Using laterite solution as ferrous supplementing source in water-morning-glory and tilapia culture system

Abstract

The use of laterite solution as ferrous supplementing source in water morning glory and tilapia culture system was carried out by adding the solution at 0.25, 0.5 and 1 ml/L/wk for 3 week. All the 3 levels of the solution added, total ferrous in water (0.03-0.26 mg/L) were significantly (P<0.05) higher than the control (0.00-0.07 mg/L). This affected color leave and production of the plant to be 43.79±6.02, 44.52±2.36, 48.83±4.40 and 19.13±2.58, 20.63±7.69, 21.28±4.92 g/pot, respectively, which were higher than the control (24.43±1.35 and 14.08±2.63 g/pot). The fish in every treatment showed similar growth rate (1.06±0.70-1.52±0.80 g/fish/day) and survival (95.23±4.34-99.05±1.65 %) without any difference. Therefore, the laterite solution could be used as ferrous supplementing source in the system by minimum adding was 0.25 ml/L/wk.