In a lowland rice field, under controlled (cement tank) and uncontrolled (earthen tank) water situations the uptake of Fe by rice was two times higher under rice-cum-fish culture than in rice alone. Uptake of N by rice recorded 10% increase when fish was reared in the field in association with paddy. However, concentration and uptake of K, Ca, Mg and Mn did not show any definite trend.
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