Increasing yields in agriculture and management of soil fertility are becoming a major issue in view of the malnutrition problems. Tropical ferralitic soils are phosphorus (P)-deficient. The arbuscular mycorrhizal fungi (AMF) must form symbiotic associations with plants to enhance their hydro-mineral nutrition. The objective of this study was to evaluate the effect of mycorhization on growth of Vigna subterranea. Seedlings of two landraces were inoculated withAMF composite (Gigaspora margarita and Acaulospora tuberculata). P was administered by Hoagland solution (0 and 1000 MP i ). Two months after sowing, plants were harvested. The results show that,with or without phosphate, the number of nodules was three times (p<0.001) higher in mycorrhized plants compared to controls.Phosphate increased (p<0.001) the leaf P-content by 21 and 54% for the control and mycorrhized plants, respectively. Soluble phosphate did not affect the frequency and intensity of mycorhization. Soluble phosphate and mycorhizationsignificantly improve growth and leaf P-content.
Many strains of arbuscular mycorrhizal fungi (AMF) have the ability to improve the water and mineral nutrition of plants and in particular the supply of phosphorus (P). The objective of this study was to determine the influence of mycorrhization and simple superphosphate (SSP) on growth of Voandzou, also called Bambara groundnut (Vigna subterranea (L.) Verdc.). Five SSP doses (0, 30, 60, 90 and 120 mg P 2 O 5 .kg-1 of substrate) were administered on seedlings of two Voandzou landraces inoculated with AMF composite (Gigaspora margarita and Acaulospora tuberculata). Plants were harvested eight weeks after sowing. The results showed that mycorrhization and SSP favored vegetative growth and increased biomass. Thus, the number of leaves of mycorrhized plants was significantly higher than that of control by 5.0%. The highest leaf P-content was observed with 60 mg P 2 O 5 + AMF treatment; but was reduced with 120 mg P 2 O 5 + AMF treatment. Mycorrhizal intensity was highest without SSP. High P levels were observed to reduced mycorrhizal efficiency. However, low SSP doses could be associated with AMF to optimize Voandzou growth. In conclusion, mycorrhization and SSP enhance the growth of Voandzou.
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