Apply 2 pounds of 10-10-10 per 100 feet of row after planting and an additional 2 pounds in late August. Day-neutral varieties should receive a more constant nitrogen rate through the planting year. Apply 1 pound of ammonium nitrate per 100 feet of row once a month from June through the first day of September. Strawberry size can be increased dramatically by timely irrigation as the berry enlarges. Avoid overwatering since too much water will dilute the flavor of the berry, giving it a bland, unappealing taste.