 3.06 Mg ha −1 for NT.”
Claim · model-written summary
Grain yields were greatest in all cropping systems with the high-N-rate subsurface-knife treatment.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- high‐N‐rate subsurface‐knife treatmente4
- Outcome
- Grain yieldse4
- Direction
- greateste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e4“Grain yields were greatest in all cropping systems for the high‐N‐rate subsurface‐knife treatment.”
Claim · model-written summary
Grain yield differences were primarily related to greater immobilization of fertilizer and soil N following grain sorghum than soybean.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- following grain sorghume5
- Outcome
- grain yield differencese5
- Qualifier
- greater immobilization of both fertilizer and soil Ne5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e5“Plant N uptake responses indicated that grain yield differences were primarily related to greater immobilization of both fertilizer and soil N following grain sorghum, compared with soybean, and to better utilization of subsurface‐knifed N than surface‐broadcast N.”
Claim · model-written summary
Utilization of subsurface-knifed N was better than that of surface-broadcast N.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- subsurface‐knifed Ne5
- Outcome
- utilizatione5
- Direction
- bettere5
- Comparator
- surface‐broadcast Ne5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e5“Plant N uptake responses indicated that grain yield differences were primarily related to greater immobilization of both fertilizer and soil N following grain sorghum, compared with soybean, and to better utilization of subsurface‐knifed N than surface‐broadcast N.”
Claim · model-written summary
Wheat yield potential is more strongly influenced by previous crop, fertilizer N rate and N placement method than by tillage system.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- previous crop, fertilizer N rate, and N placement methode6
- Outcome
- wheat yield potentiale6
- Direction
- more strongly influencede6
- Comparator
- tillage systeme6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“winter wheat ( Triticum aestivum L.)”
e6“Results indicate that wheat yield potential is more strongly influenced by previous crop, fertilizer N rate, and N placement method than tillage system.”
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See all 2,061 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.