Abstract
Background. Nitrogen fertilization of pastures is considered one of the main limiting factors and that most promote an increase in the production of forage biomass. For this reason, research that evaluates alternative techniques that can complement or supply the demand for N in forage becomes important. Recently, some researches have been studying the action of bacteria like Azospirillum brasilense, and their ability to make symbiotic associations with grasses, fixing atmospheric nitrogen and producing hormones that stimulate the growth of their roots. Objective. The aim of this work was to evaluate the development and production of Panicum maximum cv. Mombasa as a function of nitrogen (N) doses and inoculation with diazotrophic bacteria. Methodology. The experimental design was completely randomized (CRD), in 5 x 2 factorial scheme, in pots with capacity for 10 dm3 of soil, with four replicates. Treatments consisted of the combination of N doses (0, 50, 100, 150, 200 kg ha-1), using urea (45% N) as source, with and without inoculation with Azospirillum brasilense. The parameters evaluated were: SPAD index, leaf dry matter, leaf area, crude protein content (CP), root volume, root dry matter, stem dry matter and leaf/stem ratio. Results. Root volume, CP content, stem dry matter and green color index (SPAD) increased linearly as a function of the N doses. Only leaf/stem ratio and green color index responded to the inoculation with bacteria. Nitrogen fertilization directly contributes to promoting higher yields and fast establishment of the pasture. So, inoculation with Azospirillum brasilense leads to promising results in Panicum maximum cv. Mombasa, improving its leaf/stem ratio and SPAD index. However, it is not sufficient to promote higher forage production, so further research is needed with other grasses to confirm its efficiency, when associated with N. Conclusion. Nitrogen fertilization directly contributes to promoting higher yields and fast establishment of the pasture. Nitrogen doses between 100 and 150 kg ha-1 proved to be the most indicated for the development of P. maximum cv. Mombasa.
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Claims 6
Claim · model-written summary
Root volume, crude protein content and stem dry matter of Panicum maximum cv. Mombasa increased linearly with nitrogen doses.
- Taxon
- Panicum maximum cv. Mombasa
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Megathyrsus maximuse1 - Treatment
- N dosese2
- Outcome
- Root volume, CP content, stem dry mattere2
- Direction
- increased linearlye2
- Setting
- pots with capacity for 10 dm3 of soile4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“the development and production of Panicum maximum cv. Mombasa as a function of nitrogen (N) doses and inoculation with diazotrophic bacteria”
e2“Root volume, CP content, stem dry matter and green color index (SPAD) increased linearly as a function of the N doses”
e4“in pots with capacity for 10 dm3 of soil”
Claim · model-written summary
Green colour index (SPAD) of Panicum maximum cv. Mombasa increased linearly with nitrogen doses.
- Taxon
- Panicum maximum cv. MombasaMegathyrsus maximuse1
- Treatment
- N dosese2
- Outcome
- green color index (SPAD)e2
- Direction
- increased linearlye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the development and production of Panicum maximum cv. Mombasa as a function of nitrogen (N) doses and inoculation with diazotrophic bacteria”
e2“Root volume, CP content, stem dry matter and green color index (SPAD) increased linearly as a function of the N doses”
Claim · model-written summary
Inoculation with Azospirillum brasilense improved the leaf/stem ratio and SPAD index of Panicum maximum cv. Mombasa compared with no inoculation.
- Taxon
- Panicum maximum cv. MombasaMegathyrsus maximuse1
- Treatment
- inoculation with Azospirillum brasilensee5
- Interactor
- Azospirillum brasilense
Azospirillum brasilensee5symbiont - Outcome
- leaf/stem ratio and SPAD indexe6
- Direction
- improvinge6
- Comparator
- without inoculatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the development and production of Panicum maximum cv. Mombasa as a function of nitrogen (N) doses and inoculation with diazotrophic bacteria”
e5“with and without inoculation with Azospirillum brasilense”
e6“inoculation with Azospirillum brasilense leads to promising results in Panicum maximum cv. Mombasa, improving its leaf/stem ratio and SPAD index”
Claim · model-written summary
Inoculation with Azospirillum brasilense was not sufficient to promote higher forage production of Panicum maximum cv. Mombasa.
- Taxon
- Panicum maximum cv. MombasaMegathyrsus maximuse1
- Treatment
- inoculation with Azospirillum brasilensee5
- Interactor
- Azospirillum brasilenseAzospirillum brasilensee5symbiont
- Outcome
- forage productione7
- Direction
- not sufficient to promote highere7
- Comparator
- without inoculatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the development and production of Panicum maximum cv. Mombasa as a function of nitrogen (N) doses and inoculation with diazotrophic bacteria”
e5“with and without inoculation with Azospirillum brasilense”
e7“However, it is not sufficient to promote higher forage production”
Claim · model-written summary
Nitrogen fertilization promoted higher yields of the pasture (author conclusion).
- Taxon
- Panicum maximum cv. MombasaMegathyrsus maximuse1
- Treatment
- Nitrogen fertilizatione4
- Outcome
- yieldse4
- Direction
- highere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the development and production of Panicum maximum cv. Mombasa as a function of nitrogen (N) doses and inoculation with diazotrophic bacteria”
e4“Only leaf/stem ratio and green color index responded to the inoculation with bacteria. Nitrogen fertilization directly contributes to promoting higher yields and fast establishment of the pasture”
Claim · model-written summary
Nitrogen doses of 100 to 150 kg ha-1 are the most indicated for the development of Panicum maximum cv. Mombasa.
- Taxon
- P. maximum cv. MombasaMegathyrsus maximuse2
- Outcome
- Nitrogen dosese2
- Value
- between 100 and 150 kg ha-1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Nitrogen doses between 100 and 150 kg ha-1 proved to be the most indicated for the development of P. maximum cv. Mombasa”
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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.