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The nutritional benefits of fertilization on Ozark forest range for the late spring and summer period are questionable. Fertilizer application did not enhance either protein or calcium content, but did increase phosphorus. Acid detergent fiber (ADF) increased on fertilized plots while in vitro dry matter digestibility (IVDMD) decreased. An interaction between harvest date and fertilizer treatment revealed higher IVDMD for fertilized plots in May, but the relation then reversed for the remainder of the study. Harvest date proved to be the most influential treatment in the study. The changes associated with harvest date reflect the normal phenological development of tall fescue. The forage becomes less nutritious and less digestible as it approaches maturity and dormancy in July and August. Aspect significantly influenced ADF content and IVDMD. ADF content was lower and IVDMD higher on southfacing slopes. Fertilization of tall fescue (Festuca arundinacea Schreb.) on Ozark forest range increases production (Ehrenreich and Buttery 1960; Halls and Crawford 1963; and Crawford and Bjugstad 1967); but the influence on forage quality and digestibility is unknown. Pasture research on the same species or similar species in different areas has yielded considerable information on these factors. For example, Blaser (1964) noted increased carrying capacity under fertilization; however, individual animal output generally did not improve. He concluded that fertilization caused no appreciable difference in total digestible nutrients. Raymond (1969), in reviewing several papers on fertilizer and forage digestibility, drew a similar conclusion. Martz, et al. ( 1967), working on orchardgrass in central Missouri, found results comparable to those of Blaser and Raymond. Kaiser (197 l), during a 2-year study in southern Indiana, found no significant relationship between fertilizer application and in vitro dry matter digestibility in the first year of his study. During the second year, he found that fertilizer significantly increased IVDMD. Similar information is not available, but it is needed for large areas of the Ozarks in southern Missouri which are being converted to tall fescue grassland. This study was designed to measure the influence of fertilizer on the chemical constituents and digestibility of tall fescue. The effects of harvest date and aspect were also determined.

Influence of Fertilizer, Aspect, and Harvest Date on Chemical Constituents and in vitro Digestibility of Tall Fescue