Abstract :
Mimosa invisa Mart is one of the types of weeds on crop plantations. M. is a species of woody shrub invisa, blown two, grow upright and bind to the main crops causing a decrease in the quality and quantity of production results (Barus, 2003). In research Jayasree (2006) weed m. Invisa has the capability of competitiveness of major crops, the plant was able to increase the efficiency of 14.08% population in the first year being a 38.55% during the third year. Plant this is invisa m. weed was able to grow quickly in large quantities on a sugar cane plantation acreage. According to Barus (2003) plant Mimosa sp is a weed in the class A, Where its influence on plantation crops was very significant. Weed m. invisa can cause a decrease in the quantity and quality of the harvest as well as the difficulty of the process of harvesting sugar cane in plants. This research aims to know the compounds are secondary metabolites as a allelokimia on rhizosfer plants weeds M. invisa and plant sugar cane (Saccharum officinarum). This research uses qualitative descriptive study rancanagan to know the results of the identification of the compounds are secondary metabolites and allelokimia Weed m. cane plant Invisa. The analysis of samples carried out on 4 rhizosfer areas i.e. weeds, sugarcane, sugar cane and cane-weeds-weed. Compound analysis conducted using the Cromatografy Gass Mass Spektrofotometry (GCMS). The research results showed that every rhizosfer sample analyzed showed a different total metabolite compounds. In addition there are specific compounds belonging to each, rhizosfer weeds have 10 specific compounds, rhizosfer cane 12 specific compounds, weed-specific compounds 11 and cane cane-weed 8 specific compounds. Each Rhizosfer sample found the compound allelokimia dodecane, 2-Furancarboxaldehyde, 5-methyl, Pentadecane and 9-Octadecenoic acid (Z).