An investigation was carried out at College of Agriculture, Vellayani during 2010–2012 to develop a promising liquid manure for vegetable production. Organic liquid manures and extracts of different organic manures were analysed for nutrient content. The results of the study revealed that extracts of solid manures and liquid manures as individual sources registered low nutrient content while, the extracts of composite manure preparations registered high nutrient content. Among the combinations, the extracts of composite manure prepared by mixing groundnut cake, neem cake and poultry manure (in 1:0.5:0.5 ratio), groundnut cake, vermicompost and poultry manure (in 1:0.5:0.5 ratio), and groundnut cake and poultry manure (in 1:1 ratio) recorded high nitrogen content and also evaluated the keeping quality and shelf life of organic liquid manures. The results of the study revealed that the shelf life of promising organic liquid manure could be improved by bringing the pH to slightly acidic condition (6 -6.5) by the addition of lime. Autoclaving helped to remove the foul smell of liquid manures without causing any reduction in nutrient content.