Study effect of vermicompost and biochar on growth, yield and water use efficiency ‎of eggplant (Solanum melongena L.) in field condition

In order to investigate effect of two kinds of biochars (date palm and pistachio biochars) on yield and water use efficiency of eggplant in field condition a factorial experiment based on randomized complete block design in three replications was carried out. The first factor was vermicompost in two levels (0 and 1500 g/m2) and the second factor was biochar in three levels (0, 500 g /m2 date palm and 500 g/m2 pistachio biochar). Results showed that the highest fresh and dry weight of aerial and root was obtained in the combination treatment of vermicompost and date palm biochar. The highest amount of chlorophyle a and b belonged to vermicompost treatment. The effect of biochar and interaction effect of vermicompost and biochar on fruit number per plant was significant. The highest fruit number per plant was obtained in application of vermicompost and date palm biochar. Application of vermicompost lead to the highest mean fruit weight. The highest total yield (7233 g/ plant) and water use efficiency (11.16 kg/m3) was observed in combination treatment of vermicompost and date palm biochar.