Abstract
Abstract: This study aimed to investigate effects of nitrogen (N) fertilizer rates and inoculation of rice seeds with N-fixing bacterium Gluconacetobacter diazotrophicus on the growth parameters and yield of OM5451 and OM6976 rice varieties in the Vietnamese Mekong Delta region. Nitrogen fertilizer rates of 50 kg N.ha-1 and 100 kg N.ha-1 were used, with latter reflecting farmer practice. Three rice seed inoculation methods were also employed: Seeds soaked in water for 24 hours and allowed to stand for 30 hours (control) (B0); Seeds soaked in water for 24 hours and inoculated with G. diazotrophicus for 30 hours (B1); Seeds soaked with G. diazotrophicus in water for 24 hours and allowed to stand for 30 hours. Applying 50 kg N.ha-1 without combining with NFB bacterium in this experiment generally resulted in less tillers, shorter plants, a lower SPAD index, and lower grain yield. Combining G. diazotrophicus bacterium with reduced N fertilizer of 50 kg N.ha-1 demonstrated rice growth and yield may be maintained in both varieties compared to 100 kg N.ha-1. These results providing a firm foundation for future research of adding NFB to paddy soils to decrease the N fertilizer requirement.
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Claims 4
Claim · model-written summary
Reducing N to 50 kg N.ha-1 without bacterial inoculation generally lowered tiller number and plant height.
- Taxon
- rice
Oryza sativat0 - Treatment
- 50 kg N.ha-1 without combining with NFB bacteriume0
- Outcome
- tillers, shorter plantse0
- Direction
- lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying 50 kg N.ha-1 without combining with NFB bacterium in this experiment generally resulted in less tillers, shorter plants, a lower SPAD index, and lower grain yield”
t0“rice varieties”
Claim · model-written summary
Reducing N to 50 kg N.ha-1 without bacterial inoculation generally lowered SPAD index and grain yield.
- Taxon
- riceOryza sativat0
- Treatment
- 50 kg N.ha-1 without combining with NFB bacteriume0
- Outcome
- SPAD index, and lower grain yielde0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying 50 kg N.ha-1 without combining with NFB bacterium in this experiment generally resulted in less tillers, shorter plants, a lower SPAD index, and lower grain yield”
t0“rice varieties”
Claim · model-written summary
Inoculation with G. diazotrophicus at 50 kg N.ha-1 may maintain growth relative to 100 kg N.ha-1.
- Taxon
- riceOryza sativae0
- Treatment
- G. diazotrophicus bacterium with reduced N fertilizer of 50 kg N.ha-1e0
- Interactor
- G. diazotrophicusGluconacetobacter diazotrophicuse0symbiont
- Outcome
- rice growthe0
- Direction
- maintainede0
- Comparator
- 100 kg N.ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combining G. diazotrophicus bacterium with reduced N fertilizer of 50 kg N.ha-1 demonstrated rice growth and yield may be maintained in both varieties compared to 100 kg N.ha-1”
Claim · model-written summary
Inoculation with G. diazotrophicus at 50 kg N.ha-1 may maintain yield relative to 100 kg N.ha-1.
- Taxon
- riceOryza sativae0
- Treatment
- G. diazotrophicus bacterium with reduced N fertilizer of 50 kg N.ha-1e0
- Interactor
- G. diazotrophicusGluconacetobacter diazotrophicuse0symbiont
- Outcome
- yielde0
- Direction
- maintainede0
- Comparator
- 100 kg N.ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combining G. diazotrophicus bacterium with reduced N fertilizer of 50 kg N.ha-1 demonstrated rice growth and yield may be maintained in both varieties compared to 100 kg N.ha-1”
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