Abstract
Root zone N management can reduce N fertilizer input and avoid nitrate pollution in greenhouse tomato production; however, little information is available on how reduced N affects soil microbes, especially dominant bacteria populations in long-term continuous greenhouse systems. This study investigated the effects of different combinations of N and straw on the population size of soil total bacteria and two dominant bacteria (Pseudomonas spp. and Bacillus spp.), and microbial community structure in a 6-year greenhouse tomato trial. The treatments were basal fertilizer (10 t ha-1 chicken manure; control), conventional high N treatment [600 kg N ha-1], conventional high N treatment with wheat straw, reduced N treatment [300 kg N ha-1 less than conventional], and reduced N treatment with wheat straw. Six years of reduced mineral N fertilization did not lead to a decrease in fruit yield. Both mineral N fertilizer and straw increased the numbers of soil bacteria (Bacillus spp. and Pseudomonas spp.) compared with the control, but the numbers were not affected by the amount of mineral N fertilizer (high vs reduced). Different denaturing gradient gel electrophoresis patterns were evidence that soil bacterial communities were changed by N treatments and straw application, but little difference in bacterial diversity was detected between high N and reduced N treatments. These results indicated that a reduction in N fertilizer input was possible in greenhouse tomato production and was beneficial in sustainable agriculture.
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Claims 10
Claim · model-written summary
Reduced mineral N for six years did not decrease tomato fruit yield.
- Taxon
- tomato
Solanum lycopersicume2 - Treatment
- reduced mineral N fertilizatione0
- Outcome
- fruit yielde0
- Direction
- did not lead to a decreasee0
- Comparator
- conventional high N treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six years of reduced mineral N fertilization did not lead to a decrease in fruit yield.”
e2“in greenhouse tomato production; however”
e1“conventional high N treatment [600 kg N ha-1]”
Claim · model-written summary
Mineral N fertilizer increased soil Bacillus spp. numbers compared with control.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- mineral N fertilizere0
- Interactor
- Bacillus spp.e0other
- Outcome
- numbers of soil bacteria (Bacillus spp.e0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both mineral N fertilizer and straw increased the numbers of soil bacteria (Bacillus spp. and Pseudomonas spp.) compared with the control”
e2“in greenhouse tomato production; however”
Claim · model-written summary
Mineral N fertilizer increased soil Pseudomonas spp. numbers compared with control.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- mineral N fertilizere0
- Interactor
- Pseudomonas spp.
Pseudomonase0other - Outcome
- Pseudomonas spp.e0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both mineral N fertilizer and straw increased the numbers of soil bacteria (Bacillus spp. and Pseudomonas spp.) compared with the control”
e2“in greenhouse tomato production; however”
Claim · model-written summary
Straw increased soil Bacillus spp. numbers compared with control.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- strawe0
- Interactor
- Bacillus spp.e0other
- Outcome
- numbers of soil bacteria (Bacillus spp.e0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both mineral N fertilizer and straw increased the numbers of soil bacteria (Bacillus spp. and Pseudomonas spp.) compared with the control”
e2“in greenhouse tomato production; however”
Claim · model-written summary
Straw increased soil Pseudomonas spp. numbers compared with control.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- strawe0
- Interactor
- Pseudomonas spp.Pseudomonase0other
- Outcome
- Pseudomonas spp.e0
- Direction
- increasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both mineral N fertilizer and straw increased the numbers of soil bacteria (Bacillus spp. and Pseudomonas spp.) compared with the control”
e2“in greenhouse tomato production; however”
Claim · model-written summary
Soil bacterial numbers were unaffected by high versus reduced mineral N rate.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- amount of mineral N fertilizere0
- Outcome
- numberse0
- Direction
- not affectede0
- Comparator
- high vs reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the numbers were not affected by the amount of mineral N fertilizer (high vs reduced)”
e2“in greenhouse tomato production; however”
Claim · model-written summary
N treatments changed soil bacterial community patterns.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- N treatmentse0
- Outcome
- soil bacterial communitiese0
- Direction
- changede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil bacterial communities were changed by N treatments and straw application”
e2“in greenhouse tomato production; however”
Claim · model-written summary
Straw application changed soil bacterial community patterns.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- straw applicatione0
- Outcome
- soil bacterial communitiese0
- Direction
- changede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil bacterial communities were changed by N treatments and straw application”
e2“in greenhouse tomato production; however”
Claim · model-written summary
Bacterial diversity differed little between high and reduced N treatments.
- Taxon
- tomatoSolanum lycopersicume2
- Treatment
- reduced N treatmentse0
- Outcome
- bacterial diversitye0
- Direction
- little differencee0
- Comparator
- high Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“little difference in bacterial diversity was detected between high N and reduced N treatments.”
e2“in greenhouse tomato production; however”
Claim · model-written summary
The authors conclude that greenhouse tomato N fertilizer input can be reduced.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- a reduction in N fertilizer inpute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a reduction in N fertilizer input was possible in greenhouse tomato production”
The same questions in other papers
nitrogen · soil: biology · Solanum lycopersicum (tomato)Positive and negative results
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- positive
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- positive
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See all 978 papers →fertilization · Pseudomonas · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- positive
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.