With mid-July plantings, and where herbicide carryover issues are not a concern, summer annual sorghum-type forages are also a good double crop option.
A test plot planted July 21 near Holton in 2008, when summer rainfall was very favorable, provided yields of 2.5 to 3 tons dry matter/acre for hybrid pearl millet and Sudan grass at the low end to 4 to 5 tons dry matter/acre for forage sorghum, BMR forage sorghum, photoperiod sensitive forage sorghum, and sorghum x Sudan grass hybrids.
Earlier plantings may be able to produce even more tonnage, as long as there is adequate August rainfall. One challenge with late-planted summer annual forages is getting them to dry down when harvest is delayed until mid- to late-September. Wrapping bales or bagging to make silage are good ways to deal with the higher moisture forage this late in the year
— Ryan Flaming is a Kansas State Research and Extension Agent for Harvey County. Agriculture is his specialty. The Harvey County Extension Office can be contacted at 284-6930.