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Effects of Phosphorus and Potassium on Forage Nutritive Value and Quantity

Environmental Implications

^a Univ. of Florida, IFAS, RCREC, 3401 Experiment Station, Ona, FL 33865
^b Univ. of Florida, IFAS, GCREC, 5007 60th Street East, Bradenton, FL 34203

View larger version (45K): [in a new window]   Fig. 1. The effects of various fertilizer treatments on total dry matter (DM) yield of stargrass in 1998, 1999, and 2000. Total DM yields in a specific year with letters in common are not significantly different (P > 0.05). Minimum significant differences (MSD) are 0.415, 0.466, and 0.639 for years 1998, 1999, and 2000, respectively.

View larger version (33K): [in a new window]   Fig. 2. The groundcover of stargrass as affected by various combinations of P and K application rates to episodic freezing during the winter of 2001. The groundcover of the grass with letters in common are not significantly different (P > 0.05).

View larger version (12K): [in a new window]   Fig. 3. The relationship between tissue K concentrations and groundcover of stargrass (% green grass cover of the total) to occasional freeze spell at the end of the study (i.e., during the winter of 2001).