The values listed under each month in Table 1 are the averages of ratings made on three replicated plots for the three studies. Yearly means of data from each month are listed in the last column. The cultivars are listed in descending order of average quality. Notice that the first 77 cultivars received mean ratings of 6 or above for the 1997 season. There is now a wide selection of high-quality perennial ryegrass varieties to choose from for this region.
Perennial ryegrass is quite susceptible to winter damage.
There was no winter damage in the spring of 1997. Last year's report contains information on the effect of winter damage. The 1997 quality and other ratings for the national perennial ryegrass study established in 1994.