A 2-year study (2015, 2016) was conducted at 2 sites (Marshfield, Hancock) in central Wisconsin to assess yield and quality of photoperiod sensitive (PS) and non-PS sorghums in relation to corn planted on 2 dates and harvested once or twice. At each site, treatments were arranged in a split-split plot in a randomized complete block with 4 replications. Main plots of planting date (early or mid-June) were randomized within block. Subplots of harvest strategy (harvested once or twice) were randomized within planting date. Within harvest strategy, 8 forages were assigned (corn, PS sorghum, PS sorghum-sudangrass, sorghum, brown midrib (BMR) sorghum, sorghum-sudangrass, BMR sorghum-sudangrass, or PS-BMR sudangrass). Multi-harvests occurred in mid-summer and fall, and single harvest was based on maturity or after a frost. Data were analyzed using the Mixed model of SAS. Single harvest plots had greater yields than multi-harvest (18,961 vs 9,970 kg DM/ha; P < 0.01), a site by harvest interaction (P < 0.01) suggested 2 harvests were more similar to 1 harvest at Marshfield than Hancock. Yields were greater at Hancock than at Marshfield (16,562 vs 12,370 kg DM/ha; P < 0.01) and were greater in 2016 than 2015 (18,262 vs 10,669 kg DM/ha; P < 0.01). The early June planting had greater yields than mid-June (15,320 vs 13,612 kg DM/ha; P = 0.02). There was a harvest x variety (Table 1; P < 0.01) interaction; single harvest PS varieties and non-PS sorghum-sudangrass yielded more than BMR varieties, corn and forage sorghum were intermediate. Sorghum-sudangrass and sudangrass had more similar yields using either 1 or 2 harvests than other varieties. Overall, sorghum can provide high yields of moderate quality forage. Table 1. DM yields (kg/ha) for sorghums and corn using single or multiple harvests at Hancock and Marshfield in 2015 and 2016

Forage1	Harvest
	Single	Multi
Corn	17,551	5,159
PS forage sorghum	23,606	9,024
PS sorghum-sudan	25,218	13,850
Forage sorghum	18,054	10,677
Sorghum-sudan	21,067	14,412
BMR forage sorghum2	16,372	8,128
BMR sorghum-sudan	14,964	9,206
PS BMR sudangrass	14,857	9,307
SEM	1,038
Variety × harvest (P-value)	<0.01

¹PS = photoperiod sensitive; BMR = brown midrib.