Abstract
ABSTRACT Increasing the crop yield of maize planted in the climate and soil conditions of the northeast region of Brazil can be accomplished with the use of biological inputs coupled with the application of lower doses of nitrogen (N) fertilizer. The objective of this work was to evaluate the yield of maize inoculated with two diazotrophic bacterial species under different N rates, during three consecutive years in an Inseptisol of Sergipe state, Brazil. The two bacterial species used were Azospirillum brasilense BR11005 (Sp245) and Herbaspirillum seropedicae BR11147 (ZAE94). N was applied in the form of urea at 0, 100, 200, and 300 kg ha-1. Under field conditions and depending on the year, the crop yield was limited by the rainfall regime. The inoculation associated with the 100 kg ha-1 N treatment with BR11147 and BR11005, increased productivity by 1,230 kg ha-1 and 614 hg ha-1, respectively. This corresponded to a 37% and 19% productivity increase, respectively, compared to the productivity of the uninoculated control. At zero N, inoculation increased grain yield of maize plants inoculated with BR11147 by 18%. Additionally, the N content of the index leaf inoculated with BR11005 increased by 10% over that of the uninoculated control.
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Claims 5
Claim · model-written summary
Inoculation with Herbaspirillum seropedicae BR11147 with 100 kg ha-1 N increased maize productivity by 1,230 kg ha-1 relative to the uninoculated control.
- Treatment
- inoculation associated with the 100 kg ha-1 N treatmente1
- Interactor
- Herbaspirillum seropedicae BR11147 (ZAE94)Herbaspirillum seropedicaee3symbiont
- Outcome
- productivitye1
- Direction
- increasede1
- Value
- 1,230 kg ha-1e1
- Comparator
- uninoculated controle2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e1“The inoculation associated with the 100 kg ha-1 N treatment with BR11147 and BR11005, increased productivity by 1,230 kg ha-1 and 614 hg ha-1, respectively”
e2“compared to the productivity of the uninoculated control”
e3“Azospirillum brasilense BR11005 (Sp245) and Herbaspirillum seropedicae BR11147 (ZAE94)”
Claim · model-written summary
Inoculation with Azospirillum brasilense BR11005 with 100 kg ha-1 N increased maize productivity by 614 hg ha-1 relative to the uninoculated control.
- Treatment
- inoculation associated with the 100 kg ha-1 N treatmente1
- Interactor
- Azospirillum brasilense BR11005 (Sp245)
Azospirillum brasilensee3symbiont - Outcome
- productivitye1
- Direction
- increasede1
- Value
- 614 hg ha-1e1
- Comparator
- uninoculated controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e1“The inoculation associated with the 100 kg ha-1 N treatment with BR11147 and BR11005, increased productivity by 1,230 kg ha-1 and 614 hg ha-1, respectively”
e2“compared to the productivity of the uninoculated control”
e3“Azospirillum brasilense BR11005 (Sp245) and Herbaspirillum seropedicae BR11147 (ZAE94)”
Claim · model-written summary
At zero N, inoculation with BR11147 increased maize grain yield by 18% relative to the uninoculated control.
- Treatment
- inoculatione4
- Interactor
- Herbaspirillum seropedicae BR11147 (ZAE94)Herbaspirillum seropedicaee3symbiont
- Outcome
- grain yielde4
- Direction
- increasede4
- Value
- 18%e4
- Qualifier
- At zero Ne4
- Comparator
- uninoculated controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e2“compared to the productivity of the uninoculated control”
e3“Azospirillum brasilense BR11005 (Sp245) and Herbaspirillum seropedicae BR11147 (ZAE94)”
e4“At zero N, inoculation increased grain yield of maize plants inoculated with BR11147 by 18%”
Claim · model-written summary
Inoculation with BR11005 increased leaf N content of maize by 10% over the uninoculated control.
- Organ / stage
- index leafe5
- Treatment
- inoculated with BR11005e5
- Interactor
- Azospirillum brasilense BR11005 (Sp245)Azospirillum brasilensee3symbiont
- Outcome
- N contente5
- Direction
- increasede5
- Value
- 10%e5
- Comparator
- uninoculated controle5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e3“Azospirillum brasilense BR11005 (Sp245) and Herbaspirillum seropedicae BR11147 (ZAE94)”
e5“the N content of the index leaf inoculated with BR11005 increased by 10% over that of the uninoculated control”
Claim · model-written summary
Under field conditions, maize yield was limited by the rainfall regime, depending on the year.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE”
e6“Under field conditions and depending on the year, the crop yield was limited by the rainfall regime”
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