2015 年 6 巻 1 号 p. 34-39
Spent wash liquor (or Distillery Slop) is an agro-industrial wastes generated during alcohol distillery production. Its application to the soil for agriculture is highly beneficial due to rich in plant nutrients, organic carbon, less toxic and easily amenable for microorganisms. An advantage is made to direct apply the spent wash liquor as a supplement fertilizer to enhance crop yield in agricultural field. Therefore, long-term effects of spent wash liquor on soil bacterial population in agricultural crop production system is still poorly understood. In this research, the effect of long-term application of spent wash liquor on bacterial decomposers was investigated in sugar cane production systems in Nam Phong watershed. Eight treatments in this research including soil with no spent wash liquor applied (control), soil applied with spent wash liquor for 1, 2, 3, 4, 5, 7, and 8 years were conducted. The results showed that bacterial population at 1 year after application was significantly higher than those from control soil then, the population declined until 8 years after application the population can reach up to 2.04 x 106 CFU/g soil. This study suggested that application of spent wash liquor can affect the bacterial decomposer under sugar cane field. However, the application of spent wash liquor need to be tested in longer time under farmer’s field conditions before further recommendation can be given.
