Abstract
Grain sorghum [Sorghum bicolor (L.)], grown on the often infertile claypan soils of the eastern Great Plains, requires attention to soil fertility. Experimental objectives were to determine the effects of phosphorus (P) and potassium (K) fertility levels, N application, and legume residual on grain sorghum production and stalk rot. Following alfalfa and birdsfoot trefoil, first-year sorghum yield was 7 Mg ha−1 and not affected by N fertilizer. In subsequent years, yield increases due to N were less than 20%. Sorghum yield increased at low P and K rates, especially with nitrogen (N) fertilization and was greater following birdsfoot trefoil than following alfalfa. In 1995 when fertilized with N, lodging and stalk rot severity were increased by P and reduced by K. In 1996, stalk rot severity was reduced by K fertilization. Grain sorghum, grown after legume crops, required minimal levels of P and K, especially when N fertilizer was added.
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Claims 12
Claim · model-written summary
First-year sorghum yielded 7 Mg ha−1 after legumes.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following alfalfa and birdsfoot trefoil, first-year sorghum yield was 7 Mg ha−1”
Claim · model-written summary
Nitrogen did not affect first-year sorghum yield after legumes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“first-year sorghum yield was 7 Mg ha−1 and not affected by N fertilizer.”
Claim · model-written summary
In subsequent years nitrogen increased yield by under 20%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In subsequent years, yield increases due to N were less than 20%.”
t0“SORGHUM”
Claim · model-written summary
Low phosphorus rates increased sorghum yield.
- Treatment
- low Pe0
- Outcome
- Sorghum yielde0
- Direction
- increasede0
- Qualifier
- especially with nitrogen (N) fertilizatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum yield increased at low P and K rates, especially with nitrogen (N) fertilization”
Claim · model-written summary
Low potassium rates increased sorghum yield.
- Treatment
- K ratese0
- Outcome
- Sorghum yielde0
- Direction
- increasede0
- Qualifier
- especially with nitrogen (N) fertilizatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum yield increased at low P and K rates, especially with nitrogen (N) fertilization”
Claim · model-written summary
Sorghum yield was greater after birdsfoot trefoil than alfalfa.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum yield increased at low P and K rates, especially with nitrogen (N) fertilization and was greater following birdsfoot trefoil than following alfalfa.”
Claim · model-written summary
In 1995 under nitrogen, phosphorus increased lodging.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1995 when fertilized with N, lodging and stalk rot severity were increased by P and reduced by K.”
t0“SORGHUM”
Claim · model-written summary
In 1995 under nitrogen, phosphorus increased stalk rot severity.
- Treatment
- Pe0
- Outcome
- stalk rot severitye0
- Direction
- increasede0
- Qualifier
- In 1995 when fertilized with Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1995 when fertilized with N, lodging and stalk rot severity were increased by P and reduced by K.”
t0“SORGHUM”
Claim · model-written summary
In 1995 under nitrogen, potassium reduced lodging.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1995 when fertilized with N, lodging and stalk rot severity were increased by P and reduced by K.”
t0“SORGHUM”
Claim · model-written summary
In 1995 under nitrogen, potassium reduced stalk rot severity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1995 when fertilized with N, lodging and stalk rot severity were increased by P and reduced by K.”
t0“SORGHUM”
Claim · model-written summary
Potassium fertilization reduced stalk rot severity in 1996.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1996, stalk rot severity was reduced by K fertilization.”
t0“SORGHUM”
Claim · model-written summary
Sorghum after legume crops required minimal phosphorus and potassium, especially with nitrogen.
- Taxon
- Grain sorghum
Sorghum bicolore0 - Outcome
- minimal levels of P and Ke0
- Qualifier
- especially when N fertilizer was addede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain sorghum, grown after legume crops, required minimal levels of P and K, especially when N fertilizer was added.”
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See all 290 papers →8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.