This study aimed to evaluate the growth and production parameters of cowpea (Vigna unguiculata (L.)) through Phosphate Solubilizing Microorganisms (PSM) associated with vivianite powder used as Rock Phosphate (RP). A randomized complete block design with Sixty (16) treatments (control (no treated plants): C; RKB5 isolate: R0; SSJ7: S0; BNBH2: B0; control with 10 g of vivianite: C10; isolate RKB5 + 10 g vivianite: R10; SSJ7 isolate + 10 g vivianite: S10; BNBH2 isolate + 10 g vivianite : B10; control with 20 g vivianite: C20; RKB5 isolate + 20 g vivianite: R20; SSJ7 isolate + 20 g vivianite: S20; BNBH2 isolate + 20 g vivianite: B20; control with 30 g vivianite: C30; RKB5 isolate + 30 g vivianite: R30; SSJ7 isolate + 30 g vivianite: S30 and BNBH2 isolate + 30 g of vivianite: B30) were used. Each treatment was repeated 20 times and 320 pots were used. The seedling emergence rate, growth (plant height, number of leaves per plant, and leaf area), and production parameters (nodulation and seeds yields) were assessed. Results revealed that S20 fertilizer significantly increased (P <0.05) the dry biomass (23.06 ± 1.97 g) of cowpea plants compared to C20 fertilizer and C plant. The lowest values of studied parameters were from no treated plants. S10 fertilizer increased the plant height by 30.30% compared to BNBH2, SSJ7, and RKB5 fertilizers. Globally, inoculated cowpea plants by S10 fertilizer exhibited the highest seed yields (654.62 ± 19.16 kg/ha). S10 fertilizer increased the cowpea seeds yield by 53.62% and 151.90% respectively compared to C10 fertilizer and no treated plants. According to the results obtained in this study, the combination of SSJ7 isolate + 10 g of vivianite powder per hole is recommended for cowpea grown in Bini-Dang (Adamawa-Cameroon.

Vigna unguiculata, Phosphate Solubilizing Microorganisms, vivianite, yield, growth, Dang (Adamawa, Cameroon).

agronomy

Presentation: poster