Abstract
Abstract The effects of two organic (blood and bone, compost) and two inorganic (potassium nitrate, KNO 3 ; ammonium sulphate, (NH 4 ) 2 SO 4 ) forms of nitrogen (N) fertilisers on the yield and some quality indices of tomatoes were studied in a pot experiment using Waimairi peaty loam soil obtained from an area currently used for vegetable production. Four rates (0,150, 300, 600 kg N/ha, based on soil bulk density) of each fertiliser form were used. Fruit yield was significantly correlated with foliage N concentration, but not with fruit N concentration. Increasing rates of all N fertilisers, except compost, produced significant increases in fruit yield. Compared with the control, at 600 kg N/ha applied, compost increased fruit yield by 40% only whereas the other N fertilisers studied increased fruit yield by 120%. Fruit quality indices measured showed variable response to treatments. Fruit colour increased significantly on application of blood and bone, (NH 4 ) 2 SO 4 , and KNO 3 , whereas compost showed no effect. Fruit vitamin C concentrations decreased when all N fertilisers were applied. Increasing N rate produced significant negative linear trends with vitamin C concentration decreasing by 18–28% depending on the form applied. Fruit size was unaffected by treatments but visual quality of fruit decreased when N in any form was applied.
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Claims 13
Claim · model-written summary
Fruit yield correlated significantly with foliage nitrogen concentration.
- Taxon
- tomatoes
Solanum lycopersicumt0 - Organ / stage
- foliagee0
- Compound
- Ne0
- Outcome
- Fruit yielde0
- Direction
- correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit yield was significantly correlated with foliage N concentration, but not with fruit N concentration.”
t0“tomatoes”
Claim · model-written summary
Fruit yield did not correlate with fruit nitrogen concentration.
- Taxon
- tomatoesSolanum lycopersicumt0
- Organ / stage
- fruite0
- Compound
- Ne0
- Outcome
- Fruit yielde0
- Direction
- note0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit yield was significantly correlated with foliage N concentration, but not with fruit N concentration.”
t0“tomatoes”
Claim · model-written summary
Increasing nitrogen rates other than compost significantly increased tomato fruit yield.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- all N fertilisers, except composte0
- Outcome
- fruit yielde0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing rates of all N fertilisers, except compost, produced significant increases in fruit yield.”
t0“tomatoes”
Claim · model-written summary
Compost at 600 kg N/ha increased fruit yield by 40% against control.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- composte0
- Outcome
- fruit yielde0
- Direction
- increasede0
- Value
- 40%e0
- Qualifier
- 600 kg N/hae0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the control, at 600 kg N/ha applied, compost increased fruit yield by 40% only”
t0“tomatoes”
Claim · model-written summary
Other nitrogen fertilizers at 600 kg N/ha increased fruit yield by 120% against control.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- the other N fertiliserse0
- Outcome
- fruit yielde0
- Direction
- increasede0
- Value
- 120%e0
- Qualifier
- 600 kg N/hae0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the control, at 600 kg N/ha applied, compost increased fruit yield by 40% only whereas the other N fertilisers studied increased fruit yield by 120%.”
t0“tomatoes”
Claim · model-written summary
Blood and bone increased fruit colour significantly.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- blood and bonee0
- Outcome
- Fruit coloure0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit colour increased significantly on application of blood and bone, (NH 4 ) 2 SO 4 , and KNO 3”
t0“tomatoes”
Claim · model-written summary
Ammonium sulphate increased fruit colour significantly.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- (NH 4 ) 2 SO 4e0
- Outcome
- Fruit coloure0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit colour increased significantly on application of blood and bone, (NH 4 ) 2 SO 4 , and KNO 3”
t0“tomatoes”
Claim · model-written summary
Potassium nitrate increased fruit colour significantly.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- KNO 3e0
- Outcome
- Fruit coloure0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit colour increased significantly on application of blood and bone, (NH 4 ) 2 SO 4 , and KNO 3”
t0“tomatoes”
Claim · model-written summary
Compost showed no effect on fruit colour.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- composte0
- Outcome
- Fruit coloure0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit colour increased significantly on application of blood and bone, (NH 4 ) 2 SO 4 , and KNO 3 , whereas compost showed no effect.”
t0“tomatoes”
Claim · model-written summary
All nitrogen fertilizers decreased fruit vitamin C concentrations.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- all N fertiliserse0
- Outcome
- Fruit vitamin C concentrationse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit vitamin C concentrations decreased when all N fertilisers were applied.”
t0“tomatoes”
Claim · model-written summary
Increasing nitrogen rates produced significant negative linear trends in vitamin C concentration, decreasing it by 18–28%.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- Increasing N ratee0
- Outcome
- vitamin C concentratione0
- Direction
- decreasinge0
- Value
- 18–28%e0
- Qualifier
- depending on the form appliede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rate produced significant negative linear trends with vitamin C concentration decreasing by 18–28% depending on the form applied.”
t0“tomatoes”
Claim · model-written summary
Fruit size was unaffected by the treatments.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- treatmentse0
- Outcome
- Fruit sizee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit size was unaffected by treatments”
t0“tomatoes”
Claim · model-written summary
Nitrogen application in any form decreased visual fruit quality.
- Taxon
- tomatoesSolanum lycopersicumt0
- Treatment
- N in any forme0
- Outcome
- visual quality of fruite0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“visual quality of fruit decreased when N in any form was applied.”
t0“tomatoes”
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