Nutrient Dynamic of Vermicompost Tea after Adding Molasses and Oxygen

抄録

Nowadays, organic agriculture has become an important activity for control of soil pollution and degradation. The use of organic manures and bio fertilizers are important practices in the field of agriculture. Vermicompost tea is a liquid organic bio fertilizer. Vermicompost tea is composed of plant nutrient, plant hormone and microorganism. However, during storage of the vermicompost tea, its quality could change, hence improving the quality of vermicompost tea is important. The aim of the study was to investigate the changes of quality of vermicompost tea after molasses and oxygen addition. The vermicompost tea used in this study came from the Eudrilus eugeniae composting worms, fed with vegetable, soil, cow manure, and ashes of 4:3:2:1 ratio. Experiment design was factorial 4*2 in completely randomized design with three replications. Factor A was different rate of molasses (0%, 0.5%, 2.5% and 5.0%). Factor B was oxygen and non-oxygen. After 3 days, the results showed that there was an interaction of pH, EC, total nitrogen and total phosphate content but no interaction of total potassium content between 2 factors. Nutrient content (total nitrogen, total phosphorus and total potassium) and electrical conductivity (EC) were significantly increased at higher rates of molasses but pH was decreased (P < 0.01). The addition of oxygen, pH, EC and total potassium content was increased while total nitrogen and total phosphorus were decreased. Therefore, the quality improvement of vermicompost-tea can be achieved by adding molasses.