If manure is being applied to the wheat stubble, cover crop seed can be drilled, or we have seen good cereal rye stands when seed is spread after the manure application and incorporated with shallow vertical tillage or is slurry seeded with the manure. The picture shows a cereal rye stand just two and a half weeks after planted during a field demonstration using slurry seeding or vertical tillage to incorporate the manure and seed. Both slurry seeding with an incorporation attachment or shallow incorporation with a low disturbance tillage tool can reduce ammonia emission, however emissions may not be reduced as much as it would with a more aggressive incorporation method.
There are several cover crops that can provide a harvestable crop. If forage is short, consider a cover crop that can be gazed or harvested. Sorghum-sudangrass, oats, cereal rye, annual ryegrass and winter triticale all have forage value.
It is not recommended to leave the wheat ground idle from July to the following April. Growing crops provide a food source for soil organisms as well as trap any nutrients in the root profile for use in future crops. Idle ground can also be a place where weeds can establish, grow and produce seed, creating problems for the next crops.
Look at wheat ground as an opportunity to improve that field for the future.