OREGON STATE UNIVERSITY
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Little, if any, fertilizer nitrogen is needed by legume seed crops. Measure soil pH, phosphorus, potassium, and boron with a soil test to determine need. Red Clover requires a soil pH above 6.0. Annually apply sulfur before mid-March with other nutrients, if they are needed.
Soil Acidity in Oregon: Understanding and Using Concepts for Crop Production, EM 9061
Applying Lime to Raise Soil pH for Crop Production (Western Oregon), EM 9057
Red Clover Western Oregon Fertilizer Guide
Crimson Clover, Vetch, Field Peas Western Oregon Fertilizer Guide