Abstract

• The experiment was conducted in Pyay University Campus, Pyay Township, Bago Region. Water hyacinth, Eichhornia crassipes (Mart.) Solms. is a free floating weed and become a valuable soil improver as composting for crop improvement. In this experiment, the compost was made cow dung, water hyacinth, rice straw mixing at 6: 3: 1. The effectiveness of compost were studied by growing of Vigna radiata L., Pe-di-sein. There were four treatments and each treatment had five replications with Completely Block Design (CRD). Before experiment, the compositions of soil, cow dung, rice straw, water hyacinth and the water hyacinth compost were analyzed. The germination rate of Pe-di-sein was carried out in the mixture of soil and sand medium. The results of vegetative growth of Vigna radiata L. such as the maximum plant height, petiole length, number of leaves per plant, leaf width, leaf length and leaf area were observed from T4 (10 g plant-1). Moreover, T4 (10 g plant-1) gave the biggest reproductive growth like the earliest first flowering days, seeds weight per plant, seed yield, pods weight per plant and pod yield. From above the results of this experiment, water hyacinth compost would be suitable organic soil amendment for soil restoration and crop production and also for yield improvement of legume crop to apply of 10 g plant-1. The utilization of water hyacinth compost resulted in several benefits to cultivars and soil fertility.