Soybean yield in the Democratic Republic of Congo (D.R.C.) does not exceed 800 kg/ha. The present study focused on the application of calcium, phosphorus, and potassium to improve growth and yield components.
The experimental cultivar was TGX1830-20, adapted to the edaphoclimatic conditions of the cultivation areas in the southwest and central regions of the D.R.C. The growth and yield components evaluated in this trial were stem thickness and length, number of nodes and pods, and finally seed dry weight. The results obtained show that the application of the three minerals improved all the parameters tested. The application of the three minerals (Ca, K, and P) to the soil made it possible to reach one ton of soybean grain per hectare in the absence of the preferred species Bradyrhizobium japonicum.