BACKGROUND: Salicylic acid (SA) is a small molecule phenolic substance and secondary metabolite, which is commonly found in different plants. Abscisic acid (ABA), one of the five recognized plant hormones.OBJECTIVES: The purpose of this research was to investigate the most effective abscisic acid to salicylic acid ratio at different growth stages and its influence on crop production and qualitative trait of Cowpea.METHODS: Current study was conducted in the summer of 2016 in Shahid Salemi farm according factorial experiment based on randomized complete block design with 3 replications. This experiment included different ratios of abscisic acid to salicylic acid at 3 levels [including no use (control), 1.5:2 and 3:4 Mm/(mg/g)] and also included three of foliar application in different periods of growth [1-Before 30 days (slow growth period) 2- Flowering time 3- Pod appearance].RESULT: The difference between the different ratios of abscisic acid to salicylic acid in terms of pod length, number of pods per plant, number of seeds per pod, 1000 seed weight, seed yield, biological yield, harvest index and protein percentage were statistically significant at the 1% of probability level. The difference between the levels of different periods of foliar application in all measured traits was significant at the 1% of probability level. The interaction effects of treatments on seed yield and biological yield was significant at the 1% of probability level and pod length and the number of pods per plant at the 5% of probability level. The highest seed yield, with an average of 2859 kg.ha-1, was related to the ratio of 1.5:2 abscisic acid to salicylic acid during vegetative growth, and the lowest (with an average of 1035 kg.ha-1) was related to the ratio of 3:4 hormones and foliar application at the pod appearance stage.CONCLUSION: According to the obtained results, it is recommended to apply the ratio of 3:4 abscisic acids to salicylic acid during vegetative growth to increase both quantitative and qualitative yield. پرونده مقاله