Hi Wambua,
Which kind of vegetables do you intend to plant? This is because they will have different nutrient requirement.
Its important to do a soil test to analyse the nutrients available and recommend on fertilizer program.
However a fertilizer rich in phosphorus is important for root development e.g DAP, nitrogenous fertilizer during vegetative stage e.g CAN, Urea and Potassic fertilizer during fruit formation e.g potassium sulphate.