And there are statistical differences in growth from the study showed that cowpea varieties NO. 13 has the potential in the accumulation of nitrogen, 10.1 g / kg. Followed by cowpea varieties NO. 13 has potential in the accumulation of nitrogen, 10.0 g / kg and breed CP4-3-2-1 potential in the accumulation of nitrogen. To 9.9 g / kg and cowpea varieties CP4-3-2-1 have total nitrogen (Total N) up to 0.42 compared to before planting). And it is also one of the guidelines to add nutrients to the soil increased the plug completely to soil And to reduce the cost of chemical fertilizer.