Investigation Effect of Different Level of Vermicompost and Manure on Seed Yield and Its Components of Cowpea (Vigna unguiculata L.)

BACKGROUND: Suitable and useful usage of different kind of fertilizers and biofertilizer is the main way for reformation and potential of soil fertility and increasing of crops yield. OBJECTIVES: This research was carried out to evaluate effect of different level of vermicompost and several amount of cow manure on crop production of Cowpea. METHODS: The current study was conducted according factorial experiment based on randomized complete blocks design with three replications along 2015 year. The first factor included three level of Vermicompost (V1: nonuse of vermicompost or Control, V2: 2 t.ha-1, V3: 4 t.ha-1) and second factor consisted three level of cow manure (M1: nonuse of cow manure or Control, M2: 10 t.ha-1, M3: 15 t.ha-1). RESULT: Result of analysis of variance revealed effect of vermicompost, cow manure and interaction effect of treatments on all measured traits (instead harvest index at 5%) was significant at 1% probability level. Mean comparison result of different level of vermicompost indicated that maximum amount of all measured traits was noted for 4 t.ha-1 vermicompost and minimum of those belonged to control treatment. Also as for Duncan classification made with respect to different level of cow manure maximum and minimum amount of all measured characteristics belonged to 15 t.ha-1 and control. Evaluation mean comparison result of interaction effect of treatments indicated maximum amount of seed yield (415.36 gr.m-2), biologic yield (865.6 gr.m-2), number of pod per plant (13), number of seed per pod (14), 100-seed weight (25.3 gr) and harvest index (46.54%) was noted for 4 t.ha-1 vermicompost and 15 t.ha-1 cow manure and lowest ones belonged to control. CONCLUSION: Finally according results of this study, treatments of 4 t.ha-1 of vermicompost mixed with 15 t.ha-1 of animal manure led to achieve highest amount of seed yield and its components, and can be advised to producers.