I am a little confused here - your pattern requires you to just do one row in stockinette stitch? But in a stockinette stitch, you need to knit one row and then purl the next. It goes like:
row 1: knit all stitches
row 2: purl all stitches
row 3: knit all stitches
row 4: purl all stitches and so on
So, all you should have to do is follow this pattern and create a stockinette patch in the middle of the knit stitches. Here
you can find out more about the stockinette stitch technique.