Why Is Rainfall Better Than Irrigation? Bowls, Cricket, Golf, Irrigation, Racing, Sportsfield, Summer It’s not always there when you need it, but rainfall typically results in more even soil moisture, greater turf health and improved growth rates. After a significant rain event during a dry summer, many turfgrass practitioners will... To access this post, you must purchase NZSTI Membership - Full Advisory or NZSTI Membership - Standard.