Abstract
The demand for chemical fertilizers in agriculture has increased to deal with the present global population increase. However, the excessive use of chemical fertilizers can be reduced by applying biofertilizers as an eco-friendly tool. Plant growth-promoting rizobacteria (PGPR) has an essential need in terms of fertilizer savings and promoting plant yield. Here, we study the effect of using three (PGPR) bacterial strains “Bacillus nakamurai MSRH1, Bacillus pacificus MSRH3, Paenibacillus polymyxa MSRH5”, integrated with chemical fertilizers (40, 60, 80, 100% need based NPK) on vegetative growth, yield production, and quality of table grapes ‘Flam Seedless’ grown in sand soil during two successive seasons of 2020 and 2021, with a preliminary trial season in 2019. Our results show that amending grapes with NPK in combination with the consortium of three strains led to significant improvement in colonized vines compared to a single application of 100% NPK. Results showed that bacterial consortium combined with 80% and 60% NPK mineral fertilizer had more positive effects than un-inoculated vines in growth parameters, cluster characteristics, yield/vine and berry quality in the two growing seasons. Besides, N, P and K concentrations of leaf petiole, total leaf chlorophyll content, and carbohydrates in canes were significantly enhanced by bacteria consortium with 80% and 60% PK chemical fertilizers. PGPR significantly increased total bacterial count, N2-fixing, P- solubilizing and K-solubilizing bacteria in soil treated with the three strains of bacteria plus mineral fertilizer. In addition, dehydrogenase and phosphatase activity in the rhizosphere soil were also increased in treatments inoculated with strains plus mineral fertilizer. The field study results showed that PGPR approach has potential and can be considered as a crop management strategy to increase the yield and quality of grapes, reduce chemical fertilization and subsequent environmental pollution, and could be useful in terms of sustainable production.
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Claims 6
Claim · model-written summary
Consortium and NPK significantly improved vines over full NPK alone.
Verbatim
e0“amending grapes with NPK in combination with the consortium of three strains led to significant improvement in colonized vines compared to a single application of 100% NPK.”
Claim · model-written summary
Consortium with reduced NPK improved growth, cluster characteristics, yield and berry quality.
Verbatim
e0“bacterial consortium combined with 80% and 60% NPK mineral fertilizer had more positive effects than un-inoculated vines in growth parameters, cluster characteristics, yield/vine and berry quality in the two growing seasons.”
Claim · model-written summary
Consortium and reduced fertilizer enhanced petiole nutrients, leaf chlorophyll and cane carbohydrates.
- Treatment
- bacteria consortium with 80% and 60% PK chemical fertilizerse0
- Outcome
- N, P and K concentrations of leaf petiolee0
- Direction
- enhancede0
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine”
e0“N, P and K concentrations of leaf petiole, total leaf chlorophyll content, and carbohydrates in canes were significantly enhanced by bacteria consortium with 80% and 60% PK chemical fertilizers.”
Claim · model-written summary
PGPR increased soil bacterial groups.
- Treatment
- three strains of bacteria plus mineral fertilizere0
- Outcome
- total bacterial count, N2-fixing, P- solubilizing and K-solubilizing bacteria in soile0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine”
e0“PGPR significantly increased total bacterial count, N2-fixing, P- solubilizing and K-solubilizing bacteria in soil treated with the three strains of bacteria plus mineral fertilizer.”
Claim · model-written summary
Inoculation increased rhizosphere enzyme activities.
- Treatment
- inoculated with strains plus mineral fertilizere0
- Outcome
- dehydrogenase and phosphatase activity in the rhizosphere soile0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine”
e0“dehydrogenase and phosphatase activity in the rhizosphere soil were also increased in treatments inoculated with strains plus mineral fertilizer.”
Claim · model-written summary
PGPR was recommended to improve grape production while reducing fertilizer.
Verbatim
e0“PGPR approach has potential and can be considered as a crop management strategy to increase the yield and quality of grapes, reduce chemical fertilization and subsequent environmental pollution”
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