Research has demonstrated large increases in days of grazing, annual gain, or milk production per acre by fertilizing low yielding pastures. This publication addresses grass pasture fertilization rates, timing, and soil quality, including: types of nitrogen; nitrogen rates, response, and profits; and phosphorous and potassium (P-K) rates for legume-grass pastures.
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Stephen K. Barnhart, Antonio P. Mallarino and John E. Sawyer. "Fertilizing Pasture" (2013)
Available at: http://works.bepress.com/john-sawyer/6/