Reinoculation in Topdressing of Rhizobium tropici, Azospirillum brasilense, and the Micronutrients Mo/Co in Common Bean

Reinoculation in Topdressing of Rhizobium tropici, Azospirillum brasilense, and the Micronutrients Mo/Co in Common Bean

Biological nitrogen fixation (BNF) can provide the necessary nitrogen for bean crops; however, for this to occur, important limitations involving the inoculant application technology need to be overcome.The use of co-inoculation is a management technique used to obtain benefits and increase the pote...

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Bibliographic Details
Published in:Agronomy (Basel) Vol. 14; no. 7; p. 1368
Main Authors: Ribeiro, Brenda B.A., Teixeira, Itamar R., Silva, Gisele C., Bravo, Tamires Ester P., Cunha, Nathan Mickael B., Benício Neto, Maurílio R., Alves, Gessiele P.C., Sbroggio Filho, Alexandre M., Reis, Elton F.
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-07-2024
Subjects:
Agricultural production
Bacteria
Beans
co-inoculation
Crop yield
Crops
Fertilization
Grain
Inoculation
inoculum
Leaf area
Leaves
Legumes
Micronutrients
Microorganisms
Mineral fertilizers
Molybdenum
Nitrogen
Nitrogen fixation
Nitrogenation
Nodulation
Nodules
Nutrients
Nutrition
Phaseolus vulgaris
Plant growth
Planting
Plants
Plants (botany)
yield
Brazil
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Summary:Biological nitrogen fixation (BNF) can provide the necessary nitrogen for bean crops; however, for this to occur, important limitations involving the inoculant application technology need to be overcome.The use of co-inoculation is a management technique used to obtain benefits and increase the potential of N2 fixation from the association between bacteria from the rhizobia group, such as R. tropici, and bacteria that promote plant growth, such as A. brasilense, in association with the addition of nutrients that allow greater efficiency of bacteria fixing atmospheric N2. This study aimed to evaluate the bean response to the reinoculation of R. tropici in co-inoculation with A. brasilense in a mixture with the micronutrients Co/Mo, in the winter season of 2021, in Anápolis-GO, Brazil. A randomized block design was used, with four replications, and the following treatments (TRs) were studied: TR1—reinoculation with R. tropici; TR2—reinoculation with co-inoculation of R. tropici + A. brasilense; TR3—reinoculation of R. tropici + Mo/Co micronutrients; TR4—reinoculation with co-inoculation R. tropici + A. brasilense + Mo/Co micronutrients; TR5—inoculation via seed, without reinoculation; TR6—mineral N fertilization in the sowing furrow and topdressing; TR7—control, without any N source. At stage R6, nodulation characteristics (number and dry mass of nodules) and the morphophysiological parameters of the plants (main root length, root dry mass, plant height, shoot dry mass, leaf area, and leaf N content in the shoot) were evaluated. At harvest, the final plant stand and components (number of pods per plant, number of grains per pod, and average weight of one hundred grains) were determined, in addition to grain yield. It was concluded that inoculation followed by reinoculation in topdressing with R. tropici in co-inoculation with A. brasilense plus Mo/Co, compared to mineral nitrogen fertilization, improves the efficiency of the nodulation process and the morphophysiological characteristics of the common bean crop. Seed inoculation and topdressing application with R. tropici, associated with co-inoculation with A. brasilense + Mo and Co, have the potential to completely replace mineral nitrogen fertilization in common bean crops.
ISSN:2073-4395
2073-4395
DOI:10.3390/agronomy14071368