Abstract
ABSTRACTSoil micronutrients have different degrees of residual effect to crops; again crops differ in their sensitivity to micronutrient requirement. Evaluation of residual effects of micronutrient application to cauliflower, okra, and transplant aman rice in a pattern was studied in piedmont soil of Bangladesh. In this study, seven treatment combinations including a control treatment were tested, and the treatments were designed taking the micronutrients following the additive element trial technique. The rates of micronutrients were 3 kg zinc (Zn), 2 kg boron (B), 2 kg Cu, 3 kg manganese (Mn), 5 kg iron (Fe), and 1 kg molybdenum (Mo) per hectare. Both Zn and B were found responsive for the first crop. As second crop, okra responded to both residual Zn and B, whereas in the third crop, residual effects of only Zn were reported. Zn fertilizer need not to apply in each crop of a cropping pattern.
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