“MINE TAILINGS: THEIR EFFECTS ON RICE RC-28”


PAULE, Sr. Maria D. , AMP Unpublished Masteral Thesis, University of Nueva Caceres , City of Naga , 2002.

Keywords: Mine Tailings Effect on Rice Growth & Yield

This study evaluated the effects of mine tailing on the growth and yield of Rice RC-28. Specifically, it sought answers to the following questions: 1) what are the physical and chemical properties of the soil with and without mine tailing? 2) What are the effects of mine tailings on the growth and yield of Rice RC- 28 along these levels of concentrations: 25%, 50%, 75% and 100% mine tailings? 3) Is there a significant difference between the effects of the control and experimental set-up?

The experimental method was the main approach used in answering the questions raised in the study. Samples of soil with and without mine tailings were analyzed as their physical and chemical properties using four exposure levels of concentration of mine tailings. Rice RC-28 was grown in a time frame of three months and eighteen days to observe the growth and yield of Rice RC-28. The change in height for each growth stage was observed and recorded as well as grain yield.

Major conclusion were: 1) The rice grown in the soil without mine tailings had a higher productivity compared with the grown in the soil with mine tailings. 2) The chemical properties indicated the low PH of both soil with and without mine tailings but due to the higher percentage of organic matter and base saturation, the soil without mine tailings had more capacity to provide the necessary nutrients. 3) The effect of the varied levels of concentrations was clearly manifested by the decrease in height at different growth stages and in the decrease of the grain yield, as the level of concentration of mine tailings increased, its adverse effect intensified a the rice grew till it reached the harvesting stage; or, the higher the concentration of mine tailings, the slower was the growth of Rice RC-28 and the lower the yield. 4) Of the four levels of concentration of mine tailings had a very strong effect on the growth of Rice RC-28 from panicle initiation till harvesting stage; the 75% level of concentration of mine tailings had moderate effect during the panicle initiation and a strong effect from flowering till harvesting stage and a strong effect during the harvesting stage; and 25% level concentration of mine tailings had no significant effect in the early stages except in the harvesting stage.
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