This situation allows Crotalaria juncea to decompose faster and release nutrients that maize plants need faster and more results, so that growth and production of plants can take place better.
According to Handayanto (1998) and Stevenson (1982) the speed of decomposition and
mineralization is largely determined by the quality of the organic matter, the concentration of N, lignin and polyphenol concentrations. Besides, fertilizer of N is given will increase biological activity of soil, because the nitrogen content in the soil also affects biological activity of soil.