Abstract
Crop residues play an important role in sustaining the productivity of many agroecosystems. A four year field study was conducted to determine the effects of sorghum [Sorghum bicolor (L.) Moench] cultivar, differential stover removal, and added fertilizer N on soil properties and crop yields in a continuous sorghum cropping system. The soil used was Ships clay (very-fine, mixed, thermic Udic Chromustert). Neither sorghum cultivar nor fertilizer N addition influenced soil pH, microaggregation, organic C, or extractable nutrients in this fine-textured Vertisol. Removing all stover significantly decreased soil organic matter (SOM) content and extractable P and K by 5.2, 10.0, and 4.0%, respectively, but did not affect soil microaggregation. In plots where all stover was removed annually and no fertilizer N was added, sorghum yields increased over time. Stover removal possibly disrupted SOM equilibrium, causing an estimated additional annual net release of 14 to 35 kg N and 1.7 to 4.1 kg P ha-'.
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Claims 9
Claim · model-written summary
Sorghum cultivar did not influence soil pH, microaggregation, organic C, or extractable nutrients.
- Treatment
- sorghum cultivare0
- Outcome
- soil pH, microaggregation, organic C, or extractable nutrientse0
- Direction
- Neithere0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither sorghum cultivar nor fertilizer N addition influenced soil pH, microaggregation, organic C, or extractable nutrients in this fine-textured Vertisol.”
Claim · model-written summary
Fertilizer N did not influence soil pH, microaggregation, organic C, or extractable nutrients.
- Treatment
- fertilizer N additione0
- Outcome
- soil pH, microaggregation, organic C, or extractable nutrientse0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither sorghum cultivar nor fertilizer N addition influenced soil pH, microaggregation, organic C, or extractable nutrients in this fine-textured Vertisol.”
Claim · model-written summary
Complete stover removal decreased soil organic matter by 5.2%.
- Taxon
- stovere0
- Treatment
- Removing all stovere0
- Outcome
- soil organic matter (SOM) contente0
- Direction
- decreasede0
- Value
- 5.2e0
Not reportedComparator
Verbatim
e0“Removing all stover significantly decreased soil organic matter (SOM) content and extractable P and K by 5.2, 10.0, and 4.0%, respectively, but did not affect soil microaggregation.”
Claim · model-written summary
Complete stover removal decreased extractable P by 10.0%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removing all stover significantly decreased soil organic matter (SOM) content and extractable P and K by 5.2, 10.0, and 4.0%, respectively, but did not affect soil microaggregation.”
e1“sorghum [Sorghum bicolor (L.) Moench]”
Claim · model-written summary
Complete stover removal decreased extractable K by 4.0%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removing all stover significantly decreased soil organic matter (SOM) content and extractable P and K by 5.2, 10.0, and 4.0%, respectively, but did not affect soil microaggregation.”
e1“sorghum [Sorghum bicolor (L.) Moench]”
Claim · model-written summary
Complete stover removal did not affect soil microaggregation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Removing all stover significantly decreased soil organic matter (SOM) content and extractable P and K by 5.2, 10.0, and 4.0%, respectively, but did not affect soil microaggregation.”
e1“sorghum [Sorghum bicolor (L.) Moench]”
Claim · model-written summary
Sorghum yields increased over time with annual complete stover removal and no fertilizer N.
- Outcome
- sorghum yieldse0
- Direction
- increasede0
- Qualifier
- all stover was removed annually and no fertilizer N was addede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In plots where all stover was removed annually and no fertilizer N was added, sorghum yields increased over time.”
Claim · model-written summary
Stover removal possibly caused extra annual net nitrogen release estimated at 14 to 35 kg N.
- Treatment
- Stover removale0
- Outcome
- additional annual net release of 14 to 35 kg Ne0
- Value
- 14 to 35 kg Ne0
- Qualifier
- possibly disrupted SOM equilibriume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stover removal possibly disrupted SOM equilibrium, causing an estimated additional annual net release of 14 to 35 kg N and 1.7 to 4.1 kg P ha-'.”
e1“sorghum [Sorghum bicolor (L.) Moench]”
Claim · model-written summary
Stover removal possibly caused extra annual net phosphorus release estimated at 1.7 to 4.1 kg P ha−1.
- Treatment
- Stover removale0
- Outcome
- additional annual net releasee0
- Value
- 1.7 to 4.1 kg P ha-'e0
- Qualifier
- possibly disrupted SOM equilibriume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stover removal possibly disrupted SOM equilibrium, causing an estimated additional annual net release of 14 to 35 kg N and 1.7 to 4.1 kg P ha-'.”
e1“sorghum [Sorghum bicolor (L.) Moench]”
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See all 118 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.