A pot experiment was conducted to study the effect of arbuscular mycorrhiza, cowdung and phosphorus on red amaranth and Indian spinach in the net house of the Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh. The experiment was laid out in a Completely Randomized Design (CRD) with five replications and 8 treatment combinations comprised of T 1 : Control, T 2 : Arbuscular mycorrhiza (AM), T 3 : Cowdung (CD), T 4 : Phosphorus (P), T 5 : AM + CD, T 6 : CD + P, T 7 : AM + P and T 8 : AM + CD + P. Red amaranth (Amaranthus tricolor L.) cv. BARI Lalshak-1 and Indian spinach (Basella alba) cv. BARI Puishak-1 were used as test crops for the experiment. The experimental results showed that there were significant differences in growth and yield characters such as plant height, plant diameter, number of leaves per plant, shoot fresh and dry weights, root fresh and dry weights of red amaranth and Indian spinach due to the application of arbuscular mycorrhiza (AM), cowdung (CD) and phosphorus (P) independently and combinedly. When arbuscular mycorrhiza, CD and phosphorus were applied combinedly, it exhibited a remarkably higher response in growth and yield of these vegetables.