Iowa Code Title XI. Natural Resources [Chs. 455-485] § 459.313. Manure application--rules

1. The department shall adopt rules governing the application of manure originating from an anaerobic lagoon or aerobic structure which is part of a confinement feeding operation. The rules shall establish application rates and practices to minimize groundwater or surface water pollution resulting from application, including pollution caused by runoff or other manure flow resulting from precipitation events. The rules shall establish different application rates and practices based on the water holding capacity of the soil at the time of application.

2. A person shall not apply manure by spray irrigation equipment, except as provided by rules adopted by the department pursuant to chapter 17A. However, a person shall not use restricted spray irrigation equipment to apply manure originating from a confinement feeding operation, unless the manure has been diluted as provided by rules adopted by the department, including diluted by use of an anaerobic lagoon.