Abstract
The biological N fixation provided by diazotrophic bacteria may be an alternative for corn production in more sustainable or low-input agricultural systems. Therefore, this study aimed to evaluate the interactive effect of seed inoculation with Herbaspirillum seropedicae and nitrogen fertilization on the nitrogen use efficiency of different corn genotypes, through the technique of isotopic dilution of 15N. The experiment was carried out under controlled conditions in a greenhouse using a completely randomized design in a 3 × 2 × 2 factorial scheme with three corn hybrids: Maximus, P3646H and BRS3035, using inoculated and non-inoculated plants with two nitrogen doses (0.0 and 80 kg ha-1) and four replicates. At 35 days after emergence plants were collected, divided into root and shoots and analyzed with regard to root and shoot dry matter production, accumulated N in plant, N percentage and content coming from the fertilizer and use efficiency of N applied as a fertilizer. Results showed that there is a difference between corn genotypes concerning shoot dry matter production and percentage of N shoot coming from the fertilizer. Shoot dry matter production is influenced by H. seropedicae inoculation. This inoculation coupled with nitrogen fertilization promotes shoot N increments of about 32 and 62% for the hybrids P3646H and BRS3035, respectively. These hybrids showed increases of 34.3 and 64.4%, respectively, in N use efficiency when inoculated with H. seropedicae without the addition of N, what allows inferring that the BNF behaves as an important source of N to the system. Key words: Zea mays L., diazotrophic bacteria, 15N, nitrogen fertilization.
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Claims 6
Claim · model-written summary
Corn genotypes differed in shoot dry matter production and fertilizer-derived shoot nitrogen.
- Taxon
- corn
Zea mays subsp. mayse0 - Material
- corn genotypese0
- Outcome
- shoot dry matter production and percentage of N shoot coming from the fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“difference between corn genotypes concerning shoot dry matter production and percentage of N shoot coming from the fertilizer”
Claim · model-written summary
Inoculation influenced corn shoot dry matter production.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- H. seropedicae inoculatione0
- Interactor
- H. seropedicaeHerbaspirillum seropedicaee0symbiont
- Outcome
- Shoot dry matter productione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot dry matter production is influenced by H. seropedicae inoculation.”
e1“three corn hybrids: Maximus, P3646H and BRS3035”
Claim · model-written summary
Inoculation plus nitrogen fertilizer increased shoot nitrogen in P3646H by about 32%.
- Taxon
- cornZea mays subsp. mayse1
- Material
- P3646He0
- Treatment
- inoculation coupled with nitrogen fertilizatione0
- Interactor
- Herbaspirillum seropedicaeHerbaspirillum seropedicaee2symbiont
- Outcome
- shoot Ne0
- Direction
- incrementse0
- Value
- 32e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This inoculation coupled with nitrogen fertilization promotes shoot N increments of about 32 and 62% for the hybrids P3646H and BRS3035, respectively.”
e1“three corn hybrids: Maximus, P3646H and BRS3035”
e2“seed inoculation with Herbaspirillum seropedicae”
Claim · model-written summary
Inoculation plus nitrogen fertilizer increased shoot nitrogen in BRS3035 by about 62%.
- Taxon
- cornZea mays subsp. mayse1
- Material
- BRS3035e0
- Treatment
- inoculation coupled with nitrogen fertilizatione0
- Interactor
- Herbaspirillum seropedicaeHerbaspirillum seropedicaee2symbiont
- Outcome
- shoot Ne0
- Direction
- incrementse0
- Value
- 62%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This inoculation coupled with nitrogen fertilization promotes shoot N increments of about 32 and 62% for the hybrids P3646H and BRS3035, respectively.”
e1“three corn hybrids: Maximus, P3646H and BRS3035”
e2“seed inoculation with Herbaspirillum seropedicae”
Claim · model-written summary
Without added nitrogen, inoculation increased nitrogen use efficiency in P3646H by 34.3%.
- Taxon
- cornZea mays subsp. mayse2
- Material
- P3646He1
- Treatment
- inoculated with H. seropedicae without the addition of Ne0
- Interactor
- H. seropedicaeHerbaspirillum seropedicaee0symbiont
- Outcome
- N use efficiencye0
- Direction
- increasese0
- Value
- 34.3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These hybrids showed increases of 34.3 and 64.4%, respectively, in N use efficiency when inoculated with H. seropedicae without the addition of N”
e1“hybrids P3646H and BRS3035”
e2“three corn hybrids: Maximus, P3646H and BRS3035”
Claim · model-written summary
Without added nitrogen, inoculation increased nitrogen use efficiency in BRS3035 by 64.4%.
- Taxon
- cornZea mays subsp. mayse2
- Material
- BRS3035e1
- Treatment
- inoculated with H. seropedicae without the addition of Ne0
- Interactor
- H. seropedicaeHerbaspirillum seropedicaee0symbiont
- Outcome
- N use efficiencye0
- Direction
- increasese0
- Value
- 64.4%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These hybrids showed increases of 34.3 and 64.4%, respectively, in N use efficiency when inoculated with H. seropedicae without the addition of N”
e1“hybrids P3646H and BRS3035”
e2“three corn hybrids: Maximus, P3646H and BRS3035”
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