If there is no rain within a week, I turn the sprinklers on, at night, and let them run for six to eight hours. There is immediate growth of the plants. Since our coldest weather doesn't arrive until December, I have six weeks or longer of growing time left. Keep in mind that pure nitrate of soda is deadly in heat, and do not let it touch the plants. Some plants just take longer to get started.
Daylilies do love nitrogen, but remember that it does make for taller scapes and more robust growth.
Composts Composts are simply the finest soil builders that can be used - and usually the cost is low. Daylilies are heavy feeders, so use enough compost to supply plenty of nutrients. Provide the best method of building soil. All manures are excellent. Horse manure is perhaps best because it breaks down well in winter.