Daily harrowing of rain-filled ponds in Bangladesh with a weighted rope (hora) was observed to have significant effects on turbidity levels, but no significant effects on pond water nutrient or chlorophyll-a values. Harrowing was also found to have no significant effects on pond soil nutrient levels or fish growth and production. Transitory effects on sediment gas release and on stratification were observed.
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Beveridge et al. (1994) studied this question.