The present study was carried out at the Experimental Farm, Horticulture Department, Faculty of Agriculture, Suze Canal University during 2008/2009 and 2009/2010. The aim of this work was to study the effect of humic acid, cattle manure at different rates; each alone or in combination on the vegetative growth, flowering, fruit yield and oil in (Carum carvi, L.) plants. Humic acid especially at the highest concentration (60ml/100 liter water) significantly increased the plant height, number of leaves, number of branches, reduced the days to flowering stage as well as increased the essential...