Effect of Atrazine Herbicide toward Population of Bacteria and Fungi in some Sugarcane Soil types
D. Sasongko

Indonesian Sugar Research Institute
E-mail : isri@telkom.net

ABSTRACT

The effect of atrazine herbicide on population of bacteria and fungi in rizosphere soil was studied in glass house with sugarcane susceptible and tolerant varieties and in the laboratory with petridish containing some 0, 5, 10, 20 and 40 ppm of atrazine. These studied was done at Indonesian Sugar Research Institute in some soil types (Vertizol, Entizol and Ultizol). The result showed that population of bacteria in sugarcane rizosphere was increase at 30 days after planting (dap) and the population still increase until 60 dap in Vertizol, Entizol and Ultizol soil. Only population of fungi was increase in Entizol soil at 30 dap and at 60 dap the population was decrease in all soil types. Application of atrazine dose 6.0 kg/ha at 30 days after spraying (das) was affect on decreases population of bacteria more than 80% toward population at 15 das in sugarcane rizosphere of susceptible variety but not affect in sugarcane rizosphere of tolerant variety. At 30 das, population of fungi in sugarcane rizosphere (susceptible and tolerant varieties) was decrease more than 50% toward population at 15 das in three soil types. Laboratory studied showed that 5 ppm of atrazine (equal dose 7,5 kg/ha) or more, population of bacteria and fungi in Vertizol, Entizol and Ultizol soils was affected.
Key words : atrazine, sugarcane rizosphere, bacteria, fungi.
(Indonesian Sugar Research Journal Vol.42,No.1-2, Maret-Juni 2006)