Industrial pollution of irrigation water and effects of productivity in lowland rice culture (The Case of Agno River Basin) [Philippines]
1988
Castaneda, A.R. | Bhuiyan, S.I. (International Rice Research Inst., Los Banos, Laguna (Philippines). Water Management Dept.)
The Agno river basin [Philippines] suffered yearly from heavy mine tailing pollution. A study was undertaken which analyzed the water quality and evaluated the effects on rice culture in three irrigation systems within the basin for comparative assessment. Results showed that the water quality was suitable for irrigation use by rice crop since actual values of ECw, SAR, and CU as indices for problems of salinity, infiltration and toxicity, respectively, were all within standard values. Suspended sediments (mine tailings) and calcium ions were the only identified pollutants as they exceed the standard. Suspended sediment deposition at farm level caused poor soil fertility and significantly increased copper deposits in soil. Calcium deposition, on the other hand, potentiated the degree of soil water movement inducing high rates of farm water losses. In addition, the suspended sediment inflow into paddy fields (with standing crop at early stage) was detrimental resulting to a lesser number of productive tillers. In both cases, the rice crop was adversely affected, directly or indirectly, resulting to low yields.
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