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Seasonal Yield Distribution of Cool-Season Grasses following Winter Defoliation

Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706-1597 USA

View larger version (69K): [in a new window]   Fig. 1 Field layout of one block in the experimental design: a split plot within a strip plot. Harvest date whole plots (vertical lines) and fertilizer treatment whole plots (horizontal lines), are randomized within the block. Sub-subplots are grasses: 1 = orchardgrass, late; 2 = orchardgrass, early; 3 = quackgrass; 4 = reed canarygrass; 5 = smooth bromegrass; 6 = tall fescue; 7 = timothy. F0 = no N; F168(2) = 67 kg N ha-1 previous August, 101 kg N ha-1 after Cut 1; F168(3) = 67 kg N ha-1 previous August, 45 kg N ha-1 before Cut 1 and 56 kg N ha-1 after Cut 1

View larger version (22K): [in a new window]   Fig. 2 Seasonal yield distribution of cool-season grass on four N treatments at Arlington (ARL) and Lancaster, (LAN), WI, in 1997 and 1998 cut three or four times. Means are averaged over seven grasses, four winter defoliation treatments, and four replicates. F0 = no N; F67(1) = 67 kg N ha-1 previous August; F168(2) = 67 kg N ha-1 previous August, and 101 kg N ha-1 after Cut 1; F168(3) = 67 kg N ha-1 previous August, 45 kg N ha-1 before Cut 1, and 56 kg N ha-1 after Cut 1. LSD(0.05) = 0.09 and 0.13 at Arlington and Lancaster, respectively

View larger version (46K): [in a new window]   Fig. 3 Mean seasonal forage yield of seven cool-season grasses on three N treatments cut three or four times at Arlington and Lancaster in 1997 and 1998. Means are averaged over four winter defoliation treatments and four replicates. 1 = orchardgrass, late; 2 = orchardgrass, early; 3 = quackgrass; 4 = reed canarygrass; 5 = smooth bromegrass; 6 = tall fescue; 7 = timothy. F0 = no N; F168(2) = 67 kg N ha-1 previous August, 101 kg N ha-1 after Cut 1; F168(3) = 67 kg N ha-1 previous August, 45 kg N ha-1 before Cut 1 and 56 kg N ha-1 after Cut 1. LSD(0.05) = 0.25 and 0.17 at Lancaster and Arlington, respectively