Abstract
A study was conducted with the objective of investigating the effects of the interaction between the inoculation of the pre-sprouted seedlings with Azospirillum brasilenseand the nitrogen fertilization in topdressing on the development of sugarcane plants(Saccharum officinarum). Pre-sprouted sugarcane seedlings, produced from 3.0 cm long mini-stems of the RB867515 variety, were transplanted 25 days after sprouting into 12 L plastic pots. The treatments were arranged in a randomized block design, in a 2 × 5 factorial scheme: two inoculation treatments [without (control) and inoculation with Azospirillum brasilense] and five application rates of N fertilizer in topdressing (0, 30, 60, 90 and 120 mg dm–3of N), with four repetitions. The inoculation with A. brasilensewas carried out in transplanting the seedlings using 4 mL of the inoculum AzoTotal® per seedling, containing the strains AbV5 and AbV6. The nitrogen fertilization in topdressing was performed at 20 days after transplanting the seedlings as urea (45% of N). The results reported that the application of N fertilizer rates in topdressingresulted in a linear increase in plant height, stem diameter, number of leaves per plant, number of tillers and dry matter production of plants inoculated with A. brasilense.When the plants were not inoculated with A. brasilense, nitrogen fertilization resulted in an increase also in the number of leaves and tillers per plant. The use of A. brasilenseinoculation in pre-sprouted sugarcane seedlings has a beneficial effect on the development of plants only when associated with nitrogen fertilization in topdressing. Sugarcane plants not fertilized with N have a negative response to inoculation with A. brasilense, indicating the occurrence of possible phytotoxic effects on plant development up to 60 days after transplanting.
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Claims 4
Claim · model-written summary
Increasing nitrogen fertilizer rates linearly increased height, stem diameter, leaf and tiller numbers and dry matter in inoculated sugarcane.
- Taxon
- sugarcanee1
- Treatment
- N fertilizer rates in topdressinge0
- Interactor
- A. brasilense
Azospirillum brasilensee0symbiont - Outcome
- plant height, stem diameter, number of leaves per plant, number of tillers and dry matter productione0
- Direction
- linear increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of N fertilizer rates in topdressingresulted in a linear increase in plant height, stem diameter, number of leaves per plant, number of tillers and dry matter production of plants inoculated with A. brasilense”
e1“sugarcane plants(Saccharum officinarum)”
Claim · model-written summary
Without Azospirillum inoculation, nitrogen fertilizer increased leaves and tillers per plant.
- Taxon
- sugarcanee1
- Treatment
- nitrogen fertilizatione0
- Interactor
- A. brasilenseAzospirillum brasilensee0symbiont
- Outcome
- number of leaves and tillers per plante0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the plants were not inoculated with A. brasilense, nitrogen fertilization resulted in an increase also in the number of leaves and tillers per plant”
e1“sugarcane plants(Saccharum officinarum)”
Claim · model-written summary
Azospirillum inoculation benefited sugarcane development only with topdressed nitrogen.
- Taxon
- sugarcanee0
- Treatment
- A. brasilenseinoculatione0
- Interactor
- A. brasilenseAzospirillum brasilensee0symbiont
- Outcome
- development of plantse0
- Direction
- beneficial effecte0
- Qualifier
- only when associated with nitrogen fertilization in topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of A. brasilenseinoculation in pre-sprouted sugarcane seedlings has a beneficial effect on the development of plants only when associated with nitrogen fertilization in topdressing”
Claim · model-written summary
Without nitrogen fertilization, Azospirillum inoculation negatively affected sugarcane development up to 60 days after transplanting.
- Taxon
- Sugarcanee0
- Treatment
- inoculation with A. brasilensee0
- Interactor
- A. brasilenseAzospirillum brasilensee0symbiont
- Outcome
- plant developmente0
- Direction
- negative responsee0
- Value
- 60 dayse0
- Qualifier
- not fertilized with Ne0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sugarcane plants not fertilized with N have a negative response to inoculation with A. brasilense, indicating the occurrence of possible phytotoxic effects on plant development up to 60 days after transplanting”
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Azospirillum brasilense · growth · Saccharum officinarum (sugarcane)Positive and negative results
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inoculation · growth · Saccharum officinarum (sugarcane)Positive and negative results
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