Water quality of paddy fields for fish culture [Philippines]
1985
Basquinas, G.P.
Paddies applied with chicken manure (treatment 2) gave a significant increase on the orthophosphate and alkalinity values at 5% level of significance. Other water quality variables monitored gave no distinct effects to the different treatments however, most of the water parameters were still within the optimum range for fish production. Paddies applied with inorganic fertilizer plus heterogenous plankton (treatment 3) had the highest mean phytoplankton density and those applied with inorganic fertilizer plus Moina micrura (treatment 4) had the highest mean zooplankton density. Based on the results of the study, highest mean weight grain and recovery were recorded in paddies applied with inorganic fertilizer plus heterogenous plankton (treatment 3). This may be attributed to the additional plankton extensively cultured in fiberglass tanks. Early morning dissolved oxygen in treatment 1 was negatively correlated with phytoplankton abundance (r=-0.25) while zooplankton abundance was positively correlated with dissolved oxygen concentration (r=0.33). Statistical analysis showed no significant relationship between plankton abundance and dissolved oxygen (P0.05). This shows that increase in plankton density in paddies did not cause much effect on dissolved oxygen
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