Abstract
Tomatoes (Lycopersicon esculentum Mill.) were grown on polyethylene-mulched beds of an Arredondo fine sand during two seasons to evaluate the effects of trickle-applied N and/or K, percentages of trickle-applied N and K (50%, 75%, and 100%), and schedules of N and K application on fruit yield, and leaf and shoot N and K concentrations. The daily irrigation requirement, calculated at 47% of the water evaporated from a U.S. Weather Service Class A pan (E pan ), was met by the application of 4.6 mm to 7.2 mm water/day. Fertilizer was injected weekly in a variable (2% to 12.5% of the total amount weekly) or constant (8.3% of the total amount weekly) schedule during the first 12 weeks of each season. Trickle-applied nutrients and trickle-applied percentage of nutrients interacted in their effects on early, midseason, and total marketable fruit yields. When N + K and N were trickle-applied, the mean early total marketable fruit yield decreased linearly from 25.3 t·ha -1 to 16.3 t·ha -1 as the trickle-applied percentage of nutrients increased from 50% to 100%; but when K was trickle-applied (100% preplant-applied N), yields were not affected by the trickle-applied percentage (mean 26.3 t·ha -1 ). The weekly schedule of N and K injection had no effect on fruit yield or other characteristics. Higher leaf N and K concentrations early in the season were obtained when the respective nutrient was 50% to 100% preplant-applied than when the respective nutrient was 75% to 100% trickle-applied; but late in the season, higher concentrations were obtained when the respective nutrient was trickle-applied. Higher yields, however, were associated with higher early season leaf N concentrations rather than with higher late-season leaf N or K concentrations.
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Claims 8
Claim · model-written summary
With trickle-applied N plus K, early marketable yield fell from 25.3 to 16.3 t·ha -1 as trickle percentage rose from 50% to 100%.
- Taxon
- Tomatoes
Solanum lycopersicumt0 - Treatment
- N + Ke0
- Outcome
- mean early total marketable fruit yielde0
- Direction
- decreased linearlye0
- Value
- 25.3 t·ha -1 to 16.3 t·ha -1e0
- Comparator
- 50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When N + K and N were trickle-applied, the mean early total marketable fruit yield decreased linearly from 25.3 t·ha -1 to 16.3 t·ha -1 as the trickle-applied percentage of nutrients increased from 50% to 100%”
t0“Tomatoes”
Claim · model-written summary
With trickle-applied N, early marketable yield fell from 25.3 to 16.3 t·ha -1 as trickle percentage rose from 50% to 100%.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- Ne0
- Outcome
- mean early total marketable fruit yielde0
- Direction
- decreased linearlye0
- Value
- 25.3 t·ha -1 to 16.3 t·ha -1e0
- Comparator
- 50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When N + K and N were trickle-applied, the mean early total marketable fruit yield decreased linearly from 25.3 t·ha -1 to 16.3 t·ha -1 as the trickle-applied percentage of nutrients increased from 50% to 100%”
t0“Tomatoes”
Claim · model-written summary
With trickle-applied K and preplant N, yield did not vary with trickle percentage; mean was 26.3 t·ha -1.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- K was trickle-appliede0
- Outcome
- yieldse0
- Direction
- not affectede0
- Value
- 26.3 t·ha -1e0
- Qualifier
- 100% preplant-applied Ne0
- Comparator
- trickle-applied percentagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when K was trickle-applied (100% preplant-applied N), yields were not affected by the trickle-applied percentage (mean 26.3 t·ha -1 )”
t0“Tomatoes”
Claim · model-written summary
Weekly N and K injection schedule did not affect yield or other characteristics.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- weekly schedule of N and K injectione0
- Outcome
- fruit yield or other characteristicse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The weekly schedule of N and K injection had no effect on fruit yield or other characteristics”
t0“Tomatoes”
Claim · model-written summary
Early leaf N concentration was higher after 50% to 100% preplant N than 75% to 100% trickle N.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- 50% to 100% preplant-appliede0
- Outcome
- leaf Ne0
- Direction
- Highere0
- Comparator
- 75% to 100% trickle-appliede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher leaf N and K concentrations early in the season were obtained when the respective nutrient was 50% to 100% preplant-applied than when the respective nutrient was 75% to 100% trickle-applied”
t0“Tomatoes”
Claim · model-written summary
Early leaf K concentration was higher after 50% to 100% preplant K than 75% to 100% trickle K.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- 50% to 100% preplant-appliede0
- Outcome
- K concentrationse0
- Direction
- Highere0
- Comparator
- 75% to 100% trickle-appliede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher leaf N and K concentrations early in the season were obtained when the respective nutrient was 50% to 100% preplant-applied than when the respective nutrient was 75% to 100% trickle-applied”
t0“Tomatoes”
Claim · model-written summary
Late-season leaf nutrient concentrations were higher with trickle application.
- Taxon
- TomatoesSolanum lycopersicumt0
- Treatment
- trickle-appliede0
- Outcome
- concentrationse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late in the season, higher concentrations were obtained when the respective nutrient was trickle-applied”
t0“Tomatoes”
Claim · model-written summary
Higher tomato yields were associated with higher early leaf N, rather than late leaf N or K.
- Taxon
- TomatoesSolanum lycopersicumt0
- Compound
- leaf Ne0
- Outcome
- yieldse0
- Direction
- Highere0
- Qualifier
- rather than with higher late-season leaf N or K concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher yields, however, were associated with higher early season leaf N concentrations rather than with higher late-season leaf N or K concentrations”
t0“Tomatoes”
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