Abstract
The rapid development of greenhouse horticulture has brought about a dramatic increase in the nitrate pollution of aquifers. The optimization of nitrogen application is an important tool to minimize nitrogen losses. The objective of this research was to assess the effect of different fertigation strategies, based on the reduction of the nitrogen applied and the use of a percentage of NH4+ as a nitrogen source, on the decrease in the environmental impact caused by the traditional system, as well as to evaluate if this is compatible with a high fruit yield (considering quantity and quality). Lycopersicum esculentum Mill cv. Forteza plants were grown in a polyethylene greenhouse. Tomato yield and quality were evaluated, along with leachates, which were collected by means of rigid plastic lysimeters. The proposed strategies did not reduce fruit yield. However, the reduction in the nitrate applied caused firmness and °Brix decrease, together with a diminution in titratable acidity until 124 days after transplanting. Nevertheless, these effects were not observed with the replacement of some of the NO3− by NH4+. The reduction in fertilizer inputs significantly improved water and nutrient (N, P and K) use efficiency. The treatment with NH4+ improved K use efficiency, compared to the conventional treatment, but P decreased. The highest NO3− and K leaching was detected in the traditional treatment.
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Claims 11
Claim · model-written summary
Proposed fertigation strategies did not reduce tomato fruit yield.
- Taxon
- Tomato Crops
Solanum lycopersicumt0 - Treatment
- proposed strategiese0
- Outcome
- fruit yielde0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The proposed strategies did not reduce fruit yield”
Claim · model-written summary
Reducing applied nitrate decreased tomato fruit firmness.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- reduction in the nitrate appliede0
- Outcome
- firmnesse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“the reduction in the nitrate applied caused firmness and °Brix decrease, together with a diminution in titratable acidity until 124 days after transplanting”
Claim · model-written summary
Reducing applied nitrate decreased tomato °Brix.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- reduction in the nitrate appliede0
- Outcome
- °Brixe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“the reduction in the nitrate applied caused firmness and °Brix decrease, together with a diminution in titratable acidity until 124 days after transplanting”
Claim · model-written summary
Reducing applied nitrate diminished titratable acidity until 124 days after transplanting.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- reduction in the nitrate appliede0
- Outcome
- titratable aciditye0
- Direction
- diminutione0
- Qualifier
- until 124 days after transplantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“the reduction in the nitrate applied caused firmness and °Brix decrease, together with a diminution in titratable acidity until 124 days after transplanting”
Claim · model-written summary
Replacing some nitrate with ammonium avoided those fruit quality declines.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- replacement of some of the NO3− by NH4+e0
- Outcome
- these effectse0
- Direction
- not observede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“these effects were not observed with the replacement of some of the NO3− by NH4+”
Claim · model-written summary
Reduced fertilizer input significantly improved water use efficiency.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- reduction in fertilizer inputse0
- Outcome
- watere0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The reduction in fertilizer inputs significantly improved water and nutrient (N, P and K) use efficiency”
Claim · model-written summary
Reduced fertilizer input significantly improved nutrient N, P and K use efficiency.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- reduction in fertilizer inputse0
- Outcome
- nutrient (N, P and K) use efficiencye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The reduction in fertilizer inputs significantly improved water and nutrient (N, P and K) use efficiency”
Claim · model-written summary
Ammonium treatment improved K use efficiency versus conventional treatment.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- treatment with NH4+e0
- Outcome
- K use efficiencye0
- Direction
- improvede0
- Comparator
- conventional treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The treatment with NH4+ improved K use efficiency, compared to the conventional treatment, but P decreased”
Claim · model-written summary
Ammonium treatment decreased P use efficiency versus conventional treatment.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- treatment with NH4+e0
- Outcome
- Pe0
- Direction
- decreasede0
- Comparator
- conventional treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The treatment with NH4+ improved K use efficiency, compared to the conventional treatment, but P decreased”
Claim · model-written summary
Traditional treatment had the highest nitrate leaching.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- traditional treatmente0
- Outcome
- NO3−e0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The highest NO3− and K leaching was detected in the traditional treatment”
Claim · model-written summary
Traditional treatment had the highest K leaching.
- Taxon
- Tomato CropsSolanum lycopersicumt0
- Treatment
- traditional treatmente0
- Outcome
- K leachinge0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato Crops”
e0“The highest NO3− and K leaching was detected in the traditional treatment”
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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.