Sentence:  Another even more effective method is to heavily douse the area with common grocery store vinegar (white or apple cider), and then cover it with plastic and <WSD>solarize</WSD> it for two weeks. If after two weeks you still have problems, apply more vinegar and <WSD>solarize</WSD> for the rest of the summer and try again next year. Remember to clean the land before you <WSD>solarize</WSD>. 
Meaning of the word marked with <WSD> tags:  To treat soil by covering with plastic and exposing to sunlight.