Organic vegetables is one of the major sectors of organic agriculture. Organic fertilizers are among the organic means that can supply nutrients to vegetable crops, and improve soil fertility. One of the organic fertilizers is blood meal which is a good source of nitrogen (12#percent#) and phosphorous (2#percent#). The present experiment aimed to study the effect of blood meal on zucchini crop, soil fertility, and to determine the suitable concentrations that can be used. The experiment was conducted in south of Morocco; three concentrations of blood meal were used namely 10kg/ha, 15kg/ha, 20kg/ha. Parameters related to plant growth, soil and vegetative characteristics were collected. Results showed that blood meal increased the crop yield, the number of leaves and the plant height more than in the control. Analyses showed that nitrate and ammonium concentrations in the soil were more available than in the control treatments. The C/N ratio decreased with blood meal application over time.