Abstract
Abstract Head weight of winter glasshouse lettuce was increased slightly by higher temperature (7°C day/4°C night and 10°C day/7°C night) and carbon dioxide enrichment (350 and 1000 μl litre −1 ) but, despite faster growth, plant nitrate concentration was unaffected. Addition at the lowest rate (138 kg ha −1 N) of ammonium nitrate, calcium nitrate and urea increased plant nitrate by a similar amount compared with nil fertilizer nitrogen, but addition of more fertilizer (276 kg ha −1 N) had no further effect. Urea produced a lower yield than the other two N sources. Coated controlled‐release nitrogen produced both low yields and low plant nitrate concentrations because its nitrogen release rate was too slow to keep pace with plant growth. The most effective material in terms of high yield and low plant nitrate was one containing a nitrification inhibitor within the fertiliser granules.
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Claims 13
Claim · model-written summary
Higher temperature slightly increased head weight.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- higher temperaturee0
- Outcome
- Head weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head weight of winter glasshouse lettuce was increased slightly by higher temperature”
Claim · model-written summary
Carbon dioxide enrichment slightly increased head weight.
- Taxon
- lettuceLactuca sativae0
- Treatment
- carbon dioxide enrichmente0
- Outcome
- Head weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head weight of winter glasshouse lettuce was increased slightly by higher temperature (7°C day/4°C night and 10°C day/7°C night) and carbon dioxide enrichment (350 and 1000 μl litre −1 )”
Claim · model-written summary
Higher temperature did not change plant nitrate concentration.
- Taxon
- lettuceLactuca sativat0
- Treatment
- higher temperaturee1
- Outcome
- plant nitrate concentratione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“despite faster growth, plant nitrate concentration was unaffected”
e1“higher temperature”
t0“glasshouse lettuce”
Claim · model-written summary
Carbon dioxide enrichment did not change plant nitrate concentration.
- Taxon
- lettuceLactuca sativat0
- Treatment
- carbon dioxide enrichmente1
- Outcome
- plant nitrate concentratione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“despite faster growth, plant nitrate concentration was unaffected”
e1“carbon dioxide enrichment”
t0“glasshouse lettuce”
Claim · model-written summary
Low-rate ammonium nitrate increased plant nitrate relative to no nitrogen fertilizer.
- Taxon
- lettuceLactuca sativat0
- Treatment
- ammonium nitratee0
- Outcome
- plant nitratee0
- Direction
- increasede0
- Comparator
- nil fertilizer nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition at the lowest rate (138 kg ha −1 N) of ammonium nitrate, calcium nitrate and urea increased plant nitrate by a similar amount compared with nil fertilizer nitrogen”
t0“glasshouse lettuce”
Claim · model-written summary
Low-rate calcium nitrate increased plant nitrate relative to no nitrogen fertilizer.
- Taxon
- lettuceLactuca sativat0
- Treatment
- calcium nitratee0
- Outcome
- plant nitratee0
- Direction
- increasede0
- Comparator
- nil fertilizer nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition at the lowest rate (138 kg ha −1 N) of ammonium nitrate, calcium nitrate and urea increased plant nitrate by a similar amount compared with nil fertilizer nitrogen”
t0“glasshouse lettuce”
Claim · model-written summary
Low-rate urea increased plant nitrate relative to no nitrogen fertilizer.
- Taxon
- lettuceLactuca sativat0
- Treatment
- ureae0
- Outcome
- plant nitratee0
- Direction
- increasede0
- Comparator
- nil fertilizer nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition at the lowest rate (138 kg ha −1 N) of ammonium nitrate, calcium nitrate and urea increased plant nitrate by a similar amount compared with nil fertilizer nitrogen”
t0“glasshouse lettuce”
Claim · model-written summary
Additional fertilizer up to 276 kg ha −1 N did not further increase plant nitrate.
- Taxon
- lettuceLactuca sativat0
- Treatment
- more fertilizer (276 kg ha −1 N)e0
- Outcome
- plant nitratee1
- Direction
- no further effecte0
- Comparator
- lowest rate (138 kg ha −1 N)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“addition of more fertilizer (276 kg ha −1 N) had no further effect”
e1“lowest rate (138 kg ha −1 N) of ammonium nitrate, calcium nitrate and urea increased plant nitrate”
t0“glasshouse lettuce”
Claim · model-written summary
Urea yielded less than ammonium nitrate and calcium nitrate.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Ureae0
- Outcome
- yielde0
- Direction
- lowere0
- Comparator
- other two N sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea produced a lower yield than the other two N sources”
t0“glasshouse lettuce”
Claim · model-written summary
Controlled-release nitrogen produced low yields.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Coated controlled‐release nitrogene0
- Outcome
- yieldse0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Coated controlled‐release nitrogen produced both low yields and low plant nitrate concentrations”
t0“glasshouse lettuce”
Claim · model-written summary
Controlled-release nitrogen produced low plant nitrate concentrations.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Coated controlled‐release nitrogene0
- Outcome
- plant nitrate concentrationse0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Coated controlled‐release nitrogen produced both low yields and low plant nitrate concentrations”
t0“glasshouse lettuce”
Claim · model-written summary
The authors attributed low yield and nitrate under coated nitrogen to its slow release rate.
- Taxon
- lettuceLactuca sativat0
- Outcome
- plant growthe0
- Qualifier
- nitrogen release rate was too slowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“because its nitrogen release rate was too slow to keep pace with plant growth”
t0“glasshouse lettuce”
Claim · model-written summary
Fertilizer with an internal nitrification inhibitor best combined high yield with low nitrate.
- Taxon
- lettuceLactuca sativat0
- Treatment
- one containing a nitrification inhibitor within the fertiliser granulese0
- Outcome
- high yield and low plant nitratee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most effective material in terms of high yield and low plant nitrate was one containing a nitrification inhibitor within the fertiliser granules”
t0“glasshouse lettuce”
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See all 249 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.