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An experiment was conducted in south-western coastal saline area of Khulna district of<br />Bangladesh (22&#176;35&#8242;53.463&#8243; N latitude and 89&#176;27&#8242;42.617&#8243; E longitude) during the period from<br />December 2018 to March 2019. The experiment was laid out in two factor Randomized Complete<br />Block (RCB) design with three replications. Factor A included two potato varieties (V1= BARI Alu-<br />72 and V2= BARI Alu-73) and factor B consisted with three rates of rice straw mulch viz. M1= 4 ton<br />ha&#8722;1, M2= 7 ton ha&#8722;1 and M3= 10 ton ha&#8722;1. Average thickness of mulch treatments were 11 cm, 13 cm<br />and 15 cm, respectively. Mulch rate had significant effect on different soil and crop parameters,<br />however there was no significant effect observed in variety and variety vs mulch rate. At harvest,<br />highest plant height (50.7 cm), stem dry weight (1.33 g plant-1) and leaf dry weight (7.29 g plant&#8722;1)<br />were recorded from M3 treatment. In case of yield components and yield, M3 treatment gave<br />highest value for number of tuber per plant (7.11), individual tuber weight (59.38 g), tuber yield<br />(15.62 t ha&#8722;1), haulm yield (2.26 t ha&#8722;1). Significantly highest moisture was conserved by M3 treatment<br />(27.13%) at harvest as well effectively controlled salinity (ECe) increase (only 1.25% increase than<br />initial). So, it is observed that rice straw @ 10 t ha-1 is most suitable for zero tillage potato cultivation<br />in the coastal area of Bangladesh.