Abstract
Abstract In a greenhouse experiment, tomato plants were grown in sand culture to test whether different fertilization regimes (mineral or organic fertilizers) at low (500 mg N plant –1 week –1 ) and high (750 mg N plant –1 week –1 ) nitrogen levels affected yield, nutritional quality, and taste of the fruits. In the mineral‐fertilizer treatments, nitrate‐ or ammonium‐dominated nutrient solutions were used. Organic fertilizer was supplied as fresh cut grass‐clover mulch (a total of 2.4 kg and 3.6 kg were given per plant at low and high N level, respectively) without ( orgN ) and with additional sulfur fertilization ( orgN+S ). Yields of red tomatoes from the organically fertilized plants were significantly lower (1.3–1.8 kg plant –1 ) than yields from plants that received mineral fertilizer (2.2–2.8 kg plant –1 ). At the final harvest, yields of green tomatoes in the organic treatment with extra sulfur were similar (1.1–1.2 kg plant –1 ) to the NO $ _3^- $ ‐dominated treatments at both nutrient levels and the NH $ _4^+ $ ‐dominated treatment at high nutrient level. Organic fertilizers released nutrients more slowly than mineral fertilizers, resulting in decreased S and P concentrations in the leaves, which limited growth and yield in the orgN treatments. Analysis of tomato fruits and plants as well as taste‐test results gave no conclusive answer on the relationship between sugar or acid contents in the fruits, macronutrient content of plant leaves and fruits, and perceived taste. Sugar contents were higher in the fruits given mineral fertilizer, whereas acid contents were higher in the fruits given organic fertilizer. Preference in taste was given to the tomatoes from plants fertilized with the nitrate‐dominated nutrient solution and to those given organic fertilizer with extra sulfur. Thus, a reduction in growth, which was expected to lead to a higher concentration of compounds like sugars and acids, did not result in better taste. Overall, it can be concluded that an appropriate nutrient supply is crucial to reach high yields and good taste.
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Claims 11
Claim · model-written summary
Organic fertilizer gave significantly lower red tomato yields than mineral fertilizer.
- Taxon
- tomatoes
Solanum lycopersicume0 - Treatment
- organically fertilizede0
- Outcome
- Yields of red tomatoese0
- Direction
- lowere0
- Value
- 1.3–1.8 kg plant –1e0
- Qualifier
- 2.2–2.8 kg plant –1e0
- Comparator
- mineral fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of red tomatoes from the organically fertilized plants were significantly lower (1.3–1.8 kg plant –1 ) than yields from plants that received mineral fertilizer (2.2–2.8 kg plant –1 )”
Claim · model-written summary
At final harvest, green tomato yields with organic fertilizer and extra sulfur were similar to specified mineral treatments.
- Taxon
- tomatoesSolanum lycopersicume0
- Treatment
- organic treatment with extra sulfure0
- Outcome
- yields of green tomatoese0
- Direction
- similare0
- Value
- 1.1–1.2 kg plant –1e0
- Comparator
- NO $ _3^- $ ‐dominated treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the final harvest, yields of green tomatoes in the organic treatment with extra sulfur were similar (1.1–1.2 kg plant –1 ) to the NO $ _3^- $ ‐dominated treatments at both nutrient levels and the NH $ _4^+ $ ‐dominated treatment at high nutrient level”
Claim · model-written summary
Organic fertilizer released nutrients more slowly than mineral fertilizer.
- Taxon
- tomatoesSolanum lycopersicumt0
- Outcome
- nutrients more slowlye0
- Direction
- more slowlye0
- Comparator
- mineral fertilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Organic fertilizers released nutrients more slowly than mineral fertilizers”
t0“tomatoes”
Claim · model-written summary
Organic fertilizer lowered leaf sulfur and phosphorus concentration, limiting tomato growth and yield.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- orgN treatmentse0
- Outcome
- growth and yielde0
- Qualifier
- decreased S and P concentrations in the leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting in decreased S and P concentrations in the leaves, which limited growth and yield in the orgN treatments”
t0“tomatoes”
Claim · model-written summary
Fruit and leaf composition and taste tests gave no conclusive relation between sugar, acid, macronutrients and perceived taste.
- Taxon
- tomatoesSolanum lycopersicumt0
- Organ / stage
- fruitse0
- Outcome
- perceived tastee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no conclusive answer on the relationship between sugar or acid contents in the fruits, macronutrient content of plant leaves and fruits, and perceived taste”
t0“tomatoes”
Claim · model-written summary
Mineral fertilizer produced higher fruit sugar content.
- Taxon
- tomatoesSolanum lycopersicumt0
- Organ / stage
- fruitse0
- Treatment
- mineral fertilizere0
- Outcome
- Sugar contentse0
- Direction
- highere0
- Comparator
- organic fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sugar contents were higher in the fruits given mineral fertilizer, whereas acid contents were higher in the fruits given organic fertilizer”
t0“tomatoes”
Claim · model-written summary
Organic fertilizer produced higher fruit acid content.
- Taxon
- tomatoesSolanum lycopersicumt0
- Organ / stage
- fruitse0
- Treatment
- organic fertilizere0
- Outcome
- acid contentse0
- Direction
- highere0
- Comparator
- mineral fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sugar contents were higher in the fruits given mineral fertilizer, whereas acid contents were higher in the fruits given organic fertilizer”
t0“tomatoes”
Claim · model-written summary
Taste preference favored tomatoes given nitrate-dominated nutrient solution.
- Taxon
- tomatoesSolanum lycopersicume0
- Treatment
- nitrate‐dominated nutrient solutione0
- Outcome
- Preference in tastee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preference in taste was given to the tomatoes from plants fertilized with the nitrate‐dominated nutrient solution”
Claim · model-written summary
Taste preference also favored tomatoes given organic fertilizer with extra sulfur.
- Taxon
- tomatoesSolanum lycopersicume0
- Treatment
- organic fertilizer with extra sulfure0
- Outcome
- Preference in tastee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preference in taste was given to the tomatoes from plants fertilized with the nitrate‐dominated nutrient solution and to those given organic fertilizer with extra sulfur”
Claim · model-written summary
Reduced tomato growth did not improve taste.
- Taxon
- tomatoesSolanum lycopersicumt0
- Organ / stage
- growthe0
- Outcome
- better tastee0
- Direction
- did not resulte0
- Qualifier
- a reduction in growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction in growth, which was expected to lead to a higher concentration of compounds like sugars and acids, did not result in better taste”
t0“tomatoes”
Claim · model-written summary
The authors conclude appropriate nutrient supply is crucial to obtain high yield and good taste.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- appropriate nutrient supplye0
- Outcome
- high yields and good tastee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an appropriate nutrient supply is crucial to reach high yields and good taste”
t0“tomatoes”
The same questions in other papers
fertilization · yield · Solanum lycopersicum (tomato)Positive and negative results
127 papers in the same direction as this paper · 850 in the opposite direction
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See all 978 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.