A study was conducted to evaluate different doses of Zn and B along with their application schedule for the component crops in potato-rice-rice pattern in floodplain soil. The experimental layout was Randomized Complete Block Design with 3 replications. As treatment, zinc and boron were applied to the component crops of the pattern in different distributions so that their direct, residual and cumulative effects could be estimated. Other nutrients i.e., 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 found sufficient to achieve satisfactory yield, system productivity, nutrient uptake by crops, and protein and Zn concentrations of crop produce. Zinc and boron containing fertilizers need not to apply in each of the component crops of a cropping pattern potato-rice-rice in floodplain soil. Each fourth crop is essential to be fertilized with 4.0 kg Zn ha −1 and 1.5 kg B ha −1 .