Corn – Alfalfa – Alfalfa – Alfalfa: This system is representative of a high input, high yielding dairy forage rotation. Fertility is derived primarily from the application of dairy manure, weed control is achieved via herbicides, and top yielding corn hybrids and alfalfa varieties with advanced genetic traits are planted. Typically two forage harvests occur during the alfalfa seeding year and between three and four during the production years of the alfalfa phase of the rotation.