Changes in the physiological and agricultural characteristics of peat-based Bradyrhizobium japonicum inoculants after long-term storage

Revellin, Cécile; Meunier, G.; Giraud, Jean-Jacques; Sommer, Georges; Wadoux, Patrick; Catroux, Gérard

doi:10.1007/s002530000373

Cited by 21 publications

(6 citation statements)

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“…The correspondence of number of nodules with their weight in this work, especially in inoculated treatments, also confirms the findings of Lawson and Quainoo (2008) that nodule dry biomass followed the same pattern as the nodule count. Revellin et al (2000) also observed that higher numbers of nodules per plant resulted in higher plant biomass. The observation in this study of a significant high level of nodulation at full pod stage (a possible indication of increased N 2 fixation) contradicts the finding of Zapata et al (1987) that maximum N 2 fixation occurs between the flowering and early pod stages of soybean development.…”

Section: Discussionmentioning

confidence: 69%

Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril)

Lamptey¹,

Ahiabor²,

Yeboah³

et al. 2014

JAS

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The experiment was conducted during the 2012 farming season in the agricultural experimental field of the University for Development Studies, Nyankpala in the Northern Region of Ghana. The objective of the study was to determine the influence of Rhizobium inoculants and growth stages on shoot dry matter and grain yield of soybean. Two levels of inoculation regimes (inoculation (+In) and uninoculation (-In)) were combined with four sampling developmental stages (vegetative stage, flowering stage, pod stage and physiological maturity stage). The experimental design was a 2 x 4 factorial laid out in a Randomized Complete Block Design with eight treatments at four replications. Plants inoculated with Rhizobium and harvested at flowering stage recorded significantly higher fresh and dry shoot matter of 74.2 g and 23.57 g per plant, respectively as compared to plants that were not inoculated and harvested at the physiological maturity stage. The latter recorded the lowest fresh and dry shoot weights of 45.2 g and 15.5 g per plant, respectively. Rhizobium inoculation significantly increased grain yield (1262 kg/ha) compared to the yield obtained in the uninoculated treatments (1044 kg/ha). Grain yield positively correlated with plant height, plant stand, canopy spread, number and weight of nodules, number and weight of pods. From the results, it is recommended that soybean seeds should be inoculated with Rhizobium before planting in order to obtain higher grain yields. It is also recommended that for higher nodule numbers, which can be a good indication of higher N 2 fixation if the nodules are effective, and higher shoot biomass which is required for effective green manuring, soybean should be harvested at full pod stage.

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Section: Discussionmentioning

confidence: 69%

Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril)

Lamptey¹,

Ahiabor²,

Yeboah³

et al. 2014

JAS

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“…CMC and AE are the most common high molecular synthetic compounds for entrapped microbes [51, 52], can stick closely to coated materials, sustain live rhizobial cells, are harmless to cotyledons, and are not toxic in the environment [53, 54]. While many reports have focused on the ability of polymers to sustain rhizobia on legume seeds, especially on cowpea and soybean seeds [49, 55–58], their effects on root nodulation and N-fixation have not been well quantified. CMC is a cellulose-derived ester and pre-studies indicated that CMC has proper chemistry characteristics for stable microbe storage [48, 59, 60].…”

Section: Discussionmentioning

confidence: 99%

Molybdate in Rhizobial Seed-Coat Formulations Improves the Production and Nodulation of Alfalfa

et al. 2017

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Rhizobia-legume symbiosis is the most well researched biological nitrogen fixation system. Coating legume seeds with rhizobia is now a recognized practical measure for improving the production of legume corp. However, the efficacy of some commercial rhizobia inoculants cannot be guaranteed in China due to the low rate of live rhizobia in these products. A greenhouse experiment was conducted to assess the effects of different rhizobial inoculant formulations on alfalfa productivity and nitrogen fixation. Two rhizobia strains, (ACCC17631 and ACCC17676), that are effective partners with alfalfa variety Zhongmu No. 1 were assessed with different concentrations of ammonium molybdate in seed-coat formulations with two different coating adhesives. Our study showed that the growth, nodulation, and nitrogen fixation ability of the plants inoculated with the ACCC17631 rhizobial strain were greatest when the ammonium molybdate application was0.2% of the formulation. An ammonium molybdate concentration of 0.1% was most beneficial to the growth of the plants inoculated with the ACCC17676 rhizobial strain. The sodium carboxymethyl cellulose and sodium alginate, used as coating adhesives, did not have a significant effect on alfalfa biomass and nitrogen fixation. However, the addition of skimmed milk to the adhesive improved nitrogenase activity. These results demonstrate that a new rhizobial seed-coat formulation benefitted alfalfa nodulation and yield.

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“…Hume and Blair (1992) found a higher number of Bradyrhizobium viable cells, when using these types of inoculants in soils with low nitrate content in sites where grain yield approached 3.2 Mg ha −1 . Revellin et al (2000) subsequently demonstrated a higher number of nodules per plant and a larger response to inoculation with liquid inoculants in experiments where grain yield approached 4.7 Mg ha −1 , though this response was attained via comparison of inoculated versus uninoculated treatments on a field that had no previous soybean cropping history. Other sets of experiments in tropical soils without soybean history showed increases in N 2 fixation and nodule number when using sterile-peat or liquid inoculants , Thao et al, 2002 but these responses were observed at sites where the grain yields were no greater than 2.5 Mg ha −1 .…”

Section: Inoculation and Grain Yield Potentialmentioning

confidence: 99%

Nitrogen uptake, fixation and response to fertilizer N in soybeans: A review

Salvagiotti

Cassman

Specht

et al. 2008

Field Crops Research

855

638

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Although relationships among soybean (Glycine max [L.] Merr) seed yield, nitrogen (N) uptake, biological N 2 fixation (BNF), and response to N fertilization have received considerable coverage in the scientific literature, a comprehensive summary and interpretation of these interactions with specific emphasis on high yield environments is lacking. Six hundred and thirty-seven data sets (site-year-treatment combinations) were analyzed from field studies that had examined these variables and had been published in refereed journals from 1966 to 2006. A mean linear increase of 0.013 Mg soybean seed yield per kg increase in N accumulation in above-ground biomass was evident in these data. The lower (maximum N accumulation) and upper (maximum N dilution) boundaries for this relationship had slopes of 0.0064 and 0.0188 Mg grain kg −1 N, respectively. On an average, 50-60% of soybean N demand was met by biological N 2 fixation. In most situations the amount of N fixed was not sufficient to replace N export from the field in harvested seed. The partial N balance (fixed N in above-ground biomass − N in seeds) was negative in 80% of all data sets, with a mean net soil N mining of −40 kg N ha −1 . However, when an average estimated below-ground N contribution of 24% of total plant N was included, the average N balance was close to neutral (−4 kg N ha −1 ). The gap between crop N uptake and N supplied by BNF tended to increase at higher seed yields for which the associated crop N demand is higher. Soybean yield was more likely to respond to N fertilization in high-yield (>4.5 Mg ha −1 ) environments. A negative exponential relationship was observed between N fertilizer rate and N 2 fixation when N was applied on the surface or incorporated in the topmost soil layers. Deep placement of slow-release fertilizer below the nodulation zone, or late N applications during reproductive stages, may be promising alternatives for achieving a yield response to N fertilization in high-yielding environments. The results from many N fertilization studies are often confounded by insufficiently optimized BNF or other management factors that may have precluded achieving BNF-mediated yields near the yield potential ceiling. More studies will be needed to fully understand the extent to which the N requirements of soybean grown at potential yields levels can be met by optimizing BNF alone as opposed to supplementing BNF with applied N. Such optimization will require evaluating new inoculant technologies, greater temporal precision in crop and soil management, and most importantly, detailed measurements of the contributions of soil N, BNF, and the efficiency of fertilizer N uptake throughout the crop cycle. Such information is required to develop more reliable guidelines for managing both BNF and fertilizer N in high-yielding environments, and also to improve soybean simulation models.

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Changes in the physiological and agricultural characteristics of peat-based Bradyrhizobium japonicum inoculants after long-term storage

Cited by 21 publications

References 0 publications

Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril)

Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril)

Molybdate in Rhizobial Seed-Coat Formulations Improves the Production and Nodulation of Alfalfa

Nitrogen uptake, fixation and response to fertilizer N in soybeans: A review

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