Abstract
Abstract Crop and soil data were collected for 2 yr (1984–1985) from a soybean [ Glycine max (L.) Merr.]‐grain sorghum [ Sorghum bicolor (L.) Moench] rotation experiment established in 1974, to evaluate the residual effects of soybean on N uptake, some agronomic characters, and yield of the sorghum crop and residual soil N accumulation. The soil at the experimental site was a Sharpsburg silt clay loam (fine, montmorillonitic, mesic Typic Argiudoll). Fertilizer rates of 0, 56, 112, and 168 kg N ha −1 were applied to the sorghum crop in both the continuous sorghum and rotation cropping sequences. Total N uptake by sorghum was significantly increased by rotation cropping ( P <0.05) when the N fertilizer rate was 112 kg ha −1 or less. Sorghum grown in rotation or with the application of 56 kg N ha −1 or more flowered 6.1 days earlier than continuously grown sorghum without N. At the zero level of fertilizer N, sorghum after soybean yielded 85% more grain than did continuous sorghum. Rotation with soybean increased subsequent sorghum grain 14% compared to continuous sorghum when averaged over 2 yr. At or above the 112 kg N ha −1 level, differences between the cropping systems were not different. Estimates of residual soil N as NO − 3 −N in 1985 showed that after soybean there was 50 to 60 kg N ha −1 more than after continuous sorghum when 56 kg N ha −1 or less had been applied.
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Claims 7
Claim · model-written summary
Soybean rotation significantly increased sorghum total nitrogen uptake at fertilizer rates up to 112 kg ha −1.
- Treatment
- rotation croppinge0
- Outcome
- Total N uptakee0
- Direction
- increasede0
- Qualifier
- 112 kg ha −1 or lesse0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total N uptake by sorghum was significantly increased by rotation cropping ( P <0.05) when the N fertilizer rate was 112 kg ha −1 or less.”
Claim · model-written summary
Sorghum in rotation flowered earlier than continuous sorghum without nitrogen.
- Treatment
- rotatione0
- Outcome
- flowerede0
- Direction
- earliere0
- Value
- 6.1 dayse0
- Comparator
- continuously grown sorghum without Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum grown in rotation or with the application of 56 kg N ha −1 or more flowered 6.1 days earlier than continuously grown sorghum without N.”
Claim · model-written summary
Applying at least 56 kg N ha −1 made sorghum flower 6.1 days earlier than continuous sorghum without nitrogen.
- Treatment
- 56 kg N ha −1 or moree0
- Outcome
- flowerede0
- Direction
- earliere0
- Value
- 6.1 dayse0
- Comparator
- continuously grown sorghum without Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sorghum grown in rotation or with the application of 56 kg N ha −1 or more flowered 6.1 days earlier than continuously grown sorghum without N.”
Claim · model-written summary
Without fertilizer nitrogen, sorghum after soybean yielded 85% more grain than continuous sorghum.
- Treatment
- after soybeane0
- Outcome
- graine0
- Direction
- moree0
- Value
- 85%e0
- Qualifier
- zero level of fertilizer Ne0
- Comparator
- continuous sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the zero level of fertilizer N, sorghum after soybean yielded 85% more grain than did continuous sorghum.”
Claim · model-written summary
Averaged over two years, soybean rotation increased sorghum grain by 14%.
- Treatment
- Rotation with soybeane0
- Outcome
- sorghum graine0
- Direction
- increasede0
- Value
- 14%e0
- Qualifier
- averaged over 2 yre0
- Comparator
- continuous sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rotation with soybean increased subsequent sorghum grain 14% compared to continuous sorghum when averaged over 2 yr.”
Claim · model-written summary
Cropping systems did not differ at nitrogen rates of 112 kg N ha −1 or higher.
- Treatment
- cropping systemse0
- Outcome
- differences between the cropping systemse0
- Direction
- not differente0
- Qualifier
- At or above the 112 kg N ha −1 levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At or above the 112 kg N ha −1 level, differences between the cropping systems were not different.”
t0“Sorghum”
Claim · model-written summary
Following soybean, residual soil nitrate nitrogen was 50 to 60 kg N ha −1 higher than after continuous sorghum when fertilizer was at most 56 kg N ha −1.
- Treatment
- after soybeane0
- Outcome
- residual soil N as NO − 3 −Ne0
- Direction
- moree0
- Value
- 50 to 60 kg N ha −1e0
- Qualifier
- 56 kg N ha −1 or lesse0
- Comparator
- after continuous sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Estimates of residual soil N as NO − 3 −N in 1985 showed that after soybean there was 50 to 60 kg N ha −1 more than after continuous sorghum when 56 kg N ha −1 or less had been applied.”
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See all 7 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.