Abstract
The excessive use of inorganic nitrogen (N) fertilizers in rice production poses significant environmental and economic challenges, particularly in intensive farming systems such as those in the Mekong Delta, Vietnam. This study aimed to evaluate the potential of Herbaspirillum seropedicae (H. seropedicae), an endophytic N-fixing bacterium, to enhance soil fertility, improve rice growth, and maintain yield while reducing N fertilizer inputs in Dai Thom 8 rice under field conditions. A randomized complete block design with five treatments, including different nitrogen reduction levels combined with bacterial inoculation, was employed. The results showed that treatments integrating H. seropedicae significantly improved soil properties, including soil organic matter, total nitrogen, and available nutrients, compared to the control. Growth parameters such as plant height, tiller density, and chlorophyll content were also enhanced, particularly in treatments with bacterial inoculation. Yield components, including grain number and filled grains per panicle, were significantly increased, leading to higher grain yield. The highest yield was observed in T5 (5.72 t ha−1), while T3 and T4 achieved comparable yields with reduced N inputs. Additionally, grain quality analysis revealed increased protein content without negatively affecting starch composition. These findings highlight the potential of H. seropedicae as a biofertilizer to improve N use efficiency and reduce dependency on chemical fertilizers. The study provides strong evidence for integrating microbial inoculants into sustainable rice production systems. Among the treatments, T3 (50% N reduction combined with bacterial inoculation) is recommended as the optimal strategy due to its balance between high yield and reduced input costs, contributing to environmentally friendly and economically viable agriculture.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Inoculation improved soil organic matter, total nitrogen and available nutrients relative to the control.
- Taxon
- rice
Oryza sativae0t0 - Treatment
- H. seropedicaee0
- Interactor
- H. seropedicaeHerbaspirillum seropedicaee0symbiont
- Outcome
- soil organic matter, total nitrogen, and available nutrientse0
- Direction
- improvede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“treatments integrating H. seropedicae significantly improved soil properties, including soil organic matter, total nitrogen, and available nutrients, compared to the control”
t0“Dai Thom 8 Rice”
Claim · model-written summary
Bacterial inoculation enhanced rice height and tiller density.
- Taxon
- riceOryza sativae0t0
- Treatment
- bacterial inoculatione0
- Outcome
- plant height, tiller densitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth parameters such as plant height, tiller density, and chlorophyll content were also enhanced, particularly in treatments with bacterial inoculation”
t0“Dai Thom 8 Rice”
Claim · model-written summary
Bacterial inoculation enhanced rice chlorophyll content.
- Taxon
- riceOryza sativae0t0
- Treatment
- bacterial inoculatione0
- Outcome
- chlorophyll contente0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth parameters such as plant height, tiller density, and chlorophyll content were also enhanced, particularly in treatments with bacterial inoculation”
t0“Dai Thom 8 Rice”
Claim · model-written summary
Grain number and filled grains per panicle increased significantly.
- Taxon
- riceOryza sativae0t0
- Outcome
- grain number and filled grains per paniclee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield components, including grain number and filled grains per panicle, were significantly increased, leading to higher grain yield”
t0“Dai Thom 8 Rice”
Claim · model-written summary
Grain yield was higher.
- Taxon
- riceOryza sativae0t0
- Outcome
- grain yielde0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leading to higher grain yield”
t0“Dai Thom 8 Rice”
Claim · model-written summary
T5 gave the highest yield, 5.72 t ha−1.
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield was observed in T5 (5.72 t ha−1)”
t0“Dai Thom 8 Rice”
Claim · model-written summary
T3 and T4 maintained comparable yields with reduced N inputs.
- Taxon
- riceOryza sativae0t0
- Treatment
- T3 and T4e0
- Outcome
- yieldse0
- Direction
- comparablee0
- Qualifier
- reduced N inputse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T3 and T4 achieved comparable yields with reduced N inputs”
t0“Dai Thom 8 Rice”
Claim · model-written summary
Grain protein content increased.
- Taxon
- riceOryza sativae0t0
- Outcome
- protein contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain quality analysis revealed increased protein content without negatively affecting starch composition”
t0“Dai Thom 8 Rice”
Claim · model-written summary
Starch composition was not negatively affected.
- Taxon
- riceOryza sativae0t0
- Outcome
- starch compositione0
- Direction
- without negatively affectinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“without negatively affecting starch composition”
t0“Dai Thom 8 Rice”
Claim · model-written summary
The authors recommend T3, combining a 50% N reduction with inoculation, as the optimal balance of yield and input cost.
- Taxon
- RiceOryza sativat0
- Treatment
- T3 (50% N reduction combined with bacterial inoculation)e0
- Outcome
- optimal strategye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“T3 (50% N reduction combined with bacterial inoculation) is recommended as the optimal strategy due to its balance between high yield and reduced input costs”
t0“Dai Thom 8 Rice”
The same questions in other papers
Herbaspirillum seropedicae · nutrient: content · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
inoculation · physiology: pigments · Oryza sativa (rice)Positive and negative results
63 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- no effect
63 papers more in this group
See all 67 papers →inoculation · yield · Oryza sativa (rice)Positive and negative results
381 papers in the same direction as this paper · 31 in the opposite direction · 5 reporting no difference from an alternative
- negative
- negative
- no effect
414 papers more in this group
See all 418 papers →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.