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ABSTRACT
An experiment was replicated simultaneously at two sites of floodplain soils of Bangladesh to find out the optimum application rate of zinc and boron fertilizers for crops under cauliflower-maize-transplant aus rice pattern. Randomized complete block design with three replications was used in the experimentation. The first crop of the pattern received four zinc levels (0, 2.0, 4.0, and 6.0 kg ha−1), and three boron levels (0, 1.5, and 3.0 kg ha−1). In second crop, two additional treatments receiving 2.0 kg Zn ha−1 and 2.0 kg Zn ha−1 + 1.5 B ha−1 were added; in the third crop, another four treatments were added by further application of 2 kg Zn ha−1 in each. Other nutrients viz. N, P, K, and S were used equally at recommended rates for all plots. In such a 3-crop pattern, application of 4.0 kg Zn ha−1 and 1.5 kg B ha−1 at a time to the first crop or 2.0 kg Zn ha−1 to each of the first two crops along with 1.5 kg B ha−1 to the first crop was sufficient to achieve satisfactory yield of the crops. Considering system productivity, nutrient uptake, and protein and Zn concentrations of crops, the aforesaid doses were found promising.