Organic Corn – Oats/Alfalfa – Alfalfa: This system is managed according to the USDA’s National Organic Program Standards. Fertility is derived from the application of dairy manure, weed control is achieved via tillage, and organically certified top yielding corn hybrids and organically certified leaf hopper resistant alfalfa varieties are planted. Typically two forage harvests occur during the alfalfa seeding year and between three and four during the production year of the alfalfa phase of the rotation.