Abstract
Abstract Methods of fallowing commonly used in the Southern Great Plains are relatively ineffective for increasing soil water contents, and subsequent crop yields on a total area basis are less with fallow than with continuous cropping. Consequently, improved cropping practices are needed that increase soil water storage during fallow or that decrease the total time devoted to fallow in a cropping sequence. The objective of this study was to determine the effects of disk, sweep, limited‐, and no‐tillage on soil water storage and yields of dryland sunflower ( Helianthus annuus L.) and irrigated wheat ( Triticum aestivum L.) when grown in rotation. The tillage treatments were applied during the 10‐month fallow period between harvest of irrigated wheat and planting of dryland sunflower. Wheat was planted immediately after sunflower harvest. Average gains in soil water content during fallow ranged from 3.8 cm with disk tillage to 7.2 cm with no‐tillage. These differences were statistically significant, but subsequent sunflower seed yields, which averaged 1.26, 1.24, 1.24, and 1.38 metric tons/ha with disk, sweep, limited‐, and no‐tillage treatments, respectively, were not significantly different. Grain yield of wheat planted after sunflower averaged 4.17 metric tons/ha. There were no significant residual effects of the tillage treatments on wheat yields. For 1977 and 1978, wheat yields in this study (excluding limited‐tillage) averaged 3.40 metric tons/ha compared with 2.22 metric tons/ha in an irrigated wheat‐fallow‐dryland grain sorghum [ Sorghum bicolor (L.) Moench] study with the same tillage treatments. The wheat‐sunflower rotation resulted in more timely planting and higher yields of wheat than the wheat‐sorghum rotation. The wheat‐sunflower rotation allows timely planting of wheat and sunflower, provides for two crops in 2 years, and thus should increase total yields as compared with systems involving an extra fallow period.
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Claims 8
Claim · model-written summary
No-tillage gained 7.2 cm soil water during fallow versus 3.8 cm under disk tillage, a significant difference.
- Treatment
- no‐tillagee0
- Outcome
- soil water contente0
- Direction
- gainse0
- Value
- 7.2 cme0
- Qualifier
- 3.8 cme0
- Comparator
- disk tillagee0
Not reportedTaxon
Verbatim
e0“Average gains in soil water content during fallow ranged from 3.8 cm with disk tillage to 7.2 cm with no‐tillage. These differences were statistically significant”
t0“Sunflower”
Claim · model-written summary
Sunflower seed yields under disk, sweep, limited and no tillage were not significantly different.
- Taxon
- Sunflower
Helianthus annuust0 - Treatment
- disk, sweep, limited‐, and no‐tillage treatmentse0
- Outcome
- sunflower seed yieldse0
- Direction
- not significantly differente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunflower seed yields, which averaged 1.26, 1.24, 1.24, and 1.38 metric tons/ha with disk, sweep, limited‐, and no‐tillage treatments, respectively, were not significantly different”
t0“Sunflower”
Claim · model-written summary
Wheat yield after sunflower averaged 4.17 metric tons/ha.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- Grain yielde0
- Value
- 4.17 metric tons/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield of wheat planted after sunflower averaged 4.17 metric tons/ha”
Claim · model-written summary
Tillage had no significant residual effect on wheat yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- tillage treatmentse0
- Outcome
- wheat yieldse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no significant residual effects of the tillage treatments on wheat yields.”
Claim · model-written summary
Wheat yield in the wheat–sunflower rotation exceeded that in a wheat–sorghum study, 3.40 versus 2.22 metric tons/ha.
- Taxon
- wheatTriticum aestivume0
- Treatment
- this studye0
- Outcome
- wheat yieldse0
- Direction
- highere1
- Value
- 3.40 metric tons/hae0
- Qualifier
- 2.22 metric tons/hae0
- Comparator
- irrigated wheat‐fallow‐dryland grain sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat yields in this study (excluding limited‐tillage) averaged 3.40 metric tons/ha compared with 2.22 metric tons/ha in an irrigated wheat‐fallow‐dryland grain sorghum [ Sorghum bicolor (L.) Moench] study with the same tillage treatments”
e1“higher yields of wheat”
Claim · model-written summary
Wheat–sunflower rotation permitted more timely wheat planting than wheat–sorghum rotation.
- Taxon
- wheatTriticum aestivume0
- Treatment
- wheat‐sunflower rotatione0
- Outcome
- timely plantinge0
- Direction
- more timelye0
- Comparator
- wheat‐sorghum rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wheat‐sunflower rotation resulted in more timely planting and higher yields of wheat than the wheat‐sorghum rotation.”
Claim · model-written summary
Wheat–sunflower rotation yielded more wheat than wheat–sorghum rotation.
- Taxon
- wheatTriticum aestivume0
- Treatment
- wheat‐sunflower rotatione0
- Outcome
- yields of wheate0
- Direction
- highere0
- Comparator
- wheat‐sorghum rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wheat‐sunflower rotation resulted in more timely planting and higher yields of wheat than the wheat‐sorghum rotation.”
Claim · model-written summary
The authors expect wheat–sunflower rotation to increase total yields over systems with an extra fallow period.
- Taxon
- wheatTriticum aestivume0
- Treatment
- wheat‐sunflower rotatione0
- Outcome
- should increase total yieldse0
- Comparator
- systems involving an extra fallow periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The wheat‐sunflower rotation allows timely planting of wheat and sunflower, provides for two crops in 2 years, and thus should increase total yields as compared with systems involving an extra fallow period.”
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See all 1,414 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.