An experiment was conducted over two years on a Typic Haplaquoll and an Aquic Argiudoll to determine the effect of tillage on the response of two corn hybrids(Zea mays) to soil K fertility. Four tillage systems were used: moldboard plow, chisel plow, disk, and no‐till. The soil K treatments were 336 and 560 kg exchangeable K/ha and 336 kg exchangeable K + 73 kg banded K/ha. Increase in exchangeable soil K increased midseason leaf K each year. Banded K increased leaf K only in the drier year. Tillage affected grain yields only in the growing season with the higher precipitation. The lowest grain yields were obtained with the no‐till system, the highest with the chisel system. Potassium treatment did not affect grain yields. It was concluded that K fertility recommendations developed for moldboard plow systems are adequate for reduced tillage systems.