Utilization of paper mulberry pulping waste water and distillery slop as sources of potassium for rice grown on Sansai soil series

First part was carried out in the laboratory. The results of experiments conducted in the laboratory showed that the paper mulberry pulping waste water was extreamely alkaline having pH 11.4, it contained high potassium content of 7,480 mg/l, high electrical conductivity and low in other plant nutrients. For, distillery slop, it was very strongly acid and high in potassium of 16,345 mg/l and was also high in nitrogen, calcium, magnesium and sodium. For the Sansai soil, it was moderately acid, low in organic matter contents and low in exchangable potassium of 40 mg/kg but high in available phosphorus. Application of paper mulberry pulping waste water and distillery slop into Sansai soil significantly increased the available potassium content in the soil. The releases of potassium from the Sansai soil either incubated with paper mulberry pulping waste water or potassium chloride fertilizer at any rate were similar. However, Sansai soil incubated with any rate of distillery slop released equally highest potassium content. The second part was performed in pot. For the pot experiment using paper mulberry pulping waste water as source of potassium for Suphan Bori 1 rice variety grown on Sansai soil series showed that growth, yield and total potassium uptake of rice increased significantly. The effectiveness of paper mulberry pulping waste water and distillery slop on increasing growth, yield and total potassium uptake of rice were similar. However, the growth, yield and total potassium uptake of rice were the highest with KCl fertilizer when comparerd with those of paper mulberry pulping waste water and distillery slop. Utilization of paper mulberry pulping waste water and distillery slop did not change soil pH and EC in all stages of rice growth. Therefore, paper mulberry pulping waste water and distillery slop could be used as potassium fertilizer for rice growth in Sansai soil series or other soil series having the same properties as Sansai soil series.