Soil Fertility:
Does Soil Fertility Balance Really Affect Forage Quality

Soil:
KOW Consulting Association's Soil Fertility Guidelines for Dairy Quality Forage

June/July 2006:
Are My Crops Getting All the Nutrients They Need?

(For optimum yield, quality and dairy nutrition)

Manure:
KOW Consulting Association's Manure Management Guidelines

Fertilizer:
KOW Consulting's Recommended Fertilizer Sources

Blended Fertilizer:
KOW Consulting Association's

Blended fertilizer options/recipes for low P&K soils

Feed Ingredients as Fertilizer?
The more transportation costs, the more quality and use efficiency matters
Mineral Nutrition and Plant Disease:
Here's a book review for you.