Abstract
Improvements in nitrogen use efficiency (NUE) reduce stress on the environment and improve vegetable production. The effects of the application rate and injection timing of nitrogen (N) on the net photosynthetic rate (Pn), soil enzyme activities, yield (Y), water use efficiency (WUE), and nitrogen use efficiency (NUE) of tomato were studied by conducting an experiment with a split block design in which N was applied at different rates (150 kgha -1 , N1; 200 kgha -1 , N2; and 250 kgha -1 , N3) and timings (first 1/3 of irrigation, S1; middle 1/3 of irrigation, S2; and last 1/3 of irrigation, S3); no N fertilizer was applied in the control. The results showed an appropriate N application rate (i.e., not too high or low) can improve Pn and soil enzyme activity. The Y and WUE of greenhouse tomato increased non-linearly with the increase in N application rate, but NUE first increased and then decreased as the N application rate increased. Compare to S1, S2 and S3 improved the Pn, soil enzyme activities, Y, WUE, and NUE of tomato. These results could be used to promote N conservation and high Y of facility agriculture crops.
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Claims 9
Claim · model-written summary
An appropriate nitrogen rate improved tomato net photosynthetic rate.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- an appropriate N application ratee0
- Outcome
- Pne0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an appropriate N application rate (i.e., not too high or low) can improve Pn and soil enzyme activity”
e1“of tomato were studied”
Claim · model-written summary
An appropriate nitrogen rate improved soil enzyme activity.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- an appropriate N application ratee0
- Outcome
- soil enzyme activitye0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an appropriate N application rate (i.e., not too high or low) can improve Pn and soil enzyme activity”
e1“of tomato were studied”
Claim · model-written summary
Tomato yield increased nonlinearly with nitrogen rate.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- N application ratee0
- Outcome
- Ye0
- Direction
- increased non-linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Y and WUE of greenhouse tomato increased non-linearly with the increase in N application rate”
Claim · model-written summary
Tomato water use efficiency increased nonlinearly with nitrogen rate.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- N application ratee0
- Outcome
- WUEe0
- Direction
- increased non-linearlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Y and WUE of greenhouse tomato increased non-linearly with the increase in N application rate”
Claim · model-written summary
Tomato nitrogen use efficiency first increased then decreased with increasing nitrogen rate.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- N application ratee0
- Outcome
- NUEe0
- Direction
- first increased and then decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NUE first increased and then decreased as the N application rate increased”
e1“of tomato were studied”
Claim · model-written summary
Middle-third nitrogen injection improved tomato net photosynthetic rate against first-third injection.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compare to S1, S2 and S3 improved the Pn, soil enzyme activities, Y, WUE, and NUE of tomato”
e1“middle 1/3 of irrigation, S2; and last 1/3 of irrigation, S3”
e2“first 1/3 of irrigation, S1”
Claim · model-written summary
Last-third nitrogen injection improved tomato net photosynthetic rate against first-third injection.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compare to S1, S2 and S3 improved the Pn, soil enzyme activities, Y, WUE, and NUE of tomato”
Claim · model-written summary
Middle-third nitrogen injection improved tomato soil enzyme activity, yield, water use efficiency and nitrogen use efficiency against first-third injection.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- S2e0
- Outcome
- soil enzyme activities, Y, WUE, and NUEe0
- Direction
- improvede0
- Comparator
- S1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compare to S1, S2 and S3 improved the Pn, soil enzyme activities, Y, WUE, and NUE of tomato”
Claim · model-written summary
Last-third nitrogen injection improved tomato soil enzyme activity, yield, water use efficiency and nitrogen use efficiency against first-third injection.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- S3e0
- Outcome
- soil enzyme activities, Y, WUE, and NUEe0
- Direction
- improvede0
- Comparator
- S1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compare to S1, S2 and S3 improved the Pn, soil enzyme activities, Y, WUE, and NUE of tomato”
The same questions in other papers
nitrogen · soil: biology · Solanum lycopersicum (tomato)Positive and negative results
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- no effect
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See all 7 papers →nitrogen · physiology: photosynthesis · Solanum lycopersicum (tomato)Positive and negative results
11 papers in the same direction as this paper · 5 in the opposite direction
- positive
- negative
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See all 17 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.