Abstract
Long-term research shows that phosphorus (P) and nitrogen (N) fertilizer must be applied to optimize production of irrigated grain sorghum in western Kansas. In 2019, N applied alone increased yields by 66 bu/a, whereas N and P applied together increased yields up to 85 bu/a. Averaged across the past 10 years, N and P fertilization increased sorghum yields up to 78 bu/a. Application of 160 lb/a N (with P) produced the maximum yield in 2019, which is slightly more than the 10-year average. Application of potassium (K) has had no effect on sorghum yield throughout the study period. Average grain N content reached a maximum of ~0.7 lb/bu while grain P content reached a maximum of 0.16 lb/bu (0.34 lb P2O5/bu) and grain K content reached a maximum of 0.19 lb/bu (0.23 lb K2O/bu). At the highest N, P, and K rate, apparent fertilizer recovery in the grain was 31% for N, 65% for P, and 38% for K.
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Claims 11
Claim · model-written summary
N alone increased 2019 sorghum yield by 66 bu/a.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2019, N applied alone increased yields by 66 bu/a”
t0“Grain Sorghum”
Claim · model-written summary
N and P together increased 2019 sorghum yield by up to 85 bu/a.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N and P applied together increased yields up to 85 bu/a”
t0“Grain Sorghum”
Claim · model-written summary
Across ten years, N and P fertilization increased yield up to 78 bu/a.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Averaged across the past 10 years, N and P fertilization increased sorghum yields up to 78 bu/a.”
Claim · model-written summary
160 lb/a N with P produced maximum 2019 yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 160 lb/a N (with P) produced the maximum yield in 2019”
t0“Grain Sorghum”
Claim · model-written summary
K application had no effect on sorghum yield across the study.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of potassium (K) has had no effect on sorghum yield throughout the study period.”
Claim · model-written summary
Average grain N content reached a maximum of about 0.7 lb/bu.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average grain N content reached a maximum of ~0.7 lb/bu”
t0“Grain Sorghum”
Claim · model-written summary
Grain P content reached a maximum of 0.16 lb/bu.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain P content reached a maximum of 0.16 lb/bu (0.34 lb P2O5/bu)”
t0“Grain Sorghum”
Claim · model-written summary
Grain K content reached a maximum of 0.19 lb/bu.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain K content reached a maximum of 0.19 lb/bu (0.23 lb K2O/bu)”
t0“Grain Sorghum”
Claim · model-written summary
At the highest fertilizer rates, apparent grain N recovery was 31%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the highest N, P, and K rate, apparent fertilizer recovery in the grain was 31% for N”
t0“Grain Sorghum”
Claim · model-written summary
At the highest fertilizer rates, apparent grain P recovery was 65%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“65% for P”
t0“Grain Sorghum”
Claim · model-written summary
At the highest fertilizer rates, apparent grain K recovery was 38%.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“38% for K”
t0“Grain Sorghum”
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