Assessment of lowland rice (NSIC 112) grown in coconut oil mill effluent-affected areas
2010
Abonal, M.V. | Perlas, F.B., Central Bicol State Univ. of Agriculture, Pili, Camarines Sur (Philippines)
An experiment was conducted at Balatas Anayan, Pili, Camarines Sur [Philippines] in order to assess the growth and yield performance of lowland rice (NSIC 112) as influenced by coconut oil mill (COM) effluent at varying distances, to characterize the physical and chemical properties of the soil and water before the experiment, and to compare the return on investment of rice production as influenced by COM effluent as irrigation water on the affected areas in the municipality of Pili, Camarines Sur. A total of 30 plastic pots filled with ten kilograms soil were taken from the affected areas and one from the unaffected area which served as control. The Completely Randomized Design was used involving five treatments replicate six times. The following were the treatments: control (unaffected area), 1.0 kg, 2.0 km, 3.0 kg and 4.0 km downstream from COM effluent affected areas. The chemical characteristics of water samples were within the range of unpolluted water limits. The soils were slightly acidic and with adequate level of CEC. The percent base saturation was deficient in the unaffected area while adequate in the affected areas. The chloride level at 1.0 km and 3.0 kg were low and the rest of the treatments medium. There were no significant differences among treatments in terms of number of days to flowering, number of unproductive tillers and grain weight. However, there were significant differences among treatments in terms of plant height, number of tillers grain yield, and number of filled grains per panicle, percent unfilled grains per panicle, panicle number and harvest index. The correlation analysis between distance and yield was found to be highly significant. The fartehr the distance from the oil mill industry the lower was the yield. The highest return on invesment (ROI) was obtained in the coconut oil mill effluent unaffected area.
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