Abstract
Abstract The use of a controlled release N source for the production of trellised tomatoes ( Lycopersicon esculentum ) which require frequent topdressings would be desirable. Three sulfur‐coated urea (SCU) materials having release rates of 11.4, 21.5, and 29.3% over a 7‐day period were compared to NH 4 NO 3 applied preplant or as multiple applications. Nitrogen rates were 392, 560, and 729 kg N/ha. Marketable yields from an application of SCU 11.4 at 392 or 560 kg N/ha were greater than with the same rate of N as NH 4 NO 3 either as preplant or split applications. When SCU 21.5 or SCU 29.3 was used, the yields were comparable to a single application of NH 4 NO 3 . Differences in fruit number per plot were not significantly related to treatments. However, there was a significant difference in average fruit weight which was correlated with total yield. Tissue N content was highest at the first sampling from a single application of NH 4 NO 3 and lowest from SCU 11.4 . However, at later sampling periods the N content was maintained at a higher level with SCU 11.4 . Although 729 kg N/ha as a single application of NH 4 NO 3 detrimentally affected plant growth and production, this effect was not noted with the sulfur‐coated urea materials.
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Claims 11
Claim · model-written summary
SCU 11.4 at 392 or 560 kg N/ha produced greater marketable yields than ammonium nitrate at the same rate.
- Taxon
- Tomatoes
Solanum lycopersicumt0 - Treatment
- SCU 11.4 at 392 or 560 kg N/hae0
- Outcome
- Marketable yieldse0
- Direction
- greatere0
- Comparator
- NH 4 NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marketable yields from an application of SCU 11.4 at 392 or 560 kg N/ha were greater than with the same rate of N as NH 4 NO 3 either as preplant or split applications”
t0“Tomatoes”
Claim · model-written summary
SCU 21.5 gave yields comparable to one ammonium nitrate application.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- SCU 21.5e0
- Outcome
- yieldse0
- Direction
- comparablee0
- Comparator
- single application of NH 4 NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When SCU 21.5 or SCU 29.3 was used, the yields were comparable to a single application of NH 4 NO 3”
t0“Tomatoes”
Claim · model-written summary
SCU 29.3 gave yields comparable to one ammonium nitrate application.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- SCU 29.3e0
- Outcome
- yieldse0
- Direction
- comparablee0
- Comparator
- single application of NH 4 NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When SCU 21.5 or SCU 29.3 was used, the yields were comparable to a single application of NH 4 NO 3”
t0“Tomatoes”
Claim · model-written summary
Fruit number per plot was not significantly related to treatments.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- treatmentse0
- Outcome
- fruit number per plote0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in fruit number per plot were not significantly related to treatments”
t0“Tomatoes”
Claim · model-written summary
Average fruit weight differed significantly among treatments.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- treatmentse0
- Outcome
- average fruit weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in fruit number per plot were not significantly related to treatments. However, there was a significant difference in average fruit weight which was correlated with total yield”
t0“Tomatoes”
Claim · model-written summary
Average fruit weight correlated with total yield.
- Taxon
- TomatoesSolanum lycopersicumt0
- Organ / stage
- fruite0
- Outcome
- total yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“average fruit weight which was correlated with total yield”
t0“Tomatoes”
Claim · model-written summary
At first sampling, tissue nitrogen was highest after a single ammonium nitrate application.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- single application of NH 4 NO 3e0
- Outcome
- Tissue N contente0
- Direction
- higheste0
- Qualifier
- first samplinge0
- Comparator
- SCU 11.4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue N content was highest at the first sampling from a single application of NH 4 NO 3 and lowest from SCU 11.4”
t0“Tomatoes”
Claim · model-written summary
At first sampling, tissue nitrogen was lowest with SCU 11.4.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- SCU 11.4e0
- Outcome
- Tissue N contente0
- Direction
- loweste0
- Qualifier
- first samplinge0
- Comparator
- single application of NH 4 NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tissue N content was highest at the first sampling from a single application of NH 4 NO 3 and lowest from SCU 11.4”
t0“Tomatoes”
Claim · model-written summary
At later samplings SCU 11.4 maintained higher tissue nitrogen.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- SCU 11.4e0
- Outcome
- N contente0
- Direction
- highere0
- Qualifier
- later sampling periodse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at later sampling periods the N content was maintained at a higher level with SCU 11.4”
t0“Tomatoes”
Claim · model-written summary
A single 729 kg N/ha ammonium nitrate application harmed tomato growth and production.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- 729 kg N/ha as a single application of NH 4 NO 3e0
- Outcome
- plant growth and productione0
- Direction
- detrimentally affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“729 kg N/ha as a single application of NH 4 NO 3 detrimentally affected plant growth and production”
t0“Tomatoes”
Claim · model-written summary
The growth and production harm seen with 729 kg N/ha ammonium nitrate was not observed with sulfur-coated urea.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- sulfur‐coated urea materialse0
- Outcome
- plant growth and productione0
- Direction
- not notede0
- Comparator
- NH 4 NO 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although 729 kg N/ha as a single application of NH 4 NO 3 detrimentally affected plant growth and production, this effect was not noted with the sulfur‐coated urea materials”
t0“Tomatoes”
The same questions in other papers
nitrogen · quality: postharvest · Solanum lycopersicum (tomato)Positive and negative results
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- no effect
- negative
- negative
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See all 34 papers →nitrogen · yield · Solanum lycopersicum (tomato)Positive and negative results
171 papers in the same direction as this paper · 31 in the opposite direction · 7 reporting no difference from an alternative
- negative
- negative
- negative
206 papers more in this group
See all 210 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.