Abstract
Use efficiency of applied nitrogen (N) is estimated typically to be <50% in most crops. In sandy soils and warmer climates particularly, leaching and volatilization may be primary pathways for environmental loss of applied N. To determine the effect of N fertilization rate on the N use efficiency (NUE) and apparent recovery of N fertilizer (APR), a replicated field study with ‘BHN 602’ tomato ( Solanum lycopersicum ) grown in sandy soils under a fertigated plastic-mulched bed system was conducted using ammonium nitrate as the N source at four different rates (0, 150, 200, and 250 lb/acre). Spring tomato was followed by fall tomato in the same field, a typical cropping sequence in north Florida. Fertigation of N fertilizer was applied weekly in 13 equal doses for both seasons. The highest NUE was 12.05% (spring) and 32.38% (fall), and the highest APR was 6.11% (spring) for the lowest rate of N applied (150 lb/acre). In the fall, APR was unaffected by fertilizer N rates and ranged from 12.88% to 19.39%. Nitrogen accumulation in tomato plants were similar among the three N fertilizer rates applied (150, 200, and 250 lb/acre), though compared with no N fertilizer application, significant increases occurred. Whole plant N accumulation, NUE, and APR declined or remained similar when N rates increased above 150 lb/acre. Additionally, a regression analysis and derivative of the quadratic fresh yield data showed that yields were maximized at 162 and 233 lb/acre N in the spring and fall seasons, respectively.
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Claims 8
Claim · model-written summary
Tomato NUE reached 12.05% in spring and 32.38% in fall, its highest values.
- Taxon
- tomato
Solanum lycopersicume0 - Outcome
- NUEe1
- Value
- 12.05% (spring) and 32.38% (fall)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e1“The highest NUE was 12.05% (spring) and 32.38% (fall)”
Claim · model-written summary
The highest apparent N recovery in spring, 6.11%, occurred at the lowest N rate of 150 lb/acre.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- lowest rate of N applied (150 lb/acre)e2
- Outcome
- APRe2
- Value
- 6.11% (spring)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e2“the highest APR was 6.11% (spring) for the lowest rate of N applied (150 lb/acre)”
Claim · model-written summary
In fall, apparent N recovery was unaffected by fertilizer N rate and ranged from 12.88% to 19.39%.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- fertilizer N ratese3
- Outcome
- APRe3
- Direction
- no_changeinferrede3
- Value
- 12.88% to 19.39%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e3“In the fall, APR was unaffected by fertilizer N rates and ranged from 12.88% to 19.39%”
Claim · model-written summary
Nitrogen accumulation in tomato plants was similar among the three N fertilizer rates of 150, 200 and 250 lb/acre.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- three N fertilizer rates applied (150, 200, and 250 lb/acre)e4
- Outcome
- Nitrogen accumulatione4
- Direction
- no_changeinferrede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e4“Nitrogen accumulation in tomato plants were similar among the three N fertilizer rates applied (150, 200, and 250 lb/acre), though compared with no N fertilizer application, significant increases occurred”
Claim · model-written summary
Nitrogen accumulation in tomato plants increased significantly compared with no N fertilizer application.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- N fertilizer applicatione4
- Outcome
- Nitrogen accumulatione4
- Direction
- increasese4
- Comparator
- no N fertilizer applicatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e4“Nitrogen accumulation in tomato plants were similar among the three N fertilizer rates applied (150, 200, and 250 lb/acre), though compared with no N fertilizer application, significant increases occurred”
Claim · model-written summary
Whole plant N accumulation, NUE and APR declined or remained similar when N rates rose above 150 lb/acre.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- N rates increased above 150 lb/acree5
- Outcome
- Whole plant N accumulation, NUE, and APRe5
- Direction
- declinede5
- Comparator
- 150 lb/acree5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e5“Whole plant N accumulation, NUE, and APR declined or remained similar when N rates increased above 150 lb/acre”
Claim · model-written summary
Regression of the fresh yield data gave a maximum yield at 162 lb/acre N in spring.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- lb/acre Ne6
- Outcome
- yieldse6
- Direction
- maximizede6
- Value
- 162e6
- Setting
- springe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e6“a regression analysis and derivative of the quadratic fresh yield data showed that yields were maximized at 162 and 233 lb/acre N in the spring and fall seasons, respectively”
Claim · model-written summary
Regression of the fresh yield data gave a maximum yield at 233 lb/acre N in fall.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- lb/acre Ne6
- Outcome
- yieldse6
- Direction
- maximizede6
- Value
- 233e6
- Setting
- falle6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomato ( Solanum lycopersicum )”
e6“a regression analysis and derivative of the quadratic fresh yield data showed that yields were maximized at 162 and 233 lb/acre N in the spring and fall seasons, respectively”
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225 papers in the same direction as this paper · 38 in the opposite direction · 7 reporting no difference from an alternative
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See all 271 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.