Our study aimed at assessing the effects of 3 Plants Growth Promoting Rhizobacteria (PGPR) either singly or in combination on maize growth under laboratory and greenhouse conditions. Seeds were inoculated with single and combined solution of 108 CFU/ml of Rhizobacteria. Seeds were not inoculated for the control variant. The highest germination percentage was obtained with the combination of Pseudomonas fluorescens and Pseudomonas putida. This combination also recorded the best vigor index, plants circumferences number of leaves and the leaf area. The maximal heights of plants were observed with seeds treated with Azospirillum lipoferum with an increase of 37.32%. The highest rates of underground dry matter were recorded with A. lipoferum, with an increase of more than 56% comparative to control, while the combination P. fluorescens and P. putida increased the aerial dry matter of 59.11%. Finally, the highest value of the aerial biomass was obtained with the plants treated with the combination of P. fluorescens and P. putida and the highest underground biomass was obtained with plants treated only with A. lipoferum. These results s...
Tel ; (+229)97123468 RESUME L'objectif de cette étude est de caractériser les rhizobactéries potentiellement promotrices de la croissance végétative ou encore en anglais « plant growth promoting rhizobacteria» (PGPR) vivant dans la rhizosphère de douze (12) différentes zones agroécologiques du sud-Bénin. Un échantillon composite de sol et de racines des plants de maïs est prélevé au niveau de 4 différents champs de producteurs par zone agroécologique. Des analyses agrochimiques et microbiologiques sont faites sur ces échantillons. Les résultats montrent que la flore totale des sols étudiés est riche en rhizobactéries. Quinze (15) espèces de PGPR différentes sont identifiées à de fortes concentrations dans tous les échantillons de sols et de racines. Il s'agit de trois espèces de Pseudomonas, trois espèces de Streptomyces, huit espèces de Bacillus et une espèce de Azospirillium. Les sols du sud-Bénin contiennent naturellement des rhizobactéries potentiellement promotrices de croissance végétative. Il ne se dégage pas de lien entre les propriétés chimiques des sols des différentes zones d'étude et la distribution des rhizobactéries PGPR.
Effets des rhizobactéries PGPR sur le rendement et les teneurs en macroéléments du maïs sur sol ferralitique non dégradé au Sud-Bénin
The application of Plant Growth Promoting rhizobacteria as a microbial bio-fertilizers to increase soil fertility and productivity, allows a rational use of chemical fertilizers which makes agriculture sustainable. The aim of this study was to evaluate the effects of the rhizobacteria Pseudomonas putida on the maize productivity in farmer environment. For this purpose, trials were conducted in two Agricultural Development Poles with nine (09) producers equitably distributed in Southern, Central and Northern Benin. The experimental design was a completely randomized block of three (03) treatments (T1: farmer practice; T2: P. putida + ½ recommended dose of NPK and Urea; T3: recommended dose of NPK and Urea) with three (03) repetitions. During sowing, two (2) maize seeds of the 2000 SYNEE-W variety were introduced into a pot and inoculated with 10 ml of bacterial suspensions of 108 CFU/ml concentration. The results showed that the best heights, stem diameters and leaf areas of maize plants were obtained with P. putida + ½ recommended dose of NPK and Urea with the nine (09) producers of the three (03) areas with respective increases of 14.76%; 18.08% and 26.56% compared to the farmer practice. In addition, the results related to yield parameters such as aerial biomass, underground biomass and maize grain yield were better improved with the P. putida + ½ recommended dose of NPK and Urea. The average rates of increase recorded were 42.70%, 38.96% and 77.69%, respectively, compared to farmer practice. In sum, this rhizobacteria can be used as the microbial bio-fertilizers to improve maize productivity in Benin.
Aims: One of the alternatives proposed to improve the sustainability and productivity of agricultural systems is the use of organic fertilizers based on arbuscular mycorrhizal fungi. The objective of the study was to evaluate the effectiveness of the native mycorrhizal fungus Rhizophagus intraradices in the field at Ouenou in North Benin for improved maize (Zea mays L.) production. Study Design: The experimental design was a complete random block of three treatments. Mention the design of the study here. Place and Duration of Study: Endomycorrhizal infection was assessed on roots of corn plants at 78 days post-seed. Methodology: Corn variety 2000 SYN EE-W was inoculated with the strain in combination with the mineral fertilizer (NPK) half-dose. Results: Results showed that of the three treatments, the highest heights were observed in plants treated with Rhizophagus intraradices +½ dose of NPK (15:15:15) and urea. The same observations were made with respect to leaf number and leaf area of plants and grain yield. Regarding the endomycorrhizal infection of plants inoculated with Rhizophagus intraradices +½ dose of NPK (15:15:15) and urea, of the three producers, the observation was that the endomycorrhizal infection was elevated to the level of the second producer (P2) which was of the order of (50%) while the mycorrhizal intensity was lower (24.6%) in the same producer. Conclusion: The native mycorrhizal fungus R. intraradices plus the half-dose NPK plus urea, had a positive impact on most of the various parameters.
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