The experiment consisted of two factors based on Split Plot Design with 3 replications. The main plot of crotalaria green manure treatments consisted of two levels i.e: without green manure (B0) and the use of crotalaria green manure as many as 10 tons ha-1(B1). A subplot consisted of 3 levels i.e: without fertilization (P0), fertilization with a dose of 67.5 kg N ha-1 + 33 kg P2O5 ha-1 (P1) and fertilization with a dose of 135 kg N ha-1 + 66 kg P2O5 ha-1 (P2 ).
The experiment was conducted in the following ways: the land used in the experiment was divided into three blocks. Each block was divided into 2 main plots, then the main plot was divided into three subplots with 5 x 2.5 m. The planting of maize was done with a spacing of 70 cm x 25 cm. Urea and SP-36 was done in accordance with provision of treatment. The weeding was done manually at the age of 20 and 40 days after planting maize. The parameters observed in this study included: plant biomass, leaf chlorophyl content, cob length, cob diameter, cob weight, and dry shelled production per ha.