Abstract
Abstract Sorghum [ Sorghum bicolor (L.) Moench] serves as a low‐cost alternative to corn ( Zea mays L.) in semi‐arid regions of the world because of its high N and water use efficiencies. However, there has been a concern regarding N loss to the atmosphere as nitrous oxide (N 2 O) from semi‐arid drylands. This study investigated various soil C and N components, including CO 2 and N 2 O emissions, and crop yield with a dairy compost (13.5 Mg ha −1 ) and four rates of chemical N fertilizer (0, 22.4, 44.8, and 67.3 kg ha −1 ) in dryland sorghum. There was no significant difference in soil C and N fractions among N fertilizer rates, although compost addition numerically increased soil C storage and 67.3 kg ha −1 N rate resulted the highest yield in both years. Potential nitrogen mineralization (PNM) was negatively related to crop yield and positively related to grain N content. Soils with greater inorganic N and PNM had a lower carbon dioxide (CO 2 ) emissions, while soils with greater potential C mineralization (PCM) had lower N 2 O emissions. The results of this study show no significant improvements in yield of dryland sorghum in the semi‐arid environment of southern Great Plains in the short term. However, compost and 44.8 kg N ha −1 applications appeared to be beneficial when both yield and quality were compared.
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Claims 9
Claim · model-written summary
Soil carbon and nitrogen fractions did not significantly differ among nitrogen fertilizer rates.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant difference in soil C and N fractions among N fertilizer rates”
t0“sorghum yield”
Claim · model-written summary
Compost addition numerically increased soil carbon storage.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost addition numerically increased soil C storage”
t0“sorghum yield”
Claim · model-written summary
The 67.3 kg ha −1 nitrogen rate gave the highest yield in both years.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“67.3 kg ha −1 N rate resulted the highest yield in both years”
t0“sorghum yield”
Claim · model-written summary
Potential nitrogen mineralization was negatively related to crop yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potential nitrogen mineralization (PNM) was negatively related to crop yield”
t0“sorghum yield”
Claim · model-written summary
Potential nitrogen mineralization was positively related to grain nitrogen content.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positively related to grain N content”
t0“sorghum yield”
e1“Potential nitrogen mineralization (PNM) was negatively related to crop yield and positively related to grain N content”
Claim · model-written summary
Soils with greater inorganic nitrogen and PNM had lower carbon dioxide emissions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils with greater inorganic N and PNM had a lower carbon dioxide (CO 2 ) emissions”
t0“sorghum yield”
Claim · model-written summary
Soils with greater potential carbon mineralization had lower nitrous oxide emissions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soils with greater potential C mineralization (PCM) had lower N 2 O emissions”
t0“sorghum yield”
Claim · model-written summary
Dryland sorghum yield showed no significant short-term improvement.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant improvements in yield of dryland sorghum in the semi‐arid environment of southern Great Plains in the short term”
Claim · model-written summary
The authors considered compost and 44.8 kg N ha −1 beneficial for combined yield and quality.
- Outcome
- compost and 44.8 kg N ha −1 applications appeared to be beneficiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compost and 44.8 kg N ha −1 applications appeared to be beneficial when both yield and quality were compared”
t0“sorghum yield”
The same questions in other papers
nitrogen · yield · SorghumPositive and negative results
263 papers in the same direction as this paper · 22 in the opposite direction · 4 reporting no difference from an alternative
- positive
- negative
- negative
286 papers more in this group
See all 290 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.