Abstract
Increasing grain sorghum [ Sorghum bicolor (L.) Moench] acreage in Missouri and the subsequent soybean [ Glycine max (L.) Merr.]‐sorghum rotation acreage offers producers an opportunity to economize on N inputs. Soybean‐sorghum rotation experiments were conducted from 1980 to 1987 to determine the amount of N that can be credited from soybeans when rotated with grain sorghum. Studies were conducted at two locations, (Columbia and Novelty) in central and northeastern Missouri on a Putnam silt loam (fine, montmorillonitic, mesic Mollic Albaqualf) and a Mexico silt loam (fine, montmorillonitic, mesic Udollic Ochraqualf). Experiments consisted of application of 0, 40, 80, 120, and 160 lb N/acre to continuous sorghum and sorghum‐soybean rotation blocks. Grain yields were significantly increased from fertilizer N in both rotations in all years, but a significantly different response to fertilizer N between rotations was observed all years except for 1980 at Columbia. At the optimum N rate for each rotation, the sorghum following soybeans outyielded continuous sorghum by 439 lb/acre at Novelty and 804 lb/acre at Columbia. This higher yield can be attributed to the added benefits of rotation. Grain protein also was increased in the sorghum‐soybean rotation compared with continuous sorghum. At Novelty, the 80 lb/acre N rate in continuous sorghum produced yields comparable to the 0 N rate in the rotated sorghum. At Columbia, in 1980, yield from rotated sorghum was equal to yield with 40 lb N/acre from continuous sorghum; and in 1982 and 1984, yield from 0 N rotated sorghum exceeded yield of continuous sorghum at all N rates. Based on relative yields at the maximum profit N rate, the average fertilizer N credit between the two locations attributed to soybeans was about 84 lb N/acre.
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Claims 9
Claim · model-written summary
Fertilizer nitrogen significantly increased sorghum grain yield in both rotations.
- Taxon
- grain sorghum
Sorghum bicolort0 - Treatment
- fertilizer Ne0
- Outcome
- Grain yieldse0
- Direction
- increasede0
- Qualifier
- both rotations in all yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields were significantly increased from fertilizer N in both rotations in all years”
t0“grain sorghum [ Sorghum bicolor (L.) Moench]”
Claim · model-written summary
Nitrogen response differed significantly between rotations except Columbia in 1980.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- fertilizer Ne0
- Outcome
- response to fertilizer Ne0
- Direction
- differente0
- Qualifier
- except for 1980e0
- Setting
- Columbiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significantly different response to fertilizer N between rotations was observed all years except for 1980 at Columbia”
t0“grain sorghum [ Sorghum bicolor (L.) Moench]”
Claim · model-written summary
At optimum nitrogen, rotated sorghum outyielded continuous sorghum by 439 lb/acre at Novelty.
- Treatment
- following soybeanse0
- Outcome
- outyieldede0
- Direction
- outyieldede0
- Value
- 439 lb/acree0
- Comparator
- continuous sorghume0
- Setting
- Noveltye0
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum following soybeans outyielded continuous sorghum by 439 lb/acre at Novelty and 804 lb/acre at Columbia”
Claim · model-written summary
At optimum nitrogen, rotated sorghum outyielded continuous sorghum by 804 lb/acre at Columbia.
- Treatment
- following soybeanse0
- Outcome
- outyieldede0
- Direction
- outyieldede0
- Value
- 804 lb/acree0
- Comparator
- continuous sorghume0
- Setting
- Columbiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sorghum following soybeans outyielded continuous sorghum by 439 lb/acre at Novelty and 804 lb/acre at Columbia”
Claim · model-written summary
Soybean rotation increased grain protein relative to continuous sorghum.
- Treatment
- sorghum‐soybean rotatione0
- Outcome
- Grain proteine0
- Direction
- increasede0
- Comparator
- continuous sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein also was increased in the sorghum‐soybean rotation compared with continuous sorghum.”
Claim · model-written summary
At Novelty, continuous sorghum with 80 lb/acre N yielded comparably to rotated sorghum without N.
- Treatment
- 80 lb/acre N ratee0
- Outcome
- yieldse0
- Direction
- comparablee0
- Comparator
- 0 N rate in the rotated sorghume0
- Setting
- Noveltye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Novelty, the 80 lb/acre N rate in continuous sorghum produced yields comparable to the 0 N rate in the rotated sorghum.”
Claim · model-written summary
At Columbia in 1980, rotated sorghum yield equaled continuous sorghum with 40 lb N/acre.
- Treatment
- rotated sorghume0
- Outcome
- yielde0
- Direction
- equale0
- Qualifier
- 1980e0
- Comparator
- 40 lb N/acre from continuous sorghume0
- Setting
- Columbiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Columbia, in 1980, yield from rotated sorghum was equal to yield with 40 lb N/acre from continuous sorghum”
Claim · model-written summary
At Columbia in 1982 and 1984, unfertilized rotated sorghum exceeded continuous sorghum at every nitrogen rate.
- Treatment
- 0 N rotated sorghume0
- Outcome
- yielde0
- Direction
- exceedede0
- Qualifier
- 1982 and 1984e0
- Comparator
- continuous sorghum at all N ratese0
- Setting
- Columbiat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 1982 and 1984, yield from 0 N rotated sorghum exceeded yield of continuous sorghum at all N rates”
t0“At Columbia, in 1980”
Claim · model-written summary
The mean fertilizer N credit from soybeans was about 84 lb N/acre.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average fertilizer N credit between the two locations attributed to soybeans was about 84 lb N/acre”
t0“Sorghum”
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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.