Biological contaminants in North American legume inoculants

Olsen, P. E.; Rice, W. A.; Collins, Mandy

doi:10.1016/0038-0717(95)98650-d

Cited by 39 publications

(16 citation statements)

References 2 publications

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“…Several quality assessments had shown that many biofertilisers evaluated do not have the manufacturers' declared microbial composition (Herridge et al, 2002;Herrmann et al, 2015;Singleton et al, 1997). In some situations, biofertilisers sold globally have been reported to contain no microbial species (Lupwayi et al, 2000;Olsen et al, 1995). These observations are corroborated by the results obtained in this study where some of the biofertilisers sampled did not have the expected microbes.…”

Section: Discussionsupporting

confidence: 89%

Insights into the microbial composition and potential efficiency of selected commercial biofertilisers

Raimi

Roopnarain

Chirima

et al. 2020

Heliyon

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This study investigated 13-commercial biofertilisers for their microbial contents and potential functional capabilities using a culture-based approach. Isolates obtained were identified by sequencing the partial I6S rRNA gene and ITS 1 and 2 regions and screened for plant growth-promoting capabilities. A total of 58 bacterial and three fungal isolates were obtained from all biofertilisers, with major genera being Bacillus, Rhizobium, Pseudomonas, Candida and Aspergillus. Five of the biofertilisers had the microbes (all or some) listed in the label detected while eight products had none detected. All the products had more microbes than that declared in the labels, suggesting the presence of potential contaminants. Generally, all the identified microbes, including the potential contaminants, had different beneficial capabilities. Approximately 40% of the isolates showed potential for nitrogenfixation, while 27% exhibited high phosphate-solubilisation ability. Additionally, 87% of the isolates produced indole acetic acid in the range of 0.1-114.4 μg/mL. High levels of siderophore production were mainly observed amongst Bacillus and Pseudomonas genera. The potential of the microbes, including those not listed in the label, to fix nitrogen and produce acid phosphatase, indole acetic acid and siderophore, was highest in four products. This suggests the products have multiple functional abilities in improving crop productivity. However, other qualities of biofertiliser, such as viable cell count and level of contamination, must always be within the acceptable standards. This will guarantee high product quality as well as efficiency when applied in the field. Overall, the results show that there is a high correlation between microbial compositions and potential capability of biofertilisers for plant-growth promotion.

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Section: Discussionsupporting

confidence: 89%

Insights into the microbial composition and potential efficiency of selected commercial biofertilisers

Raimi

Roopnarain

Chirima

et al. 2020

Heliyon

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“…However, the results of independent tests published from time to time (e.g. Olsen et al, 1995;Schall et al, 1975;Skipper et al, 1980;Vincent and Smith, 1982) indicate that substantial proportions of the inoculants examined appear unsatisfactory for farmer use because of low populations of rhizobia and/or high numbers of microbial contaminants. Nevertheless, it is not clear to what extent legume crop failures in the United States are attributable to poor quality inoculants.…”

Section: Inoculant Quality Controlmentioning

confidence: 86%

“…It is a paradox that, despite nearly 100 years of experience, most of the inoculant produced in the world today is of relatively poor quality (e.g. Olsen et al, 1995) and that frankly some of it is extremely bad. Even good quality inoculants are often not used to best advantage.…”

Section: Concluding Remarks Prospects and Prognosticationmentioning

confidence: 99%

Manipulation of rhizobia microflora for improving legume productivity and soil fertility: A critical assessment

1995

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“…A Canadian survey showed the contamination level sometimes exceeded, by several orders of magnitude, the level of rhizobia in the inoculant, indicating poor quality inoculants. In at least one study, it was shown that the contaminant species had detrimental effects on the rhizobia (Olsen et al 1994b). It is still unknown whether these bacterial contaminants present any health hazards to humans, animals, and plants.…”

Section: Regulation and Control Of Contamination Of Commercial Inoculmentioning

confidence: 99%

Brief Historical Background

Marti

2013

Theory of Structures

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An assessment of the current state of bacterial inoculants for contemporary agriculture in developed and developing countries is critically evaluated from the point of view of their actual status and future use. Special emphasis is given to two new concepts of inoculation, as yet unavailable commercially: (i) synthetic inoculants under development for plant-growth promoting bacteria (PGPB) (Bashan and Holguin, 1998), and (ii) inoculation by groups of associated bacteria. This review contains: A brief historical overview of bacterial inoculants; the rationale for plant inoculation with emphasis on developing countries and semiarid agriculture, and the concept and application of mixed inoculant; discussion of microbial formulation including optimization of carrier-compound characteristics, types of existing carriers for inoculants, traditional formulations, future trends in formulations using unconventional materials, encapsulated synthetic formulations, macro and micro formulations of alginate, encapsulation of beneficial bacteria using other materials, regulation and contamination of commercial inoculants, and examples of modem commercial bacterial inoculants; and a consideration of time constraints and application methods for bacterial inoculants, commercial production, marketing, and the prospects of inoculants in modern agriculture.

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Biological contaminants in North American legume inoculants

Cited by 39 publications

References 2 publications

Insights into the microbial composition and potential efficiency of selected commercial biofertilisers

Insights into the microbial composition and potential efficiency of selected commercial biofertilisers

Manipulation of rhizobia microflora for improving legume productivity and soil fertility: A critical assessment

Brief Historical Background

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